Cladding & Render
129 sources in the library on cladding & render. Each one says what the document covers and what it is good for. Name a source to see which document it is and where to read it. One at a time. Page 3 of 4.
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BSI (British Standards Institution)
The standard the conservation trade works to, and the one a listed-building or period-property note should name. BS 7913 is paywalled, so only the BSI catalogue page is public; it confirms the current edition is BS 7913:2013, published 31 December 2013, status Current, ISBN 978 0 580 75778 5, prepared by BSI committee B/560 and classified under ICS 91.040.99. The catalogue page states this is the SECOND edition, updated to align with current best practice, and that the standard describes best practice in the management and treatment of historic buildings, applying to historic buildings both WITH and WITHOUT statutory protection, which is the point most renovation articles miss when they treat conservation guidance as relevant only to listed buildings. Its named audience includes owners, users, occupiers and managers of historic buildings, architects, engineers, surveyors, building managers, conservators, planners and local authority building control officers. The listed descriptors show its coverage: conservation, legislation, maintenance, fire safety in buildings, costs, hazard prevention, inspection, repair, building maintenance, design, renovation, building specifications, contracts and records.
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BSI (British Standards Institution)
STATUS: CURRENT (marked Under Review). BS 8297:2017 was published 31 October 2017 and supersedes BS 8297:2000, which is withdrawn, and BS 8297:1995; note the title also changed, from Code of practice for design and installation of non-loadbearing precast concrete cladding to Design, manufacture and installation of architectural precast concrete cladding, so a note using the old title is quoting a superseded edition. It gives recommendations for architectural precast concrete units used as building cladding, as decorative elements or as permanent formwork, that is units supported by and fixed to a structural frame or wall to perform a cladding role, with particular attention to permanent and temporary movements and tolerances of the supporting structure and to verification of product quality. It excludes glass fibre reinforced concrete (GRC), small masonry units and the design of the supporting structure itself. Catalogue page confirms number, title, date, status, supersession and scope.
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BSI (British Standards Institution)
The code of practice for stone cladding fixed back mechanically, which is the reference point when comparing a genuine stone facade with brick slips or a stone effect render. Published 31 Dec 2020 and Current. Part 2 gives recommendations for the design, installation and maintenance of traditional handset external cladding of natural stone held directly to a structural backing by metal fixings, covering the sampling of stone for testing and production control testing, the provisions needed for the cladding to perform satisfactorily, the materials and methods most frequently used for stonework, and the use of thermal insulation behind external cladding. Its exclusions define the boundary with other systems: loadbearing masonry, cladding held only by adhesion, and any cladding supported or held around the perimeter by metal framing such as a rainscreen are all outside it, as are seismic loading and enhanced security scenarios such as blast. The general principles are noted as applying also to soffits and sloping surfaces.
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BSI (British Standards Institution)
The large-scale fire test that an external wall insulation or rainscreen system is put through when the route to compliance is a full system test rather than an A2 or A1 Euroclass on every component. Published 30 Apr 2020 and Current, superseding BS 8414-1:2015+A1:2017. Part 1 provides the test method for determining the fire performance characteristics of non-loadbearing external cladding systems, rainscreen over-cladding systems and external wall insulation systems fixed to and supported by a masonry substrate and exposed to an external fire under controlled conditions, recording fire propagation upwards, penetration through the system, falling debris and the extent of damage. Its stated exclusions matter when reading a manufacturer's test claim: it does not cover the performance of glass or its supporting frame for glazed window openings, the total configuration of a construction incorporating additional windows, doors, balconies or ancillary penetrations, or exposure to radiant heat from a fire in an adjacent building. Part 2 is the equivalent test on a structural steel frame.
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BSI (British Standards Institution)
The standard that governs how far a BS 8414 test result can be stretched to cover a system that is not identical to the one tested, which is the question behind most cladding compliance disputes. Published 30 Sep 2019 and Current. It specifies the procedures and rules used to evaluate variations and changes to products and systems tested to BS 8414-1:2015+A1:2017 or BS 8414-2:2015+A1:2017, and defines the options and limits for preparing reports on direct and extended application criteria. The systems covered are rainscreens, external thermal insulated composite systems (ETICS) and self-supporting double skin metal faced insulating sandwich panels. It expressly does not cover the performance of systems that include glazed elements, infill panels or external insulation finishing systems (EIFS), nor systems tested to BS EN 1364. A note explaining why a supplier's test certificate may not cover the exact build-up on a given house can cite this directly.
