Building Fabric Performance beyond simple U-values - Xtratherm
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Building Fabric Performance beyond simple U-values Giving building professionals the highest level of support from design stage to delivery of real performance on site through the assurance of a validation process from calculation to installation. www.xtratherm.com
02 Building Fabric Performance beyond simple U-values
The Benefits Developers and their design
Consultation Service with and certification teams can
project dedicated Xtratherm
Technical expert. rely on the expertise and
Warranted U-value
calculation under BBA/ professional support of
TIMSA Scheme.
Fabric performance
Xtratherm - it is not just about
specifications to achieve
FEEs standard fabric. buying insulation products.
Pre-design assessment of
details & Y-value performance. The Platinum Service gives building professionals the highest level of
support from design stage to delivery of real performance on site through
Off plan SAP Calculation the assurance of a validation process from calculation to installation.
consultation service.*
For further information and to register for the Platinum Service:
Guaranteed prompt
response – all project sizes. Xtratherm.com/platinum_uk
Personal consultation and
access to on-line training The Platinum Service is available to Architects and Developers
for installer.
on domestic development sites where Xi roof or floor solutions
* In association with project Energy Assessor are specified along with an Xi wall system.
www.xtratherm.com 03
Building Fabric
Performance
beyond simple
U-values
The Xtratherm Xi range of insulation CavityTherm
delivers not only excellent U-values Passive Performance
but enhanced thermal bridging Built-in Cavity System
detailing; all performances are
CavityTherm is a built-in
backed by 3rd party certified insulation system that achieves
an unbeatable U-value of
calculations and product certification, 0.12 W/m2K within traditional
delivering not just performance but wall cavity width of 150mm,
surpassing passive targets.
assurances you can rely on.
Passive Performance Engineered
Partial Fill Cavity System T&G Floor Insulation
XtroWall is an innovative Xtratherm Engineered to provide accurate
partial fill wall insulation system dimensions and assured insulation
with robust facings, engineered continuity, the T&G jointing provides
jointing T&G detailing, preformed a robust solution when insulating
corners and a certified lambda floors to Passive levels.
of 0.021 W/mK.
Sarking Pitched Roof
Passive Performance - Passive Performance
Warm Roof Sarking Insulation Pitched Roof Insulation
An advanced Warm Roof system Using Xtratherm XO/PR on sloped roof areas
of XtroLiner Sarking insulation that can provide the most efficient U-values with
delivers the passive U-value target minimal intrusion into valuable living space.
of 0.15 W/m²K in a single layer, Warm Roof construction is a particularly
avoiding thermal bridging and effective way of insulating complex roofs.
allowing for more effective Insulating above and between the roof
membrane detailing. timbers ensures that the structure is kept
at, or near the internal environmental
conditions, reducing thermal stress
and condensation risk.
04 Building Fabric Performance beyond simple U-values
Why the Building to the 2013 regulation standards,
Code for Sustainable Homes or looking
Xi Range? towards Zero Carbon?
Fabric Energy It’s not just about
Efficiency Standard simple U-values
In 2009, based on extensive R&D and Insulation performance
collaboration with the industry, the Zero is no longer about simple
Carbon Hub made initial proposals for a U-values. How insulation
Fabric Energy Efficiency Standard (FEES). interconnects with other elements and
This Standard was developed to support junctions in the design is critical. The aim
the development of Building Regulations is to achieve a continuous thermal layer
AD L1A, 2016. FEES is now incorporated that minimises heat loss at those junctions.
into the Code for Sustainable Homes and This is thermal bridging and is measured
Part L 2013 has introduced the ‘Fabric 2013 Part L Regulations. and accounted for as a Y-value
Energy Efficiency Standard’ (FEES) into
within SAP calculation.
the Building Regulations. FEES had
already been incorporated into The Code
for Sustainable Homes back in 2010 and
SAP reports would have quoted a FEES
score as part of the results from the 2009
version. So FEES is not a completely
new concept but one that clarifies what
builders, designers and manufacturers
need to do to achieve low/zero carbon
fabric designs in terms of U-values,
detailing and air tightness for 2016-2020.
A ‘Recipe’ for compliance has been
written within Table 4 of Part L, offering
a specification for compliance, where a
wall U-value of 0.18 W/m2K is suggested.
www.xtratherm.com 05
The Technical Achieving Fabric Energy Efficiency Standards
Building to 2013 standards, Code level 4 or
Solution 5 or looking towards 2016 and Zero Carbon
within traditional construction, the Xi range
with enhanced detailing will get you there!
Achieved U-values FEES Targets (Conducted in a range of dwelling types)
Element U-values (W/m²k) U-value Unit (W/m²k)
Walls 0.14 Walls 0.15 - 0.18 W/m2K
Roofs 0.12 Roofs 0.13 W/m2K
Floors 0.15 Floors 0.13 - 0.15 W/m2K
Windows 1.20 Windows 1.2 - 1.4 W/m2K
Doors 1.50 Doors 1.0 - 1.4 W/m2K
Thermal Bridging Y=0.05 Thermal Bridging 0.04 - 0.07 W/m2K
Air Permeability 5m³/hr/m² Air Permeability 5.0 - 5.2 m3/hr/m2@50Pa
Practical, The Xi Range has been designed
to deliver passive performance
Affordable within traditional build methods.
