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Roofing Slate TECHNICAL MANUAL

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Roofing Slate TECHNICAL MANUAL Roofing Slate TECHNICAL MANUAL www.ensorbuilding.com www.ensorbuilding.com WE MAKE IT HAPPEN NEED TECHNICAL ADVICE - ENSURE IT’S 01254 52244 t natural roofin es g fin sla e t h e T s sourced from around the World WE HAVE IT COVERED Having specialised in the supply of natural roofing ensuring all goods are competitively priced and slates since 1929, our reputation speaks for itself and produced to meet exacting specifications and quality our depth of knowledge is unbeatable. control procedures. Our ongoing programme of investment in capital equipment together with the In the early days our company was one of only a people involved through the processes, ensure peace handful of original Main Agents appointed by the of mind for our customers. Welsh & Westmorland Quarries. These days however, Spain rather than Wales is the world’s largest producer Our imported range of slate is branded Sobrano™, of natural roofing slate, with China fast emerging as a a derivative of the Spanish word meaning ‘the best’, strong contender for this Crown. The general growth and is exclusive to Ensor Building Products. Only by of imported products throughout the UK since the insisting on Sobrano™ Natural Roofing Slates can early 1970’s, propagated by strong customer demand, designers, distributors and installers alike be assured has seen a switch in our companies emphasis and of a proven quality and pedigree, which is simply focus. Our credentials are time served and proven unmatched by other so called importers and having imported Spanish roof slates since 1976 and distributors. Chinese roof slates since 1999. All Sobrano™ Spanish and Chinese Natural To assist in the development and management of our Roofing Slates are compliant with European co-operation with China, we have our own registered Construction Products Regulation company based in Xiamen, South East China, EU305/2011 and are CE marked. MEAN RESULTS OF SOBRANO SLATES TEST CHINESE SPANISH WATER ABSORPTION A1 A1 THERMAL CYCLING T1 T1 CARBONATE CONTENT >20% 1% SULPHUR DIOXIDE S1-S3 S1 SLATE TESTING AT A GLANCE Water Absorption relates to the slate’s absorbency; the lower the better and if higher than 0.6% then slates should be subjected to a separate freeze/thaw test. A1 is the highest rating achievable. Thermal Cycling relates to the stability of pyrite content in the slate and whether it is likely to oxidise or rust. T1 is the highest rating achievable and denotes ‘no change in appearance’; T3 is the lowest rating and denotes ‘oxidisation or appearance changes of metallic minerals that penetrate the slate and risk forming holes’. Carbonate Content relates to how much carbonate is present in the slate; the lower the better to reduce risk of accelerated weathering, fading and colour change. Sulphur Dioxide Exposure indicates how slates are likely to perform in acidic or polluted environments. S1 is the highest rating though both S2 and S3 are within the scope of the European Standard BS EN 12326 and can be used in areas of moderate/light atmospheric pollution, which applies to most areas of the UK and Ireland. 3 www.ensorbuilding.com t natural roofin es g fin sla e t h e T s sourced from around the World SOBRANOTM - CHINESE NATURAL ROOFING SLATES If cost is the main driver then Chinese Slate is the product of choice. Most of the industry is made up of parasitic so-called importers that dabble in sourcing slates from non-reputable sources in China. We think that’s a mistake. Importing and distributing Chinese slates in the UK is a different business. It takes a greater level of expertise; it also requires a different team with a proficient and high level of experience and expertise. Having imported directly from China since 1999 and with our own registered company based in Xiamen, no other importer and distributor can offer a better understanding of the Chinese quarry network, which in turn benefits our clients as follows: • The depth of stock on the ground • The extensive range of sizes we offer, including slate and halves • Different types of slate to suit design criteria, be it price, consistency of thickness and appearance or a more rustic, natural look • Consistent quality and promotion of ethical working conditions • Sturdiness of crates and packaging, thereby minimising the level of breakages that can occur in transit. As specialist bulk importers, we stock the most varied and comprehensive range of natural roofing slates available in the UK. This enables us to supply any quantity, of any grade, at the most competitive price. We have an extensive choice of colours, sizes, grades and thicknesses, including slate and halves, double and eaves slates, backed up with relevant industry testing and performance guarantees up to 50 years. 