Verified by manufacturer over a year ago
BBA 09-4625 PS4 - Timber Frame
BBA Agrément Certificate
Certificate type
External wall insulation systems for steel and timber-framed buildings.
The Epsitec External Wall Insulation System for steel and timber framed buildings, comprising mechanically fixed stone wool boards with basecoat and glassfibre reinforcement mesh applied over the top, primed and finished in a silicone texture.
Finish | Silicone |
Material | Stone wool Silicone |
Shape | Other |
Length | Bespoke |
Width | Bespoke |
Height | Bespoke |
Warranty description | Ten year |
Uniclass | |
CAWS | M21/20 External wall insulation system . . . . . . M21/210 External wall insulation system |
System performance | Durability - 30 years; Fire performance to BS EN 13501, A2-s1, d0.Guidance for specification option: When installed and maintained in accordance with the manufacturer's recommendations and the BBA Certificate, the system will remain effective for at least 30 years. Durability - 60 years; Fire performance to BS EN 13501-1, A2-s1, d0.Guidance for specification option: This system also has a 60-year life expectancy when installed to BOPAS requirements. Manufacturer guidanceThe systems can improve the thermal performance of external walls and can contribute to satisfying the requirements of the National Building Regulations. For further information please visit the system’s BBA Certificate. |
Preparation | Not required.WBS Biocidal Wash.Manufacturer guidanceEnsure the substrate is clean and structurally sound. The substrate must be completely dry and not damaged by rain or frost. Consult the board manufacturer and redo pull-out tests before continuing if rain or frost damage is evident. Sheathing boards must achieve minimum pull out requirements to be suitable for the system application. Ensure sheathing boards or panel substrates are line and level to allow RagRails to be installed flush to the substrate. Slight variances in the substrate can be overcome by using suitable packers to ensure the system is installed line and level. All sheathing boards must be securely fixed correctly jointed and sealed (where required) as per the board manufacturer's instructions. If the walls are not line and level, the fixing lengths must be checked to ensure adequate embedment into the sheathing board / frame substrate. This will need to be confirmed on site prior to the installation of the Wetherby system. Sizing of flashings trims and beads may also require alterations. Existing timber or steel cladding - remove any defective areas of the existing substrate and where required make repairs ensuring the surface is ready to receive the EWI system. The existing walls are to be cleaned to the satisfaction of the Contract Administrator to remove any friable material algae or lichen. WBS Biocidal Wash can be used to treat areas of moss algae and mould growth. |
Support rails and brackets | |
Material | 15 mm RagRail cavity spacer rails.25 mm RagRail cavity spacer rails.25 mm Timber battens.Manufacturer guidanceThe RagRails or timber battens help to create a drainage cavity between the sheathed frame and external wall insulation. This cavity will then allow for any moisture located within these areas to track down and drain out, either from the bottom of the system or into specifically designed drainage boxes. |
Bracket fixings | R-QCP.Manufacturer guidanceThe fixings of the rails or battens will need to be appropriate for the substrate that the system will be installed over. Fixings and the frequency of them will be subject to pull out tests and wind load calculations. |
Base boards | |
Material | The framed substrate must be sheathed using a Wetherby approved sheathing board ensuring that they achieve minimum pull out requirements to be suitable for the systems application. |
Fixings | Fix in accordance with site conditions and manufacturer's instructions. |
Insulation | |
Material | Stone wool insulation.Guidance for specification option: - Board size: 1200 x 600 mm. - Minimum compressive strength: 10 kPa. - Thermal conductivity: 0.036 Wm²/K.
- Fire performance: - Class A1 (BS EN 13501-1:2002). - Non-combustible.
- Environmental: - CFC/ HCFC free. - Zero ODP. - GWP less than 5. |
Fixings | TKR screw range.R-QCP screw range.Manufacturer guidanceThe stone wool insulation boards are mechanically fixed with WBS approved fixings, combined with a suitable washer. The fixings frequency, type and length are subject pull-out tests and wind load calculations. |
Fire barriers and stops | |
Material | Tenmat intumescent strip.Guidance for specification option: Intumescent strips should be mechanically fixed at agreed locations to form horizontal and if specified vertical fire breaks in the cavity. Tenmat NVFB fire barrier.Guidance for specification option: Vertical cavity closer and cavity closers around openings (where required). |
Fixings | JT3-FR6 stainless steel screw.Guidance for specification option: Typically used to fix NVFB fire barriers to their agreed locations (sheathing board/ framed substrate). Manufacturer guidanceFixing type, length and frequency all subject to pull out tests, job specific detailing/requirements and wind load calculations. Contact manufacturer for further information. |
Movement joints | |
Form with | WBS stainless steel movement joints.WBS PVC movement joints.WBS stainless steel surface mounted render stop beads.WBS PVC surface mounted render stop beads.Manufacturer guidanceAll structural movement joints must be mirrored through the EWI System. As a minimum, incorporate the movement joints every 7–10 m vertically and at every other floor level horizontally. Structural Engineers will be required to confirm how much movement will occur and where movement joints are located in the substrate. |
Sealant | Compriband sealing tape between the insulation boards.Guidance for specification option: Where movement joints are required. |
Render carrier or reinforcement | |
Material | Glass fibre reinforcement mesh incorporated into bedding adhesive. |
Mesh size | Manufacturer guidance50 m² roll. |
Fixings | R-UCF Range - stainless steel screw.Guidance for specification option: Combined with a suitable stainless steel washer. Manufacturer guidanceSecondary mechanical fixings are required on all projects two storeys and above at a rate of 1 per m² as per BRE Report BR135:2013. NHBC require in all cases that a minimum of one non-combustible fixing is installed through the reinforcement mesh per insulation board, in addition to other fixings. |
Render | |
Application | Primer and finish coat. |
Material | Heck silicone primer and Heck silicone render finish. |
Decorative finish | |
Colour | Manufacturer guidanceAny NCS or RAL reference. Insert requirements. |
Protective coating | None.Aspira render protector.Guidance for specification option: Optional. |
System accessories | None.WBS APU bead.WBS EVO-STIK silicone sealant.WBS end caps.WBS firtree fixings.WBS jointing pieces.WBS sealing tape.Guidance for specification option: Pre-compressed, expanding waterproof sealing tape. |
Samples required | None.Submit samples of textured Wetherby silicone finish for approval. Keep approved samples on site for the duration of the contract for inspection and comparison purposes.Manufacturer guidanceThe manufacturer offers a product sample service, providing a small sample of the finished build-up, colour and texture before a final decision is made. Contact the manufacturer for further information. |
Execution | Install system as per manufacturer’s instructions. |
System completion | Inspection of completed installation.Documentation for insulated render systems.Removal of samples.Verification of performance.O & M manuals and data sheets relevant to the system installed. |
Contains Red List materials | No |
Country of material origin | Europe |
Country of product manufacture | Europe |
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