Solutions to Maintaining the traditional ‘look’ and feel of In the publication issued by the Zero Carbon
Low Energy our dwellings, using locally sourced materials
and built by a skilled local workforce benefits
Hub, ‘Defining a Fabric Energy Efficiency
Standard for zero carbon homes Appendix D
both the environment and local communities. Cost analysis’, the cost involved in increasing
Fabric Keeping a reasonable wall cavity width of
150mm whilst achieving U-values of around
a wall cavity from 85mm to 210mm added an
additional £2,570.00 to a typical semi-
0.13 W/m²K provides a practical and detached and £4,512.00 to a detached
affordable solution to achieving excellent property. To increase a cavity out to 200mm
fabric performance. There are also cost on the semi-detached property could add up
implications that must be considered when to £28.25 per square metre of external wall
designing a cavity over 150mm. area - before actual insulation costs are
considered.
A Total The Xtratherm Xi range provides the
most cost effective answer to not only
Insulation reaching Zero Carbon U-values, but
Solution also achieving Thermal Bridging targets.
Insulation performance is not about simple design is critical. The aim is to achieve a
U-values. How that insulation interconnects continuous thermal layer that minimises
with other elements and junctions in the heat loss at junctions.
06 Building Fabric Performance beyond simple U-values
Accredited Like all other inputs into a building
energy calculation, the way that
Detailing insulation is installed to avoid thermal
bridging has a numerical input into the
software which is called a Y-value.
A set of ‘good practice’ details have Where does
been available in the form of ‘Accredited
Non-Repeating occur?
Construction Details for Part L’ (ACDs)
published by the Department for Non-repeating thermal bridges typically
Communities and Local Government occur at the junctions between plane
(DCLG) in the UK. These details are a set building elements, e.g. at wall / roof,
of design drawings for the junctions listed wall / floor junctions, and around openings,
in Appendix K Table K1 in the SAP 2012 e.g. at window jambs, sills and also
Manual which are most prone to heat loss. corners where the continuity of the
They detail, using traditionally used UK nsulation is interrupted.
construction methods and materials how
insulation should be installed at these How is it accounted for?
critical junctions in order to improve not y = 0.15 (SAP Default)
Thermal bridges are calculated as a linear The equivalent of an open ‘Garage
only the heat loss but also airtightness
thermal transmittance value -PSI (Ψ) Door’ 2.1m x 3.3m (6.93m2) opening.
results and avoid condensation by
measured in W/mK. SAP is the software
ensuring surface temperatures are that is used to calculate a dwellings EPC
within a safe margin. rating, within SAP Thermal bridging through
junctions are accounted for as a ‘Y-value.’
What is Thermal Bridging?
Thermal bridging occurs in small areas Are all junctions
where the insulation level is reduced accounted for within SAP?
significantly compared with the remainder
of the element. They may be ‘Repeating,’ No. The major critical junctions are those
‘Random,’ or ‘Non-Repeating.’ that account for the majority of the heat
loss. However reasonable care should
be taken to insulate all bridges that
occur on-site to avoid condensation.
y = 0.08 (Accredited Details)
The equivalent of an open ‘Patio Door’
2.1m x 1.8m (3.78m2) opening.
y = 0.03 (Thermally Modelled Junctions)
For full CAD details and thermal bridging certificates The equivalent of an open ‘Window’
specifically for UK constructions visit: www.xtratherm.com 1.25m x 1.25m (1.56m2) opening.
www.xtratherm.com 07
Thermal A major factor in the performance of
the building fabric is not simply the
Bridging amount of insulation you install, but how
it interconnects with other components
and the other insulated elements within
the design.
Building junctions, where building elements
meet such as at corners or reveals, are less
Semi-Detached House - TER 18.24
well insulated than the main element. With
Xtratherm Accredited Details insulation
Total Envelope Area = 190.580
continuity is assured.
It has been estimated that up to 30% of the Which details to use? Accredited Xtrathem
heatloss in a well insulated house is through Junction Detail Length (m) Ψ (W/m K) 2
Ψ (W/m2K)
these ‘Non Repeating Thermal Bridges’ at Lintels 13.970 0.30 0.03
wall / floor junctions, corners, reveals, ceiling
Sills 12.170 0.04 0.04
junctions, heads and sills etc, building
regulations ask that this heatloss is Jamb 29.550 0.05 0.02
measured and minimised. Ground Floor 19.600 0.16 0.05
Intermediate Floor 19.600 0.07 0.00
As with every element/component within
Corner (normal) 20.400 0.09 0.04
the energy strategy of a building design,
U-values, air tightness, boiler efficiency Corner (inverted) 10.200 - 0.09 - 0.06
etc, this ‘Continuity’ of insulation at the Ceiling (insulation at eases) 11.000 0.06 0.05
junctions has a numerical value within the
Ceiling (insulation at gables) 8.900 0.24 0.05
SAP calculation tool – it’s called the ‘Y’
value. From 2010 the Y-value must now Party Ground Floor 8.900 0.04 0.04
be calculated by the building designer, Party Wall (imtermediate floor) 8.900 0.00 0.00
with a target of around 0.04 achieving the Party Ceiling (insulation at ceiling) 8.900 0.06 0.05
Fabric Energy Efficiency Standards for Zero
Total L x Y 15.27 4.48
Carbon and the higher levels of the Code
for Sustainable Homes. Y-Value (L x Y / total area) 0.08 * 0.02
*Ψ Based on Lightweight Block
Xtratherm has published a full set of accredited PSI values based on
the DCLGs Accredited Details for Construction. Using these figures
will allow most properties to use the Y-value of better than 0.05
which is targeted under FEES.