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BSI (British Standards Institution)
STATUS: CURRENT. BS EN 12588:2006 was published 31 January 2007, is identical to EN 12588:2006, and supersedes BS EN 12588:1999, which is withdrawn. It specifies the designation, chemical composition requirements, surface condition and dimensional tolerances for rolled lead sheet produced by roll deformation, for roofing, flashings, weatherings, cladding, pre formed panels, damp proof courses and similar building uses, and it includes the colour codes for thickness that give the familiar Code 3 to Code 8 lead sheet designations. Two changes from the 1999 edition are worth citing: the maximum tin content was raised from 0.005 per cent to 0.05 per cent to improve corrosion resistance, and manual handling guidance was added because of the weight of the product, along with recycling recommendations noting a documented recycling rate above 90 per cent. Catalogue page confirms number, title, date, status, supersession, scope and those changes.
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BSI (British Standards Institution)
STATUS: CURRENT (marked Under Review). BS EN 1304:2013 was published 30 June 2013 and is the harmonised product standard for clay roofing tiles and fittings used in pitched roof coverings and in vertical wall cladding and lining, superseding BS EN 1304:2005. It specifies structural characteristics, geometric properties, physical and mechanical characteristics, and gives the marking and evaluation of conformity requirements, so it is the standard a clay tile is CE or UKCA marked against. It sits alongside BS EN 490 for concrete tiles, BS EN 492 for fibre cement slates and BS EN 12326 for natural slate, with the test methods for clay tiles in the BS EN 539 series and installation in BS 5534. Catalogue page confirms number, title, date, status and scope; the requirement tables are paywalled.
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BSI (British Standards Institution)
The product standard for modern thin coat renders, which is the one silicone, silicone-silicate and acrylic renders are declared to rather than BS EN 998-1. Published 30 Sep 2017, Current, with Designated status for UKCA marking. It applies to factory made renders and plasters based on organic binders used as external or internal covering on walls, columns, partitions and ceilings, manufactured either as ready to use paste or in powder form, and it also covers renders and plasters with inorganic binders such as silicates, silanes, siloxanes and silicones. It contains definitions, final performance requirements and the characteristic categories used to designate a render, plus the assessment and verification of constancy of performance regime and marking requirements. Two exclusions matter: it does not apply to coating materials and coating systems, and it contains no recommendations for the design and application of renders and plasters, which is why it must be read with codes of application such as BS EN 13914-1 and national specifications. Pairing it with BS EN 998-1 lets a note distinguish a cement-based render from an organic thin coat render on a proper basis.
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BSI (British Standards Institution)
STATUS: WITHDRAWN on 31 January 2012. BS EN 490:2004+A1:2006 was published 19 January 2005, identical to EN 490:2004, and specified the requirements for concrete roofing tiles and fittings for pitched roof coverings and for wall cladding and lining. It was replaced by BS EN 490:2011, so a note citing the 2004 or 2006 edition is quoting a withdrawn one; an undated citation of BS EN 490 remains safe. The companion test method standard is BS EN 491, and the equivalents for other coverings are BS EN 1304 for clay tiles, BS EN 492 for fibre cement slates and BS EN 12326 for natural slate, with fixing and wind uplift design in BS 5534. Catalogue page confirms number, title, publication date, withdrawal date and scope but does not name the replacement.
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BSI (British Standards Institution)
STATUS: WITHDRAWN on 31 January 2012, on the same day as its companion product standard BS EN 490:2004+A1:2006. BS EN 491:2004 was published 18 January 2005, ISBN 0 580 45377 4, and specified the test methods for concrete roofing tiles and valley tiles for pitched roofs: dimensional checks on hanging length, squareness, cover width and flatness, and performance tests for mass, transverse (breaking) strength, impermeability, freeze thaw resistance and nib support. It was replaced by BS EN 491:2011. A note quoting transverse strength figures for concrete tiles tested to BS EN 491:2004 is citing a withdrawn edition. Catalogue page confirms number, title, publication date, withdrawal date and scope but does not name the replacement.
