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Epsitec External Wall Insulation Systems - PS1 & PS3 - External Wall Insulation Silicone Render

Verified by manufacturer 3 months ago

Wetherby Building Systems Ltd Third party certifications:
  • BBA Agrément Certificate

    BBA Agrément Certificate

    Certificate type

External wall insulation system for steel and timber framed buildings.

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+44 (0)1942 717100 Website

Application

Suitable for use, with height restrictions, on new or existing domestic and non-domestic buildings.

Description

The Epsitec External Wall Insulation System for steel and timber framed buildings, comprising mechanically fixed phenolic, expanded polystyrene (EPS) or enhanced EPS insulation boards, with basecoat and glassfibre reinforcement mesh applied over the top, primed and finished in a silicone texture.

General information

Color

Other

Can be tinted to any NCS or RAL reference.

Finish

Textured

Material

Expanded polystyrene (EPS)

Silicone

Warranty description

Ten year

Uniclass

Ss_25_45_72_70 Rail-fixed external wall insulation systemsPrimary
Ss_25_45_72_70 Rail-fixed external wall insulation systemsPrimary

CAWS

M21/210 External wall insulation system

M21/20 External wall insulation system . . . . . .

Specification data - Rail-fixed external wall insulation systems

System performance

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.

Durability - 30 years; Fire performance to BS EN 13501, 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.

This system also has a 60-year life expectancy when installed to BOPAS requirements. 

Preparation

Ensure 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 also require alterations.

Existing timber or steel cladding - remove any defective areas of the existing substrate and where required make repairs to ensure the surface is ready to receive the EWI system. Clean the existing walls 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.

Not required.

WBS Biocidal Wash.

Support rails and brackets

-

Material

The 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.

15 mm RagRail cavity spacer rails.

25 mm RagRail cavity spacer rails.

25 mm Timber battens.

Bracket fixings

The fixings of the rail/ battens will need to be appropriate for the substrate that the system will be installed over. Fixings and their frequency will be subject to pull out tests and wind load calculations

LS 5.5 screw range.

R-QCP screw range.

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 boards in accordance with site conditions and manufacturer's instructions.

Insulation

-

Material

Phenolic insulation boards.

A highly performing insulation board. Thicknesses compatible with the system’s certification range between 40–120 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 thickness of board).

Fire performance:

  • Flame retardant grade.
  • Class 0 Rating (Low Risk) classified by Building Regulations.

Environmental:

  • CFC/ HCFC free.
  • Zero ODP.
  • GWP less than 5.

White EPS.

Thicknesses compatible with the system’s certification range between 50–240 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/ HCFC free.
  • Zero ODP.
  • GWP less than 5.

Epsitherm 70E.

Thicknesses compatible with the system’s certification range between 50–240 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.

Epsitherm 90E.

Thicknesses compatible with the system’s certification range between 50–240 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/ HCFC free.
  • Zero ODP.
  • GWP less than 5.

Fixings

The enhanced EPS boards are mechanically fixed with WBS approved fixings. The phenolic insulation boards must instead be initially fixed. These fixings must also be combined with a suitable cap/ washer. The fixings frequency, type and length would be subject pull-out tests and wind load calculations. 

TKR screw range.

R-QCP screw range.

Fire barriers and stops

-

Material

Stone wool/ lamella fire barriers.

For this system, fire barriers are typically installed 10 mm less than the main insulant and require a minimum of four stainless steel fixings per board as a minimum. Extra rails/ battens may be required when installing the fire barriers horizontally to ensure the board are fully supported. All NFVB fire barrier in the cavity must be compressed by the stone wool insulation.

Tenmat intumescent strips.

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.

Tenmat NVFB Non-Ventilated Fire Barrier - Vertical cavity closer and cavity closer around openings (where required).

Fixings

Fixing type, length and frequency all subject to pull out tests, job-specific detailing/ requirements and wind load calculations. For fixing lamella and stone wool fire barriers, an adequate stainless steel washer will be required. Contact manufacturer for further information.

TKE screw range.

Typically used to fix fire barrier and intumescent strips to their agreed locations (rail/ sheathing board/ steel frame).

R-UCF screw range.

Typically used to fix fire barriers to their agreed locations (Timber Batten / Sheathing Board/ Timber Frame).

JT3-FR6 screw range.

Typically used to fix NVFB fire barriers to their agreed locations.

Movement joints

-

Form with

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.

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 size

Roll.

50 m².

Fixings

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.

TKE screw range.

Typically used for fixing into steel substrates.

R-UCF screw range.

Typically used for fixing into timber substrates.

TKR screw range.

Combined with the relevant cap/ washer this fixing is typically used for the main fixings installed through the mesh for the phenolic system. Normally specified when fixing into the RagRail. 

R-QCP screw range.

Combined with the relevant cap/ washer this fixing is typically used for the main fixings installed through the mesh for the phenolic system. Only specify when fixing into the timber batten. 

Render

-

Application

Primer and finish coat.

Material

Heck Silicone Primer and Heck Silicone Render Finish.

Decorative finish

-

Colour

Can be tinted to any NCS or RAL reference. Insert requirements.

-

Protective coating

None.

Aspira render protector.

Optional.

System accessories

None.

WBS APU bead.

WBS end caps.

WBS fire rated silicone sealant.

WBS firtree fixings.

WBS jointing pieces.

WBS sealing tape.

Pre-compressed, expanding waterproof sealing tape.

WBS approved silicone sealant.

Samples required

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.

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.

Removal of samples.

Verification of performance.

O & M manuals and data sheets relevant to the system installed.

Sustainability data

Country of material origin

Europe

Country of product manufacture

Europe

Embodied carbon

A1-A3 (production stage) as defined in BS EN 15804

Guidance:

Please refer to individual product data sheets.

-

Recyclability

Please refer to individual product data sheets.

-

Recycled content

Please refer to individual product data sheets.

-

BIM objects

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Platform Compatible Version
IFC
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2

Revit
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3

Third party certifications

BBA Agrément Certificate

BBA Agrément Certificate

Epsitec External Wall Insulation System for Steel Framed Buildings 09/4625 - PS1

BBA Agrément Certificate

BBA Agrément Certificate

Epsitec External Wall Insulation Systems for Timber Framed Buildings 09/4625 PS3

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