How the insulation system builds within
a construction, how it interconnects at
junctions and how it is witnessed and
confirmed on site is of equal importance as
U-values, indeed better U-value should not
be used UNLESS detailing is improved
to match those levels. With the Xtratherm Xi
range of products a ‘system’ is certified to
deliver better building performance.
08 Building Fabric Performance beyond simple U-values
Walls - Built-in Cavity
CavityTherm Passive Performance
®
Built-in Cavity System
CavityTherm is an innovative built-in insulation for traditional walls that achieves
Passive level U-values as low as 0.12 W/m2K with excellent thermal bridging detailing
in cavities less than 150mm wide. Maintaining a reasonable cavity width dispenses
with the requirement for an engineers report for cavities over 150mm. The engineered
solution with pre-formed corner boards, riser pieces for below DPCs and panels to
insulate around cavity trays and vents build to form a continuous insulation system.
The enhanced features of the Advanced Engineered Detailing
Xi range delivers enhanced thermal
Excellent Thermal Bridging Y-value
bridging detailing and resultant PSI
values, all performances are backed Robust facings
by 3rd party certified calculations
and certification, delivering not just 0.12 W/m²K U-value in 150mm cavity
performance but assurances
you can rely on. Certified performance and calculations
CavityTherm Performance See the Performance Build Refer to NBS clause F30 155, F30 12. To
be installed in accordance with instructions
Xtratherm CavityTherm wall insulation The great advantage of built-in insulation
issued by Xtratherm UK Ltd as part of the
board is a high performance composite board is that you can actually see installation is done
Platinum Service validation process.
of PIR core with a lambda value of 0.021 W/mK. correctly. CavityTherm was used on the AIMC4
The boards have gas tight facings with one
face bonded to a profiled HIPS skin during
project that succeeded in achieving Passive
standards – under constant scrutiny
CavityTherm
manufacture to provide a drainage plane. for installation accuracy and was tested post
Xtratherm PSI Values*
CavityTherms’ unique profiled facing completion – CavityTherm delivered. Using Accredited Details
directs any moisture that might have penetrated
the external wall down the protective facing The Accredited Details are a set of standard Accredited Details Block Type PSI
and back onto the external leaf. The board details that have been developed to indicate
includes specifically designed rebated edge insulation best practice in the UK, these E5-MCI-GF-01 (Floor) Medium 0.064
detailing on all four edges to allow the system should be followed on site to ensure you get E5-MCI-GF-01 (Floor) Lightweight 0.019
to tightly interlock when installed. the performance you’ve paid for (Contact us
for a copy). With CavityTherm being built- E2-MCI-WD-02 (Lintel) Medium 0.022
Insulation Performance in you can see the performance, and your
E2-MCI-WD-02 (Lintel) Lightweight 0.024
investment, build.
CavityTherm Performance E4-MCI-WD-05 (Jamb) Medium 0.018
The new CavityTherm wall insulation system Specification E4-MCI-WD-05 (Jamb) Lightweight 0.019
works within a traditional cavity wall using
The built in wall insulation system shall
traditional foundations, building skills and E3-MCI-WD-04 (Sill) Medium 0.032
be _ _ _mm CavityTherm manufactured
materials to achieve U-values as low as
to BS EN 13165 by Xtratherm, including E3-MCI-WD-04 (Sill) Lightweight 0.033
0.12 W/m2K (at 150mm). Maintaining the
corner boards and ancillary detail
standard overall wall width means no loss E16-XT-CRN-01 (Ext Crn) Medium 0.048
components comprising of CFC/HCFC
of living space internally nor an enlarged
free engineered jointed rigid Polyisocyanurate E16-XT-CRN-01 (Ext Crn) Lightweight 0.039
building footprint. The new CavityTherm
(PIR) with a lamba value of 0.021 W/mK
insulation system is suitable for all housing E17-XT-CRN-02 (Int Crn) Medium -0.074
with heavy low emissivity foil facings and
types in mixed developments up to 25m in
engineered outer skin to achieve a U-value E17-XT-CRN-02 (Int Crn) Lightweight -0.067
height and allows for most external wall finishes
of_ _ _W/m2K for the wall element.
to satisfy planning requirements.