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UKAS
The body that sits one level above every certification mark a product carries, and the answer to the question of who checks the checkers. UKAS states that it is the National Accreditation Body for the United Kingdom, appointed by government to assess and accredit organisations providing services including certification, testing, inspection, calibration, validation and verification. Its site carries a searchable directory of accredited organisations, an explanation of the difference between accreditation and certification, and an impartiality statement. This matters for the insulation and cladding clusters in particular: a performance claim tested at a UKAS accredited laboratory, or certified by a UKAS accredited certification body such as the BBA or WRAS, sits on a different footing from an in-house test result or a self-declared figure, and the directory lets that be checked rather than assumed.
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United Kingdom Accreditation Service
UKAS explains what each sanction means in practice. A suspension is normally temporary, with the body expected to regain accreditation within three months and up to nine in exceptional circumstances. While suspended an organisation cannot provide accredited services, cannot issue new accredited certificates, and must tell existing and prospective customers of its status. Certificates issued before the suspension remain valid unless they were issued incorrectly, though annual surveillance or renewal visits falling inside the suspension period may not be supportable.
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BM TRADA (Element)
BM TRADA is an independent certification, training and technical services organisation, part of Element, providing third-party certification for a range of fire and non-fire products against relevant international standards. It runs a Check a Certificate verification service so a claimed certification on a timber or door product can be confirmed rather than taken on trust, and it publishes an Impartiality Policy. Its sister organisation Warringtonfire provides fire resistance and reaction to fire testing. Cite this as the verification route when a note says a reader should check that a cladding board or fire door carries genuine third-party certification.
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Brick Development Association
The BDA is the UK trade body for clay brick, based in Stoke-on-Trent. It states clay brick has a minimum lifespan of 150 years and a low carbon footprint from locally sourced natural materials, and positions brick against the Building Safety Act and Future Homes Standard. It publishes guides, research papers and CPD material through its Resources section and provides a Brick Calculator tool for working out quantities, which is the practical item for a note estimating a brick slip or brick cladding job. It has run the Brick Awards for 50 years.
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CWCT (Centre for Window and Cladding Technology)
The UK technical authority for cladding and facade systems, and the publisher of the CWCT Standard for Systemised Building Envelopes that a rainscreen specification will normally reference. Its site carries a Standards section split into Technical Updates, Guides and Reports, Technical Notes, Superseded Standards and External Publications, plus the FACETS resource and the Cladding Forum for members. Two publication strands are worth naming in a cladding note: the CWCT and Society of Facade Engineering fire guidance, and the CWCT embodied carbon methodology for facades. Use it as the source for what a professionally specified rainscreen has to satisfy, as distinct from the Building Regulations minimum in regulation 7.
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INCA
INCA is the recognised trade association for the external wall insulation industry in the UK, established in 1981, representing system designers, installation contractors and component suppliers in three membership categories: EWI installers, EWI system designers, and INCA Associates. Members must meet published criteria, set out in Membership Criteria Combined 2025, so that a client is engaging a specialist contractor meeting recognised standards of competence. Its knowledge hub carries EWI Retrofit PAS 2035 guidance, external wall insulation FAQs, technical guidance, the EWI Industry Report 2025 and publications on the benefits of EWI and the fabric-first approach. Useful for the PAS 2035 requirement behind grant-funded EWI and for pointing a reader at a competent installer.
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INCA (Insulated Render and Cladding Association)
The trade association's collected answers on external wall insulation, useful for the practical questions a cost or how-to note has to handle: whether EWI suits a given construction type, what survey and system design precede specification, how insulant type and thickness are chosen against overhangs and boundaries, what render and brick slip finishes are available, and how INCA member systems are certified. Sits within INCA's Knowledge Hub alongside its technical guidance, its EWI Retrofit PAS 2035 material and the INCA EWI Directory of system designers and contractor members, which is the register to check an installer against.
