Villar del Rey Classic Natural Slates
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CI / SfB I I (47) I Ne5 I
Uniclass JH62
January 2010
BBuilding
U I L D I aN Better
G P R Tomorrow
ODUCTS
Villar del Rey
Classic Natural Slates
Villar del Rey
Classic Natural Slates
Tegral has a long and distinguished history in the Irish slate market. For over 70 years, we have
developed a deep understanding of the requirements of the customer as well as exceptional
knowledge of double-lap slating, both in terms of products and applications. Our commitment to
excellence in product performance enables us to bring to the market a reliable natural slate suitable
for all applications in the Republic of Ireland and Northern Ireland.
VILLAR DEL REY NATURAL SLATES PERFORMANCE AND QUALITY progresses will not reduce the perform-
The town of Villar del Rey (Village of the Tegral's Quality Control Officer, based in ance of the slate on the roof.
King) near Badajoz in the centre of the Ponferrada in Northern Spain, carries out • Continuous chemical and
Iberian Peninsula has been associated with regular inspections on an on-going basis. weathering tests.
slate for centuries. The roof slate, with its Liaison with quarries is a vital part of the • Management feedback to the quarry to
distinctive smooth surface, fine grain and Tegral procurement operation to ensure enable continuous quality upgrading.
dark Charcoal-Grey colouring is the that slate supplies meet our high quality • In-house quality auditing on deliveries
superior Spanish slate in the Tegral range. threshold. In addition, testing of slates is from the quarry.
carried out randomly every month.
Villar del Rey slates are very easy to grade TRACEABILITY
and lay due to their uniformity in size and TONAL VARIATION Villar del Rey slates are sourced direct from
thickness. They are available pre-holed and All Classic Natural Slates have a natural one single quarry, and all the goods
un-holed and can be supplied in a range of tonal variation which ensures that the documentation, labelling, and identifica-
4 sizes. unique rock characteristics of the inividual tion, guarantee that the specified material
slate enhances the aesthetic qualities of the is supplied.
ADVANTAGES building.
• 75 year guarantee ANALYSIS
• ISO 9002 Quality Management System CONTROLS Because it is a natural product, the charac-
• Flat and even surface makes grading and The following controls are in operation on teristics of the slate vary according to where
laying easy Villar del Rey slates: in the quarry it is selected. Tegral Villar del
• Charcoal-Grey colour with subtle natural • Petrographic analysis of samples to Rey slates are only sourced from defined
variations on roof determine structure and suitability of areas of the quarry, where scientific analysis
rock for conversion to a long life roofing shows that a particular area of rock within
slate. the quarry meets our stringent criteria.
• X-ray diffraction analysis to determine
the mineral composition of the rock to
ensure that changes which occur in the
rock’s composition as extraction
WORKMANSHIP
Grading and fixing natural slates is a skilled craft. It should only be carried out by slaters who are
competent to complete all processes in roofing with quarried slates to achieve a finished roof which
is both weatherproof and aesthetically pleasing. Many natural slated roofs are spoiled by incorrect
workmanship and lack of knowledge of basic principles of slating.
GRADING HOLING With regard to slate specification and
Tegral Villar del Rey natural slates should Villar del Rey slates are normally supplied workmanship, reference can be made
always be removed from their crates and pre-holed to a standard lap. Un-holed to the following codes: ICP2:2002 or
sorted and graded according to thickness. slates can be supplied as a special order. BS 5534:1997 and BS 8000: Part 6.
For unholed slates this is done either before In this case, the tables below should be Reference should also be made to Tegral's
being holed or during the holing process. followed as the position of the nail hole is Slating Manual for full information.
They should be graded into three separate related to the pitch of the roof and the
thicknesses. The thickest slates are for use exposure conditions. Villar del Rey slates
at the bottom section of the roof, the are easily cut and holed using conventional
medium size for the middle section and the slating tools. In order to carry out correctly
thinnest for the top section. While being the holing procedure, the guidelines below
graded, slates should be tapped for sound- should be followed.
ness; this will detect any possible flaws
prior to fixing. Proper grading of slates THE NAIL HOLE
prevents “kicking”, breakages on the roof The slate nail should be located close to
and/or unsightly gaps between courses. the edge of the slate, usually 20mm to
25mm approximately. The nail hole should
Particular care and attention to grading is be made from the bed of the slate to the
required where the roof pitch is less than face. This leaves a slight countersink in the
30º or on single-storey buildings, as the surface of the slate to take the head of the
thicker end of the slate is more visible in slate nail. Holing may be made by hand or
these situations. by machine.