* Using 100mm CavityTherm. Psi values for other thicknesses
can be requested from our technical department.
www.xtratherm.com 09
U-values Wall Ties & CavityTherm Property & Units
Wall ties play a significant part in the overall
CavityTherm (Inner block 100) Water Vapour Resistivity >100 (MNs/gm)
U-value performance of a wall. Maintaining
Block Type 100mm 125mm 150mm an overall cavity width no greater than 150mm Thermal Conductivity 0.021 (W/mK)
allows traditional S/S wire ties to be used on
Light 0.17 0.14 0.12 the wall. Wider cavities will necessitate larger Service Temperature -20 to +100 (ºC)
wall ties that will have a detrimental effect on
Med 0.19 0.15 0.13
the U-value and increase the point thermal
bridging or chi value of each tie, cavities over
CavityTherm CT/PIR
Dense 0.19 0.16 0.13
150mm also require full engineers report for Length (mm) 1200
Plaster Finish
the construction. CavityTherm is held in position
by the outer layer of the wall, however, Width (mm) 450
tolerances in the build or materials might result
Thickness (mm) 100 125 150
in a gap, in this instance retaining clips should
be used to hold the CavityTherm tight to the Typical R-value* 4.52 5.71 6.90
inner skin.
*PIR only
Masonry should be designed and constructed
to the guidance given in Eurocode 6 EN 1996
1-2 and S.R 325.
CavityTherm Slots should be cut into the sloped surface
Installation
of the boards to allow the ties to run down
Guidelines
Install the first row of CavityTherm supported
towards the outer leaf. A section of the
by at least 2 wall ties per board, allowing for
internal leaf should be built up to a course
an overlap with the floor insulation of a minimum
above the next row of wall ties and ensuring
150mm. Starting at an external corner,
that the wall is level and free of any
the boards should be installed with the lap
protrusions, repeat the installation process,
upper most and the profiled face outwards with
ensuring boards are kept free from mortar.
boards interlocked and continued towards
The use of a cavity board is recommended
the adjacent junction or reveal opening. Boards
during construction. All boards should be
should be cut as they butt the adjacent corner,
tightly interlocked with vertical joints
in the event that cutting should occur mid wall
staggered. Continue the installation to total
the facings should be overlapped and sealed
wall height or if truncated, protect by an
with weather proof tape. Wall ties conforming
approved cavity tray, installed to
to BS EN 845-1: 2013 & Eurocode 6 - should
manufacturers recommendations.
be used. and placed at approx 600mm centres,
Cavitytherm is suitable for walls up to 25m
do not place directly on the DPC. The type and
in height. Where openings such as doors
spacing of wall ties is dependent on geographical
and windows are in close proximity, it is
area, cavity width, wall length and height, and
recommended that a continuous lintel or
opening sizes. They should be placed at centres
cavity tray is used. Damp-proofing at lintel
recommended by manufacturers to suit the wall
level must be provided with stopends and
specification and placed within the pre-formed
weep holes. Internal and external corners
notches of the CavityTherm. should be protected with DPC.
For full procedures refer to literature and
relevant Agrément Certification.
Quality Management Systems
Environmental Management
OHSAS 18001 Occupational Health & Safety
10 Building Fabric Performance beyond simple U-values
Walls - Partial Fill
Passive Performance
Partial Fill Cavity System
XtroWall is an innovative Xtratherm partial fill wall insulation system with robust facings,
engineered jointing details, preformed corners and a certified lambda of 0.021 W/mK. When
built to the accredited details in a 150mm cavity, XtroWall achieves a Passive U-value of
0.15 W/m²K. The XtroWall accessory pieces such as riser pieces for below DPCs and panels
to insulate around cavity trays and vents build to form a continuous insulation system that
delivers excellent thermal bridging Y-values.
The enhanced features of the Class ‘O’ Modified PIR
Xi range delivers enhanced thermal
Thermal Conductivity 0.021 W/mK
bridging detailing and resultant PSI
values, all performances are backed HCFC/CFC Free Zero ODP
by 3rd party certified calculations
Class ‘O’/Low Risk Fire Rating
and certification, delivering not just
performance but assurances For New Build or Refurbishment
you can rely on.
Partial Fill Cavity Insulation Insulation Value Xtratherm PSI Values*
Using Accredited Details
XtroWall Partial Fill Cavity Wall insulation is the XtroWall Partial Fill Cavity Wall insulation
solution of choice to achieve the lower U-values is a rigid modified polyisocyanurate (PIR) Accredited Details Block Type PSI
asked for under the building regulations whilst insulation with low emissivity foil facings
E5-MCI-GF-01 (Floor) Medium 0.062
maintaining a residual cavity as a protection having a thermal conductivity of 0.021 W/mK.