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INCA (Insulated Render and Cladding Association)
The EWI trade association's own homeowner guide, and one of the few published UK sources with a rate per square metre for external wall insulation. As a very general guide it puts a standard system of 90 mm EPS board fixed to a masonry substrate finished with a lightly textured silicone render at somewhere between 65 and 95 pounds per square metre, with thicker insulation and different finishes increasing that. In whole-house terms it gives roughly 4,000 to 6,000 pounds for a small terraced property, 8,000 to 10,000 pounds for an average semi, and up to 12,000 to 14,000 pounds or more for larger detached homes. On savings it states a reduction in energy usage of up to 40 per cent and cites an Energy Saving Trust estimate of up to 455 pounds a year, expressly noted as a pre-2022 energy price figure. On planning it says in most cases planning permission is not required but the local planning office should always be checked first. On certification it states that all INCA member EWI systems are covered by British Board of Agrement certification, accredited to ISO 9001, and conform to current building and EWI fire regulations. Insulant is typically EPS or mineral fibre, with thickness set by the target thermal improvement and constrained by existing overhangs and by not encroaching on neighbouring property, walkways or public land; finishes include thin coat render, thick coat render, dry dash with local stone chips, stone effect, brick effect and timber panel effect, and these can be mixed on one elevation.
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Structural Timber Association
The STA is the trade body representing structural timber manufacturers and specifiers, working to increase structural timber specification and to influence legislation and regulation in the sector. Its flagship technical document is the Volume 1 Pattern Book, covering the fire resistance performance of a range of commonly used structural timber walls and floors and explaining component build-ups and the modifications that are permitted. The Pattern Book is freely available to designers and specifiers but may only be used on projects where the timber frame, SIPs or mass timber elements are supplied by an STA member manufacturer, a limitation worth stating if a note points a reader to it. The STA also runs the STA Assure Quality Assurance Scheme for member competency and publishes fire research on timber frame and mass timber systems.
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University of Bath
Laboratory testing of retrofit options on single-skin and cavity brick walls between two opposing climate chambers, with temperature, relative humidity and heat flux logged by surface sensors every 10 minutes under steady-state winter and summer scenarios (Journal of Building Engineering vol 23, pages 241-249, 2019). Findings a specifier can act on: single and cavity brick walls behaved significantly differently, and there was a high condensation risk in the non-ventilated air cavity of the double wall. A pervious lime-cement mortar render substantially improved the thermal performance of the single wall but increased the condensation risk of the cavity wall, so the same render is a good move on one construction and a bad one on the other. Adding an insulation layer reduced thermal conductance as expected, but the improvement in the summer scenario was considerably lower than in winter. The paper concludes effective retrofit depends on the material, the wall layout and the climate together, not on the material alone.
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Baumit
Grey (graphite) expanded polystyrene board with square edges for external wall insulation systems. Board size 1200 x 600 mm, available in 20 to 280 mm thicknesses. Fire resistance class B1-s1-d0 approved according to ETAG 004 as stated on the page.
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Buildland
Builders' merchant product page for a pre-bagged coloured tyrolean finish in 25 kg bags; it gives the bag price range by colour with and without VAT.
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Cedral (Etex)
Flat fibre cement facade board, thickness 9 mm, available 2500 x 200 mm, 2500 x 300 mm, 2500 x 400 mm, 2500 x 1220 mm and 3050 x 1220 mm. Weight ranges from 6.5 to 47.4 kg per board depending on size. Fire safety classification A2-s1, d0 to EN 13501-1:2018. CCPI assessed.
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Cedral (Etex)
Fibre cement cladding board with a concealed click fixing. Length 3600 mm, width 186 mm, thickness 12 mm, weight 12.20 kg per siding, 1.60 sidings per m2 of facade. Fire safety classification A2-s1, d0 to EN 13501-1:2018. Can be placed horizontally or vertically, needs no painting, CCPI assessed.
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Cedral (Etex)
Fibre cement weatherboard. Length 3600 mm, width 190 mm, thickness 10 mm, weight 11.20 kg per siding, 1.74 sidings per m2 of facade. Fire safety classification A2-s1, d0 to EN 13501-1:2018. Available in 22 colours with woodgrain or smooth finish, can be fitted horizontally or vertically, CCPI assessed. Covered by Cedral BBA certificates.
