Name: Epsiwall External Wall Insulation System - PS2
Brand: Wetherby Wall Systems Ltd | Part of ROCKWOOL Group
SKU: 27SW9qDULf686Hcphejvu6

Finish

Textured

Material

Silicone

Expanded polystyrene (EPS)

Uniclass

Ss_25_45_72_28 External wall insulation systemsPrimary

CAWS

M21/210 Rendered external wall insulation systems

M21/20 External wall insulation systems

System performance

Durability - 30 years; Fire performance to BS EN 13501-1, class B-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, class B-s1, d0.

Guidance for specification option:

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.

Manufacturer guidance

The 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.

Wetherby Dubbing Render.

Guidance for specification option:

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.

Guidance for specification option:

Treat areas of moss, algae and mould growth with WBS Biocidal Wash.

WBS Stabilising Solution.

Guidance for specification option:

Dense smooth surfaces may require treating with WBS Stabilising Solution / Bonding Agent to ensure adequate adhesion on wet fix or render only applications.

Manufacturer guidance

Remove any loose material and existing render.

Support rails and brackets

Fixing method

Material

WBS base rail.

Bracket fixings

WBS HIT 6/5 hammerscrew bead fixing.

Guidance for specification option:

Mechanical fixing.

Insulation

Material

Enhanced EPS 70E.

Guidance for specification option:

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.

Guidance for specification option:

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.

Guidance for specification option:

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.

Adhesive

Required.

Not required.

Manufacturer guidance

Insulation 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.

Additional mechanical fixings

SPIT ISO range.

T-FIX-8M range.

T-FIX-8S range.

Manufacturer guidance

The 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.

Fire barriers and stops

Material

Lamella insulation.

Fixings

TID-MR range.

DHM range.

Manufacturer guidance

Fixing 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.

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 guidance

All 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

WBS Alkali-resistant scrim cloth incorporated into bedding adhesive.

Mesh size

50 m².

Manufacturer guidance

Roll.

Fixings

TID-MR range.

DHM range.

Manufacturer guidance

Secondary 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

Material

Heck silicone primer.

Heck silicone render finish.

Colour

Manufacturer guidance

Any NCS or RAL reference. Insert requirements.

Protective coating

None.

Aspira render protector.

Guidance for specification option:

Optional.

System accessories

None.

WBS sealing tape.

Guidance for specification option:

Pre-compressed, expanding waterproof sealing tape.

WBS firtree fixings.

WBS jointing pieces.

WBS end caps.

WBS EVO-STIK silicone sealant.

WBS APU bead.

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 guidance

The 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.