from wind driven rain. Masonry walls are the E5-MCI-GF-01 (Floor) Lightweight 0.019
predominant construction method. The high Specification Clause E2-MCI-WD-02 (Lintel) Medium 0.029
performance to thickness ratio of XtroLiner The Partial Fill Cavity Wall insulation shall be E2-MCI-WD-02 (Lintel) Lightweight 0.031
allows for excellent U-values to be achieved XtroWall manufactured to BS EN ISO 9001:
within traditional constructions without E4-MCI-WD-05 (Jamb) Medium 0.024
2000 by Xtratherm, comprising a CFC/HCFC
increasing dramatically the overall width free Class ‘O’ rigid modified Polyisocyanurate E4-MCI-WD-05 (Jamb) Lightweight 0.026
of the wall. Using XtroWall allows the residual (PIR) with textured low emissivity foil facings. E3-MCI-WD-04 (Sill) Medium 0.036
cavity to be maintained, providing an effective The XtroWall_ _ _mm to achieve a U-value
E3-MCI-WD-04 (Sill) Lightweight 0.038
method of preventing moisture ingression. of_ _ _W/m2K for the wall element. To be
installed in accordance with instructions E16-XT-CRN-01 (Ext Crn) Medium 0.050
XtroWall comes with optional pre-formed corner issued by Xtratherm UK Ltd. as part of the E16-XT-CRN-01 (Ext Crn) Lightweight 0.041
pieces and detailing accessories such as Platinum Service validation process. Refer to E17-XT-CRN-02 (Int Crn) Medium -0.082
insulated periscope vent pieces and stepped NBS clause F30 155, F30 12.
cavity insulated formers to ensure continuity E17-XT-CRN-02 (Int Crn) Lightweight -0.074
of the insulation layer and achieve excellent * Using 75mm XtroWall. Psi values for other thicknesses
thermal bridging detailing. can be requested from our technical department.
U-values Achieved W/m2K
Between Rafter Dense Medium Lightweight
Below Rafter 75mm 0.21 0.20 0.19
100mm 0.17 0.16 0.15www.xtratherm.com 11
Residual Cavity Property & Units
A Residual cavity is the air space retained
Compressive Strength >125 (kPa)
when partial fill cavity wall insulation is placed
within the cavity of a wall. This cavity has Water Vapour Resistivity >100 (MNs/gm)
been the traditional barrier to protect UK
buildings from what has become an ever Thermal Conductivity 0.021 (W/mK)
increasing occurrence of wind driven rain. For Service Temperature -20 to +100 (ºC)
wall heights up to 25m a minimum 50mm
residual cavity is recommended.
XtroWall (T&G)
Wall Ties Length (mm) 1200
The insulation should be secured to the outer
face of the inner leaf by a retaining clip on Width (mm) 450
approved double drip type stainless steel
Thickness (mm) 50 60 70 75 100 (T&G)
wall ties that conform to BS EN 845-1:2003.
Typical R-value 2.28 2.86 3.33 3.57 4.76
Cavity Wall
Installation
are sloped towards outer leaf. A cavity
board should be used to keep cavity
Guidelines
Insert wall ties max 600mm CS one block clean. Form XtroLiner boards to
course below DPC. Secure cavity boards insulate reveal openings to provide
tight against inner leaf with retaining clip on robust detailing.
approved stainless steel wall ties.
Lower U-values can be achieved with
the addition of an internal lining of Xtratherm
Maintain a 50mm residual cavity to suit all XT/TL on adhesive dabs or timber battens.
exposure zones. Ensure a minimum 50mm
residual cavity is maintained. This may
have to be increased to suit conditions.
(e.g. NHBC) Place wall ties at max
900 x 450 centres; each board secured
with a minimum of 3 wall ties.
Ensure block joints are fully bonded with
unbroken mortar. Fix wall ties 225mm
vertically and 150mm horizontally
from face of unbonded jambs.
Ensure wall ties (cavity) are
kept clean of mortar and
Quality Management Systems
Environmental Management
OHSAS 18001 Occupational Health & Safety12 Building Fabric Performance beyond simple U-values
Floors - Solid / Screed
Hyfloor Engineered
T&G Floor Insulation
Engineered to provide accurate dimensions and assured
insulation continuity, the T&G jointing provides a robust
solution when insulating floors to Passive levels.
The enhanced features of the High Thermal Performance
Xi range delivers enhanced thermal
Certified Thermal Conductivity
bridging detailing and resultant PSI as low as 0.022 W/mK
values, all performances are backed
by 3rd party certified calculations Robust Engineered Jointing
and certification, delivering not just HCFC/CFC free, GWPwww.xtratherm.com 13
Engineered to provide accurate dimensions Property & Units
and assured insulation continuity, the T&G Compressive Strength >140 (kPa)
jointing provides a robust solution when Water Vapour Resistivity >100 (MNs/gm)
insulating floors to Passive levels. Thermal Conductivity 0.022 (W/mK)
Service Temperature -20 to +100 (ºC)
High Compressive Strength
Achieves Zero Carbon Standards Hyfloor XT/HYF
Thicknesses to tie in with brick coursing Length (mm) 2400
T&G jointing on all four edges Width (mm) 1200
Extra thermal performance Thickness (mm) 75 100 125 140
Branded boards Typical R-value 3.41 4.54 5.68 6.36
NB. When layering boards, ensure board edges are staggered.