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FloPlast Limited
FloPlast white PVC-UE roofline range. Four fascia profiles with different thicknesses and roles. Universal Fascia Board 9mm, widths 100, 150, 175, 200, 225, 250, 275, 300 and 354mm plus 450mm, intended for refurbishment capping over existing timber. Ogee Fascia Board 10mm, widths 150, 175, 200, 225, 250, 404mm, a decorative alternative to the Universal. Mammoth Board 18mm, widths 150, 175, 200, 225, 250, 300 and 404mm, which does not need a backing board because of its rigid linear strength and thickness, so it can be fixed directly to the rafter ends in new build. Ogee Mammoth Board 18mm is the decorative version of the Mammoth. The 9mm/18mm distinction is the one that decides whether the old timber fascia has to stay in place.
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James Hardie
Large format fibre cement facade board in 8 mm and 11 mm thicknesses. Sheet sizes raw 2438 mm (net 2428 mm) and raw 3048 mm (net 3038 mm) long by raw 1220 mm (net 1210 mm) wide. Weight 10.2 kg/m2 at 8 mm and 14.4 kg/m2 at 11 mm. Fire Classification A2-s1, d0 for both thicknesses. Natural fibre cement texture, 6 standard colours with custom colour on request.
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James Hardie
Fibre cement plank with a cedar texture. Thickness 11 mm, length 3600 mm, width 214 mm with a 182 mm visible surface. Weight 10.5 kg per piece; 1.52 pieces per m2. Fire Classification A2-s1, d0. Eight standard colours.
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K Rend (Kilwaughter Minerals)
Cement based polymer modified basecoat, 25 kg sacks, mixed with 5 to 6 litres of clean water and at least 5 minutes mixing. Coverage 1.8 kg per mm thickness per m2, requiring approximately 8 to 11 kg/m2 at a nominal 4 to 6 mm thickness. Kitemark classifications: compressive strength CS IV, capillary water absorption category W2, thermal conductivity P=50% 0.46. Also used as an insulation bedding adhesive for polystyrene boards onto masonry, applied as a continuous perimeter line plus centre dabs covering at least 50% of the board, or with a notched trowel over the whole board face. Alkali resistant reinforcing mesh may be required.
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K Rend (Kilwaughter Minerals)
Modified acrylic bonding coat used to improve adhesion of K Rend renders to difficult substrates. Density approximately 1.2 kg/m3 as stated on the sheet. Coverage approximately 0.25 to 0.45 kg/m2 depending on substrate. Tools and equipment cleaned with water immediately after use.
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K Rend (Kilwaughter Minerals)
Ready to use organic resin thin coat render with silicone resin emulsion and acrylic dispersion, supplied in 25 kg buckets. Coverage by grain size: TC 05 (largest grain 0.5 mm) about 16 m2 per 25 kg bucket or 1.6 kg/m2 by hand and about 20 m2 or 1.3 kg/m2 sprayed; TC 10 (1.0 mm) about 14 m2 or 1.8 kg/m2; TC 15 (1.5 mm) about 10 m2 or 2.5 kg/m2; TC 30 (3.0 mm) about 5 m2 or 5 kg/m2. Classified to BS EN 15824: 2009: water vapour permeability Category V2, water absorption Category W3, adhesion 0.65 MPa, thermal conductivity lambda10 dry 0.83 (P=50%) and 0.93 (P=90%), density approximately 1,800 kg/m3, designation Coating Material DIN 18558 P Org 1. Reaction to fire Class A2-s1,d0. Substrate and air minimum 5 C at application; allow freshly applied basecoats a minimum of 14 days; prime with K Rend Primer TC and allow 24 hours.
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Kingspan Insulation
Rock mineral fibre rainscreen slab, thermal conductivity 0.034 W/mK, density 45 kg/m3, slabs 1200 x 600 mm. BBA Certificate 20/5845 covers thicknesses 30 to 200 mm. Fire: achieves European Classification (Euroclass) A1 when classified to EN 13501-1: 2018.
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Kingspan Insulation
Phenolic rainscreen board, 2400 x 1200 mm, covered by BBA Certificate 14/5134 in thicknesses 25 to 150 mm. Two declared lambda values: 0.022 W/mK for insulant thickness 25 to 44 mm, and 0.021 W/mK for 45 to 150 mm. Declared compressive strength 100 kPa to BS EN 826: 2013. Published R-values (m2K/W) start at 50 mm 2.35, 60 mm 2.85, 70 mm 3.30. Fire: K15 achieves European Classification (Euroclass) C-s2,d0 when classified to EN 13501-1: 2018, test reference EUI-22-SBI-000057-A, with BS 8414 tested system reports listed separately.