Batten Gauge Holing Gauge
APPROXIMATE QUANTITY OF SLATES PER SQ.M.
Length of slate – lap Batten gauge + lap + 8 to 15mm
2
Headlap 610x300 510x250 400x250 350x250
mm
65 12.2 18.0 23.9 28.1 NORMAL EXPOSURE – MINIMUM PITCHES AND LAPS
75 12.5 18.4 24.6 29.1 Size of Slate 22.5º 25º 30º 35º 45º
80 12.6 18.6 25.0 29.6 610x300 105mm 90mm 80mm 75mm 65mm
90 12.8 19.0 25.8 30.8 510x250 110mm 90mm 80mm 75mm 65mm
100 13.1 19.5 26.7 32.0 400x250 110mm 90mm 80mm 75mm 65mm
105 13.2 19.8 27.1 32.7 350x250 - 90mm 80mm 75mm 65mm
110 13.3 20.0 27.6 33.3
SEVERE EXPOSURE – MINIMUM PITCHES AND LAPS
115 13.5 20.3 28.1 34.0
Size of Slate 22.5º 25º 30º 35º 45º
120 13.6 20.5 28.6 –
610x300 140mm 120mm 105mm 90mm 75mm
130 13.9 21.1 29.6 –
510x250 130mm 115mm 100mm 90mm 65mm
140 14.2 21.6 – –
400x250 - 115mm 100mm 90mm 65mm
150 14.5 22.2 – –
350x250 - - 90mm 75mm 65mm
Note. Villar del Rey pre-holed slates are holed to a headlap of 90mm and are not suitable for use where a greater
headlap is required. Where un-holed slates are being used, this table gives relevant pitch and lap information. For rafter
lengths greater than 6m measured on plan, contact the Technical Support Department.
Size of Slate Grade Holed* Unholed Approx. No. Approx. weight Approx. weight Weight per m2 (kg) Nominal
(mm) (special order) per crate (kg) per slate (kg) per crate laid at 100mm lap Thickness
610x300 Prime 425 3.1 1320 40.6 7mm
510x250 Prime 650 1.9 1235 38.0 7mm
400x250 Prime 715 1.5 1070 40.0 7mm
350x250 Prime 1040 1.2 1250 38.4 7mm
*Villar del Rey slates are pre-holed to achieve a 90mm headlap. Slate-and-a-half’s available unholed for all sizes.
This page shows the eaves, verge and ridge of a standard roof Definition of Standard Roof
Any roof slope equal to or greater than the minimum
pitch for the size of slate preferred that has a rafter length
with Tegral Villar del Rey Natural slates. Each drawing is a three (horizontal projection - ie, measured on plan, not along
the slope, from ridge to eaves) not exceeding 6 metres.
dimensional representation of a scaled detail available separately
For non-standard and special roofs contact Technical
from Tegral’s Technical Support Department. Support Department.
a. b.
c.
a. Standard Eaves with Soffit b. Standard Undercloaked and Pointed c. Standard Bedded Ridge
Ventilation Verge
The eaves handles the greatest volume of As the roof verge is often subject to Tegral Villar del Rey Natural slates are
water of any part of the roof. Great care unusual, spiralling turbulence, it is impor- generally capped with Clay ridges bedded
needs to be taken when detailing and tant to ensure that the edge slates are in mortar. Tegral supply these ridges and
slating in this area. Below are some point- adequately secured. Verges are finished have a wide variety to choose from. As the
ers to achieving good practice in slating using an undercloaked, mortar-pointed ridge is the most exposed part of the roof,
this part of the roof: system. The following should be observed it must be securely fixed and should form a
• A tilting fillet should always be used, on the verge detail: weatherproof seal at the apex. Good and
falling towards the gutter at an angle of • Underlay should lap under the under- secure ridge fixing can be achieved as
approximately 10 degrees. This can be cloak and extend approximately 20mm follows:
achieved using either a continuous beyond the face of the wall. • Underlay should overlap the underlay on
timber piece, board material or Tegral • Use slate-and-a-half to start alternate the other slope by not less than 225mm.