Below Floor Slab Below Floor Screed
Installation
Where Hyfloor Insulation is used below (Solid or Suspended)
Guidelines
the floor slab, lay the hardcore in layers; min Hyfloor Insulation can be used below the
150mm max 225mm; each layer should be floor screed. The same procedure should
well compacted, with the surface blinded with be followed ensuring that the floor slab or
quarry dust or sand to provide suitable surface beams onto which the insulation is being
for laying DPM. A damp proof membrane laid is level, a blinding of sand may be
e.g. 1200 gauge polythene or radon barrier required. The concrete floor over which the
should be laid over blinding with joints taped insulation is to be laid should be left as long
to prevent passage of ground moisture, it as possible to maximise drying out, in
should be carried up the wall until it meets and accordance with BS8203: 1996 Section
seals with the DPC. Lay the Hyfloor boards 3.1.2. The minimum thickness of sand
in staggered jointed pattern. Closely join all and cement screed is 65mm for domestic
edges. Place Xtratherm floor upstand around construction and 75mm for most other
floor perimeter to provide Acceptable Detail. buildings. However, architectural
Seal around any service penetrations. Layer a specifications should be consulted.
polythene seperating layer over the insulation
with 150mm lap joints. Lay concrete slab
to the correct thickness.
Quality Management Systems
Environmental Management
OHSAS 18001 Occupational Health & Safety14 Building Fabric Performance beyond simple U-values
Roofs - Sarking / Warm Roof
Sarking Single Layer Roof System
to achieve 0.15W/m2k
XtroLiner XO/SK is an engineered external roof insulation system to
meet a U-value of 0.15 W/m2K and achieve improved thermal bridging
and air tightness detailing in a single layer solution for warm pitched roofs.
The enhanced features of the Advanced Engineered Detailing
Xi range delivers enhanced thermal
Improved precision
bridging detailing and resultant PSI
values, all performances are backed Excellent Thermal Bridging Y-value
by 3rd party certified calculations
Robust facings
and certification, delivering not just
performance but assurances 0.15 U-value in single layer
you can rely on.
Sarking Performance Specification Sarking
Using XtroLiner XO/SK on sloped roofs The Xi pitched roof Sarking insulation shall be
U-values Achieved W/m2K
provides Passive level U-values in a single layer Xtratherm XtroLiner XO/SK with engineered
applied over the rafter, improving detailing, T&G jointing manufactured to BS EN 13165 Over Rafter Between Rafter
speeding installation and providing a uniform by Xtratherm, comprising a CFC/HCFC free
rigid Polyisocyanurate (PIR) core between low 0.15W/m2K 125mm —
plane to detail more effectively.
emissivity foil facings. The XO/SK_ _ _mm 0.11W/m2K 100mm 100mm
Insulation Performance with lambda value 0.021 W/mK to achieve
a U-value of _ _ _W/m2K for the roof element. 0.14W/m2K 75mm 75mm
Warm Roof construction is a particularly
effective way of insulating roofs as detailing Refer to NBS clause P10 140, K11 695, K11 55.
along the rafter plane aids thermal bridging To be installed in accordance with instructions
and air tightness detailing at difficult junctions issued by Xtratherm UK Ltd as part of the
incurred when insulating traditionally from the Platinum Service validation process.
under side in dormer style roofs. The XtroLiner
XO/SK is a robust T&G jointed board that has
been engineered to improve precision in
1 Vapour permeable membrane may
applications, improve thermal bridging detailing be placed over the insulation or over the
and avoid the U-value penalty applicable tiling battens, check with the relevant
to square edged boards. agrément certification.
2 The robust T&G jointing of Xtratherm
Sarking avoids the U-value penalties
applicable to Square Edged insulation.
1
2
For areas of insulated ceiling, the addition of Xtratherm
Thermal Liner XT/TL below 2 layers for 150mm mineral fibre
achieves a U-value of 0.12 W/m2K and improves the resultant
PSI values at wall and gable junctions.www.xtratherm.com 15
Fixings Property & Units
Treated counterbattens are fixed through the
Compressive Strength >150 (kPa)
insulation into the rafter with Helifix Inskew
(or other approved) fixings at the appropriate Water Vapour Resistivity >100 (MNs/gm)
centres, taking account of the specific roof
design e.g. pitch, weight of slates/tiles and Thermal Conductivity 0.021 (W/mK)
location of the building etc - contact supplier Service Temperature -20 to +100 (ºC)
for specification /calculations. A vapour
permeable roof tile underlay should be installed
(fully supported or over the counterbattens) XtroLiner XO/SK
depending on the type and in accordance
Length (mm) 2400
with the membrane certification.
Width (mm) 1200
Thickness (mm) 75 100 125
Typical R-value 3.57 4.76 5.95
Sarking for specification /calculations. A vapour
permeable roof tile underlay should be
A treated timber stop rail, the same thickness
installed (fully supported or over the
as the XtroLiner Sarking Insulation, is fixed
Installation
counterbattens) depending on the type
to the rafters close to the eaves to provide a
and in accordance with the certification.
Guidelines
firm fixing point for the counter battens. A vapour
Using the underlay over the counter
control layer should be applied either directly
battens ensures better thermal performance
over the rafters or to the underside. The
from the Xtratherm insulation.
