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Epsitec Stone Wool Insulation Systems - PS4 & PS5

Verified by manufacturer over a year ago

BBA 09-4625 PS4 - Timber Frame

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

    BBA Agrément Certificate

    Certificate type

External wall insulation systems for steel and timber-framed buildings.

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Application

  • Suitable for use, with height restriction, on new or existing domestic and non-domestic buildings.
  • The systems are not subject to any restriction on proximity to boundaries.
  • BBA 09-4625 PS4 - Timber Frame is restricted for use in buildings up to 18 m in height (see section 4.3 of BBA Certificate).
  • BBA 09-4625 PS5 - Steel Frame is restricted for use in buildings with no storey above 18 metres when using timber battens (see section 4.3 of BBA Certificate).

Description

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.

General information

Finish

Silicone

Material

Stone wool

Silicone

Shape

Other

Length

Bespoke

Width

Bespoke

Height

Bespoke

Warranty description

Ten year

Uniclass

Ss_25_45_72_70 Rail-fixed external wall insulation systemsPrimary

CAWS

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

M21/210 External wall insulation system

Specification data - Rail-fixed external wall insulation systems

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 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.

WBS Biocidal Wash.

Manufacturer guidance

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 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 guidance

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.

Bracket fixings

R-QCP.

Manufacturer guidance

The 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 guidance

The 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 guidance

Fixing 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 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

Glass fibre reinforcement mesh incorporated into bedding adhesive.

Mesh size

-

Manufacturer guidance

50 m² roll.

Fixings

R-UCF Range - stainless steel screw.

Guidance for specification option:

Combined with a suitable stainless steel washer.

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

-

Application

Primer and finish coat.

Material

Heck silicone primer and Heck silicone render finish.

Decorative 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 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 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.

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.

Sustainability data

Contains Red List materials

No

Country of material origin

Europe

Country of product manufacture

Europe

Third party certifications

BBA Agrément Certificate

BBA Agrément Certificate

Epsitec Stone Wool External Wall Insulation System for Steel Framed Building 09/4625 - PS5

BBA Agrément Certificate

BBA Agrément Certificate

Epsitec Stone Wool External Wall System for Timber Framed Buildings 09/4625 - PS4

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