Verified by manufacturer 26 days ago
BBA Agrément Certificate
Certificate type
A masonry BBA certified system consisting of two different types of insulation boards (enhanced EPS and phenolic), basecoated, meshed and finished off using a thin coat silicone texture.
Suitable for use on the outside of external masonry walls of new or existing domestic and non-domestic buildings, with height and boundary restrictions.
The Epsiwall External Wall Insulation System, comprising mechanically fixed grey enhanced expanded polystyrene (Epsitherm 70E and 90E) or phenolic (PF) insulation boards, with supplementary adhesive where required (adhesive is compulsory when using phenolic insulation), a reinforced basecoat and render finishes.
Finish | Textured |
Material | Silicone Expanded polystyrene (EPS) |
Uniclass | |
CAWS | M21/210 External wall insulation system M21/20 External wall insulation system . . . . . . |
System performanceThe 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. | Durability - 30 years; Fire performance to BS EN 13501-1, class B-s1, d0.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, class B-s1, d0.The durability can be extended to 60 years by using different fixings and supplementary adhesive, and by following a planned inspection and an effective maintenance schedule as described in sections 12 and 13 of the systems BBA certificate. |
PreparationRemove any loose material and existing render. | Not required.Wetherby Dubbing Render.Where necessary dub out any hollow or defective areas to leave a suitable surface for the application of the insulation boards. Maximum coat thickness 16 mm. WBS Biocidal Wash.Treat areas of moss, algae and mould growth with WBS Biocidal Wash. WBS Stabilising Solution.Dense smooth surfaces may require treating with WBS Stabilising Solution / Bonding Agent to ensure adequate adhesion on wet fix or render only applications. |
Support rails and brackets | - |
Fixing method | - |
Material | WBS base rail. |
Bracket fixings | WBS HIT 6/5 hammerscrew bead fixing.Mechanical fixing. |
Insulation | - |
Material | Enhanced EPS 70E.Thicknesses compatible with the system’s certification range between 40–240 mm.
- Board size: 1200 x 600 mm. - Density: 15 kg/m³. - Minimum compressive strength: 70 KN/m². - Thermal conductivity: 0.032 Wm²/K.
- Fire performance: - Flame retardant grade. - Class E (BS EN 13501-1:2002).
- Environmental: - CFC/ HCFC free. - Zero ODP. - GWP less than 5. Enhanced EPS 90E.Thicknesses compatible with the system’s certification range between 40–240 mm.
- Board size: 1200 x 600 mm. - Density: 18 kg/m³. - Minimum compressive strength: 100 KN/m². - Thermal conductivity: 0.030 Wm²/K.
- Fire performance: - Flame retardant grade. - Class E (BS EN 13501-1:2002).
- Environmental: - CFC and HCFC free. - Zero ODP. - GWP less than 5. Phenolic.Thicknesses compatible with the system’s certification range between 60–120 mm.
- Board size: 1200 x 600 mm. - Density: 40 kg/m³. - Minimum compressive strength: 150 KN/m². - Thermal conductivity: 0.021–0.023 Wm²/K (dependent on the thickness of the board).
- Fire performance: - Class C-s1, d0.
- Environmental: - CFC and HCFC free. - Zero ODP. - GWP less than 5. |
AdhesiveInsulation boards can be mechanically and adhesively fixed or mechanical only. If a plastic pin fixing is used a minimum of 40% of bedding adhesive must be applied to the back of the boards. If a metal pin fixing is used, then bedding adhesive will not be required. If phenolic insulation boards are specified, the boards must be fully bedded and mechanically fixed. | Required.Not required. |
Additional mechanical fixingsThe Enhanced EPS Boards are mechanically fixed with WBS approved fixings. Fixing of the phenolic insulation boards may require fixing through the mesh, contact manufacturer for further information. The fixings frequency, type and length are subject pull-out tests and wind load calculations. | SPIT ISO range.T-FIX-8M range.T-FIX-8S range. |
Fire barriers and stops | - |
Material | Lamella insulation. |
FixingsFixing type, length and frequency are all subject to pull-out tests, job-specific detailing and requirements and wind load calculations. Please contact manufacturer for further information. | TID-MR range.DHM range. |
Movement joints | - |
Form withAll 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. | WBS stainless steel movement joints.WBS PVC movement joints.WBS stainless steel surface mounted render stop beads.WBS PVC surface mounted render stop beads. |
Sealant | Compriband sealing tape between the insulation boards.Where movement joints are required. |
Render carrier or reinforcement | - |
Material | WBS Alkali-resistant scrim cloth incorporated into bedding adhesive. |
Mesh sizeRoll. | 50 m². |
FixingsSecondary 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. | TID-MR range.DHM range. |
Render | - |
Material | Heck silicone primer.Heck silicone render finish. |
ColourAny NCS or RAL reference. Insert requirements. | - |
Protective coating | None.Aspira render protector.Optional. |
System accessories | None.WBS sealing tape.Pre-compressed, expanding waterproof sealing tape. WBS firtree fixings.WBS jointing pieces.WBS end caps.WBS EVO-STIK silicone sealant.WBS APU bead. |
Samples requiredThe 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. | 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. |
System completion | Inspection of completed installation.Documentation for insulated render systems.O&M manuals and data sheets relevant to the system installed. |
NBS BIM object standard
This BIM object has been authored to meet the requirements of the NBS BIM object standard.
Find out more about the NBS BIM object standard.
Platform | Compatible | Version |
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