XtroLiner Sarking boards are laid over the
rafters commencing at the stop rail, the Tongued Additional Layers
and Grooved edges of the boards should XtroLiner Sarking roof insulation can
be fully engaged and positioned in a staggered be used to create a double layer system
pattern over the rafters. Repeat the procedure when the U-value requirement creates
using crawling boards until the entire area from an excessive thickness for a single layer
eaves to ridge has been covered. The insulation application, or overall thickness needs
will not support operatives. Any gaps in the to be reduced at the eaves detail. Ideally
insulation (e.g. at the eaves, ridge, valleys and the thicknesses between and over the
around any roof lights etc.) must be sealed with rafters should be of similar depth and
flexible sealant or expanding foam. Accredited a vapour control layer installed on the
Detailing must be followed. Use large headed warm side of the insulation. For full
clout nails to hold boards temporarily in place procedures refer to literature and relevant
until they are secured by the counter battens. Agrément Certification.
Treated counterbattens are fixed through the
insulation into the rafter with Helifix Inskew
(or other approved) fixings at the appropriate
centres, taking account of the specific roof
design e.g. pitch, weight of slates / tiles and
location of the building etc - contact supplier
Quality Management Systems
Environmental Management
OHSAS 18001 Occupational Health & Safety16 Building Fabric Performance beyond simple U-values
Roofs - Sloped Rafters
Pitched Roof Passive Performance
Pitched Roof Insulation
Our XtroLiner XO range of modified PIR offers excellent insulation performance with
thermal conductivity of 0.021 W/mK and a Class ‘O’ fire rating. XtroLiner is CFC & HCFC
free and is manufactured under the highest standards of ISO 9001 and 14001 Quality
and Environmental Management Systems. The XtroLiner board has a core of modified
polyisocyanurate (PIR) bonded to low emissivity textured aluminium foil facings.
The enhanced features of the Class ‘O’ Modified PIR
Xi range delivers enhanced thermal
Thermal Conductivity 0.021 W/mK
bridging detailing and resultant PSI
values, all performances are backed HCFC/CFC Free Zone ODP
by 3rd party certified calculations
Class ‘O’ Low Risk Fire Rating
and certification, delivering not just
performance but assurances For New Build or Refurbishment
you can rely on.
Pitched Roof Performance The high performance to thickness ratio of Specification
XtroLiner gives the maximum insulation values
Using XtroLiner XO/PR on sloped roof The Xi Pitched Roof insulation shall be Xtratherm
with minimal intrusion into the living area
areas can provide the most efficient U-values XtroLiner XO/PR manufactured to BS EN
below. The Hybrid Roof follows the same
with minimal intrusion into valuable living space. 13165 by Xtratherm, comprising of CFC /
construction as the Ventilated Roof - but an
Warm Roof construction is a particularly HCFC free Class ‘O’ rigid modified
approved Vapour Permeable Underlay is
effective way of insulating complex roofs. polyisocyanurate (PIR) with textured low
used above the rafter allowing the 50mm
Insulating above and between the roof timbers emissivity foil facings. The XO/PR_ _ _mm
ventilation space to be dispensed with.
ensures that the structure is kept at, or near to achieve a U-value of_ _ _W/m2K for the
the internal environmental conditions, reducing roof element.
A 25mm unvented void should be maintained.
thermal stress and condensation risk. In a ceiling, typically fibre glass is placed between Refer to NBS clause P10 140, K11 695, K11
and over the joists - this hides the top of the 55. To be installed in accordance with
Insulation Performance joist and may lead to health and safety concerns instructions issued by Xtratherm UK Ltd as
Placing XtroLiner between and / or below the when the roof space is being accessed. part of the Platinum Service validation
rafter creates a Ventilated Roof. A continuous An Xtratherm solution to insulate the thermal process.
50mm ventilation space is required between bridge through the joists is to place a layer of
the insulation and the roof tile underlay to allow XtroLiner to the underside of the joist before Pitched Roof
any moisture to be vented out of the construction. the plasterboard is fixed. This allows for the
(May be reduced depending on breather roof space to be accessed in a safe manner
U-values Achieved W/m2K
membrane certification). leaving the top of the joists exposed, allowing
the roof space to be used for storage. Between Rafter 100mm 125mm 150mm
Below Rafter 40mm 0.17 0.15 0.15
50mm 0.16 0.14 0.14
75mm 0.13 0.12 0.12www.xtratherm.com 17
Ventilated Roof Property & Units
Allow for ventilation gaps normally 50mm.
Compressive Strength >150 (kPa)
(May be reduced depending on breather
membrane certification). Water Vapour Resistivity >100 (MNs/gm)
Cut XtroLiner boards to fit tightly between
Thermal Conductivity 0.021 (W/mK)
rafters flush with rafter bottom.
An additional 2nd layer should be added Service Temperature -20 to +100 (ºC)
to the underside of the rafter.
Run second layer transverse to the first. XtroLiner XO/PR
Temporarily fix with nails.
Length (mm) 2400
Provide vapour control layer
(Aluminium tape joints). Width (mm) 1200
Finish with 12.5mm plasterboard Thickness (mm) 40 50 75 100 125 150
fixed with drylining screws.
Typical R-value 1.90 2.38 3.57 4.76 5.95 7.14
Screw fix every 150mm, 12mm from
edge of boards.
All board edges should be supported.
Warm Roof
Installation
Fix counter batten with approved fixings.