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Kingspan Insulation
Phenolic external wall board for render and brick slip systems, 1200 x 600 mm. Two declared lambda values: 0.022 W/mK for insulant thickness 25 to 44 mm, and 0.021 W/mK for 45 to 100 mm. Declared compressive strength 100 kPa to EN 826: 2013. R-value at 25 mm is 1.10 m2K/W and rises with thickness. Fire: K5 achieves European Classification (Euroclass) C-s2,d0 when classified to EN 13501-1: 2018, test report EUI-22-SBI-000352 and classification report EUI-22-000352.
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Knauf Insulation
Glass mineral wool multi purpose slab, 1200 mm long in 400 mm and 600 mm widths, ECOSE Technology binder. Declared thermal conductivity 0.035 W/(mK). Reaction to fire A1 to EN 13501-1. Published R-values by thickness: 50 mm 1.40, 70 mm 2.00, 75 mm 2.10, 100 mm 2.85, 140 mm 4.00, 150 mm 4.25 (m2K)/W. Holds BBA Agrement certificate 24/7110 for use as insulation between rainscreen facade systems, and a BBA certificate for timber and steel frame construction.
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Knauf Insulation
Rock mineral wool slab for external wall insulation systems, 1200 x 600 mm, adhered and mechanically fixed or mechanically fixed only. Declared thermal conductivity 0.036 W/(mK). Reaction to fire A1 to EN 13501-1, which Knauf states removes the need for fire barriers in the system. Thicknesses 60, 90, 100, 120, 150, 170, 200, 230, 250 and 270 mm. BBA Agrement certificate 24/7271.
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Knauf Insulation
Water repellent rock mineral wool sheathing slab for rainscreen facade systems on buildings of any height, 1200 x 600 mm. Declared thermal conductivity 0.034 W/(mK). Reaction to fire A1 to EN 13501-1. Thicknesses run 50, 60, 70, 75, 80, 90, 100, 110, 120, 125, 130, 140, 150, 160, 165, 170, 180, 190, 200, 210, 220, 230, 240 and 250 mm. BBA Agrement certificate 19/5609.
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Marley Ltd
Marley Weatherboard fibre cement external cladding board: 3600mm long, 200mm wide, 8mm thick, 8.6 kg per board, with a 30-50mm recommended lap. Textured woodgrain finish in 5 colours. Marley states the 200mm width and higher coverage per board saves up to 10% on labour and material costs compared with other weatherboard alternatives, and that it avoids the rot, maintenance and repainting of timber.
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PermaRock Products Ltd
Graphite loaded, flame retardant additive grade expanded polystyrene board for external wall insulation, to EN 13163. Standard dimensions 1200 x 600 mm, standard thicknesses 20 to 300 mm in 10 mm increments. Density about 16 kg/m3. Declared thermal conductivity 0.030 W/mK to EN 13163. Water vapour permeability 0.009 to 0.020 mg/(Pa.h.m). Fire behaviour B-s1,d0 or B-s2,d0 to EN 13501-1 depending on the finish used. The PermaRock EPS Premium system can be used on buildings up to 18 m in height. Zero ozone depletion potential, Green Guide A+.
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PermaRock Products Ltd
Non combustible mineral fibre EWI boards to BS EN 13162: 2012+A1:2015, supplied in Dual Density (DD), High Density (HD) and Mono Density (MD1 and MD2) types. Reaction to Fire Euroclass A1 for all insulation types to BS EN 13501-1. Board size 1200 x 600 mm for all types. Thickness ranges in 10 mm increments: DD 50 to 250 mm, HD 30 to 40 mm, MD1 30 to 250 mm, MD2 50 to 250 mm. Declared thermal conductivity: DD 0.036, HD 0.038, MD1 0.035, MD2 0.036 W/mK. Compressive strength at least 10 kPa for DD and HD, at least 10 kPa (MD1 at 50-90 and 210-250 mm) or at least 30 kPa (MD1 at other thicknesses and MD2). Tensile strength at least 10 kPa (DD, MD1, MD2) and at least 15 kPa (HD). Third party accreditation under Kiwa BDA Agrement Certificates BAW-24-331-S-A-UK, BAW-24-332-S-A-UK and BAW-25-403-S-A-UK.