4 NEED TECHNICAL ADVICE - ENSURE IT’S 01254 52244 SOBRANOTM PREMIER CHINESE A low cost charcoal/grey slate that is uniform in thickness, texture and appearance. A feature of this particular slate is its tendency to naturally weather relatively quickly, thereby creating the appearance of a more established, mature and naturally aged roof that blends well with existing roofs in the surrounding area. Unlike second hand slates it comes with a performance warranty and is the ideal choice where low price is the main criteria. WIDE RANGE OF SIZES AVAILABLE FROM STOCK Our direct relationship with a number of Chinese slate producers enables us to offer an outstanding range which is unmatched by our rivals. All our slate range is available to order from stock. SIZES • 610 x 355 mm • 600 x 300 mm • 560 x 305 mm • 500 x 300 mm • 500 x 250 mm • 450 x 300 mm • 450 x 250 mm • 400 x 300 mm • 400 x 250 mm A full range of slate and halves, double slates, eaves slates are also available off-the-shelf. Authorised Quarry Ensor Holdings Plc., F21/A, Yu Bincheng A, Quarry No 21 Southpark Road, Xiamen City, TECHNICAL DETAILS: Representative: Fujian Province, P.R. China Product Specification: EN 12326-1:2004 Product Description: Roofing and External Cladding Slate Dimensions and dimensional variation: Complies (deviation < +/- 5 mm) Nominal thickness and variation: 6 mm (< +/- 35%) Characteristic MoR Transverse: 40.65MPa Longitudinal: 57.57MPa Mechanical resistance Mean failure load Transverse: 669.7N Longitudinal: 1852.9N Water permeability - water absorption: Complies <0.6% Code A1 Carbonate content: Complies <20% Durability water absorption: Complies <0.6% Code A1 Durability freeze thaw cycling: Not required Durability thermal cycling: Complies with Code T1 Durability sulphur dioxide exposure: Complies with Code S1 Durability non-carbonate carbon content: Complies <2% Release of dangerous substances: None in conditions as roofing or external cladding External fire performance: Deemed to satisfy Reaction to fire: Deemed to satisfy Class A1 5 www.ensorbuilding.com t natural roofin es g fin sla e t h e T s sourced from around the World SOBRANOTM - SPANISH NATURAL ROOFING SLATES As specialist importers and distributors for over thirty years, we offer unrivalled experience in terms of supplying Spanish Natural Roofing Slates for the UK market. 90% of Europe’s natural slate used for roofing originates from the slate industry in Spain with Galicia being the primary source of production. Traditionally, the UK slate market has offered a wide variety of different types of slate. Each UK importer has their own commercial references depending on the characteristics of its sources, which leads to general confusion in the market place. The first class slate from a company may be very different from the first class of other company. In general, the quality criteria are similar for the entire sector (no alterable minerals, adequate thickness, uniform exfoliation, etc.), although it is the final use of the slate tiles which really define the specific requirements. At Ensor we believe in cutting through the misleading dogma and nonsense that exists out in the market place and by keeping things simple for everyone concerned. Given our experience and pedigree, you can be sure that we offer the right product at the right price. 6 NEED TECHNICAL ADVICE - ENSURE IT’S 01254 52244 SOBRANOTM BOEZA A blue/grey coloured slate, hand split to a nominal thickness of 5 to 6 mm. Sobrano™ Boeza slates have a moderately textured surface which provides a roof of depth of character. FORMATS: Rectangular WATER ABSORPTION: < 0.4% TECHNICAL DETAILS: SIZES: 60x30 cm, 50x25 cm and 40x25 cm SPECIFIC WEIGHT: 2.7 (GR/CM3) including slate and a half to suit. LONGITUDINAL RESISTANCE: > 60 MPA Boeza slates are in compliance with the following CARBON CONTENT: <2% specifications - British Standard: BS EN 12326 THICKNESS: 5 - 6 mm SOBRANOTM PACIOS A blue/grey coloured slate, hand split to a nominal thickness of between 4 to 6 mm. Heavy thicknesses are also available. Sobrano™ Pacios slates have a generally smooth surface which provides a roof of flat even texture. FORMATS: Rectangular WATER ABSORPTION: < 0.4% TECHNICAL DETAILS: SIZES: 60x30 cm and 50x25 cm including SPECIFIC WEIGHT: 2.8 (GR/CM3) slate and a half to suit. LONGITUDINAL RESISTANCE: > 70 MPA Pacios slates are in compliance with the following CARBON CONTENT: <1% specifications - British Standard: BS EN 12326 THICKNESS: 4 - 6 mm SOBRANOTM TABARA A blue/grey coloured slate, hand split to a nominal thickness of between 4 to 6 mm. Sobrano™ Tabara slates have a slightly textured surface and which provides an aesthetically pleasing appearance to a the overall roof finish. FORMATS: Rectangular WATER ABSORPTION: < 0.4% TECHNICAL DETAILS: SIZES: 60x30 cm, 50x25 cm, 40x25 cm and SPECIFIC WEIGHT: 2.7 (GR/CM3) 40x20 cm including slate and a half to suit. LONGITUDINAL RESISTANCE: > 70 MPA Tabara slates are in compliance with the following CARBON CONTENT: <1.4% specifications - British Standard: BS EN 12326 THICKNESS: 5 - 6 mm & 8 mm heavy 7 www.ensorbuilding.com SLATING TERMINOLOGY 2 1 1 head 2 20-25 mm 3 3 gauge = slate length - headlap 2 4 4 headlap 5 holing gauge = gauge + lap + 8-15 mm 6 tail 5 7 bond or side lap 6 8 margin 8 APPLICATION Full details of the roof slating process are given in the code of practice for slating and tiling BS5534: 2003 and Workmanship on Building Sites BS8000: part 6: 1990.
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