Ventilation may have to be provided
Guidelines
Ensure cavity wall insulation has continued
subject to certification. A second layer
to roof height to engage with roof insulation.
of insulation may be added between
Fix a timber stop rail to end of rafter at eaves.
the rafters. Provide a vapour control layer
Lay XtroLiner XO/PR insulation stagger jointed
to the underside of the construction.
over rafters ensuring joints are supported by
Current Building Regulations/Standards
rafters. Ensure boards are tightly butted fill any
should be considered with regard to the
gaps with expanding foam. A vapour
requirements for and /or provision
permeable underlay should be fitted;
of fire stops.
refer to manufacturers Agrèment
certification. Providing an unvented
void under the membrane can improve
the thermal performance.
Quality Management Systems
Environmental Management
OHSAS 18001 Occupational Health & Safety18 Building Fabric Performance beyond simple U-values
CavityTherm
®
Full Fill Built-in Insulation System
CavityTherm is an
innovative built-in insulation The complete
system for traditional walls cavity wall system
that achieves passive level CavityTherm provides
a full range of innovative
accessories forming
U-values as low as 0.12 a continuous ‘system’
that delivers unbeatable
W/m²K and excellent thermal bridging detailing.
thermal bridging detailing
in cavities less than
It’s not just
150mm wide. about U-Values
CavityTherm wall insulation
board delivers not only
The board includes specifically designed rebated edge passive U-Values but also
the detailing to combat
detailing on all four edges to allow the system to tightly thermal bridging heat loss.
interlock when installed. This engineered jointing of the
insulation layer, with the addition of bespoke ancillary
pieces to insulate effectively around services such as
hockey sticks, meter boxes and corner details,
ensures continuity and results in excellent
thermal bridging detailing.
Built-in protection
CavityTherms unique engineered profiled facing directs from wind driven rain
any moisture that might penetrate the external wall down
CavityTherm has an
the protective facing and back onto the external leaf, inbuilt profiled HIPS
giving added protection from wind driven rain. skin that provides
a drainage plane
as protection from
wind driven rain.
cavitytherm.comwww.xtratherm.com 19
Closing the
Performance Gap
Delivering performance on site, There are a number of issues is available at our headquarters in
that insulation manufacturers Derbyshire to aid in the delivery of
as intended by design, has were asked to address to close upskilling of industry professionals
been a key driver in Xtratherm’s the gap between design and in all technical aspects of low
performance on site - energy fabric performance.
development of the Xi range
Collaboration with local colleges
of insulation. to promote better detailing on site
1. Performance through resources such as poster
Assessment R&D and on-line learning.
The technically enhanced QR linked installation animations and
All Xtratherm materials have
insulation systems, along with been 3rd party certified to resources directly available through
deliver the U-values and PSI product packaging.
educational resources and performances promised.
Comprehensive installation animations
in-house expertise combine Our Technical Team have been and instructions available on-line.
to assist developers and individually accredited under the
Full suite of CPD learning accredited
BBA / TIMSA competency scheme
designers to ‘Close the Gap’ to deliver accurate calculations to
by RIBA and CIAT.
between design and actual industry leading standards.
performance on site. Our materials have been assessed 3. Accredited
in situ in schemes such as AIMC4
and by national Building Developers Construction Details
that have delivered Code for Xtratherm published our first guide
Sustainable Homes levels to thermal bridging and the benefits
5/6 and Passive House levels. of good detailing in association with
We were the first UK insulation the BRE back in 2002. Our participation
manufacturer to have staff in the EST Enhanced Details program
qualified under the BRE Thermal allowed us to deliver learning resources
Modellers scheme. addressing the issue at a very early stage.
And the first UK manufacturer to Xtratherm have developed comprehensive
have thermal bridging details listed insulation systems with enhanced
under the BRE Certified Thermal jointing to meet the best practice
Details and Products Scheme. industry standards;
We were the first insulation manufacturer
to complete and qualify under the BRE
2. Skills & Knowledge Thermal Modeling qualification system.
Development Full thermal bridging detailing for
Xi Products have been 3rd party
Xtratherm has developed a range
accredited and are available as
of learning resources for industry.
BIM files.
The Xi Innovation Centre, a permanent
exhibition and training academyWe are committed to developing
insulation solutions that not only
meet but exceed the most
stringent industry standards.
Xtratherm UK Limited Tel Contact
Park Road Holmewood + 44 (0) 371 222 1033 info@xtratherm.com
Chesterfield Derbyshire Fax
S42 5UY + 44 (0) 371 222 1044 www.xtratherm.com
Call our Technical Team today
Tel 0371 222 1055
Good workmanship and appropriate site procedures are necessary to
achieve expected thermal and Air tightness performances. The example
calculations are indicative only. Default values for components and
cavities have been used. For specific U-value calculations please contact
Xtratherm Technical Support. Comprehensive guidance on installation
should be consulted. Xtratherm technical literature and Agrément
certification is available for download on the Xtratherm website. The
information contained in this publication is, to the best of our knowledge,
UKGXXXiA4
true and accurate but any recommendations or suggestions which may
be made are without guarantee since the conditions of use are
beyond our control.You can also read