underlay support tray. courses. • Increase headlap (never decrease) on the
• Where underlay is not resistant to UV • Undercloak on pointed verges should final few courses to achieve a neat and
degradation, an eaves reinforcement overhang by between 38mm and 50mm. uniform finish. It is vital to the weather-
strip of durable, UV- light resistant • Mortar should not touch batten ends proofing of the roof that the specified
material, such as a Type 5U felt or Tegral and be about 75mm wide. Dampen minimum headlap be provided in the
underlay support tray should be installed. mortar prior to pointing. vicinity of the ridge.
• The undereaves slate should be laid • “Shoulder” the last course but one to
“upside down” so that the dressed edge make head-nailing of the last course
of each slate tapers towards the other. easier.
This produces a strong, sharp line at the • In addition to mortar bedding mechani-
eaves. The length of this slate is equal to cally fix ridge capping within 900mm of
the gauge plus the headlap. the end of a ridge.
• Overhang the slates 50mm into the • End cappings should always be full
gutter. length.
• Tegral over-fascia ventilation can be • Ventilation ridges are available also from
incorporated as an alternative method to Tegral - details available on request.
the detail shown.
ACCESSORIES
The following accessories are available
SELECTING THE CORRECT CLAY RIDGE from Tegral as part of our “One Stop
AND HIP CAPPING Shop” policy.
Roof pitch Ridge capping Hip capping • Clay Ridges VENTILATION
25º 125º 135º • Ventex Breather Membrane For full information on Ventilation,
30º 115º 135º • Thrutex High Performance Underlay a Ventilation Solutions brochure is
35º 105º 125º • Slate Ventilators available on request.
40º 90º 115º • Copper Nails
45º 90º 115º • Slate Hooks Shown below is a selection of
60º special 90º • Coloured Trims Tegral clay ridges.
Plain Angular Ridge 450mm long Plain Angular Ridge 450mm long Plain Angular Ridge Vent 450mm long
Balltop Finial (hip or gable) Cocks-Comb Crested Ridge 305mm long Club Crested Ridge 305mm long
BUILDING PRODUCTS
GUARANTEE FIRE HEALTH & SAFETY
Tegral Building Products guarantee their Villar del Rey Villar del Rey natural slates are non-combustible. The A Health & Safety data sheet or COSHH sheet is available
natural slates for a period of 75 years when fixed in Building Regulations Guidance Document B (Ire) and from the Technical Support Department through
accordance with current Irish and British Codes of Approved Document B (UK) state that a slate roof on support@tegral.com, or by writing or telephoning the
Practice. A full written quarry guarantee is available on timber rafters with or without boarding and underlay is appropriate address below. All current Health and Safety
request. designated AA. regulations should be followed when working with Villar
del Rey natural slates. Foot traffic on slate roofs should
QUALITY ASSURANCE DELIVERY, HANDLING AND STORAGE always be avoided.
Rigorous quality assurance procedures are applied to all Villar del Rey slates are delivered in crates. As with all
our natural slate products. These include regular inspec- natural roofing materials, it is essential that they are FURTHER REFERENCE
tion and quality assessment during the production stages handled with due care on site. The storage area should be For further information on fixing and for a guide to the
at the quarries, coupled with an extensive range of firm and level. terms used in this literature as well as technical details
laboratory tests conducted within the Group Technical please refer to the Tegral Slating Manual or contact the
Laboratories which are fully equipped to meet the test Under no circumstances should natural slates be stacked Technical Support Department at support@tegral.com
requirements of BS 680 and IS EN12326. flat, but should be stored on their edges on wooden
battens placed between each layer.
Tegral Building Products Tegral Building Products Ltd.
Website: www.tegral.com Athy, Co. Kildare
Tel: +353 (0) 59 863 1316
Technical support email:
Fax: +353 (0) 59 863 8637
support@tegral.com
email: info@tegral.com
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