Epsibrick External Wall Insulation System - PS1

Thermal Performance.

Guidance for specification option:

The systems can improve the thermal performance of external walls and can contribute to satisfying the requirements of the National Building Regulations.

Strength and Stability.

Guidance for specification option:

The systems can adequately resist wind loads and impact damage.

System Tested to BS EN 13501-1:2018.

Guidance for specification option:

Achieved a value of B-s1, d0 reaction to fire.

Risk of Condensation.

Guidance for specification option:

The system can contribute to a limiting risk of interstitial and surface condensation.

Durability.

Guidance for specification option:

When installed and maintained in accordance with the Certificate holders recommendations and this Certificate, the system will remain effective for at least 30 years.

Further Information.

Guidance for specification option:

For further information on the above points please visit the system’s BBA Certificate.

Remove any loose material and existing render, where required dub out the surface level, ready to receive the EWI system. The existing walls are to be cleaned with a wire brush or pressure jet wash, to the satisfaction of the Contract Administrator, to remove any friable material, algae or lichen, and to provide a good key for Wetherby products. Treat areas of moss, algae and mould growth with WBS Biocidal Wash. Dense smooth surfaces may require treating with WBS Stabilising Solution / Bonding Agent to ensure adequate adhesion on wet fix or render only applications. If the walls include existing render or the substrate isn’t line and level and requires dubbing out, the fixing lengths stated within this specification may need to change. 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. Where necessary dub out, using Wetherby Dubbing Render, any hollow / defective areas to leave a suitable surface for the application of the insulation boards. Maximum dubbing coat thickness: 16mm. Where required, apply one coat of Wetherby Biocidal Wash to the entire surface by roller or knapsack spray and allow to dry. Brush the surface to remove all signs of growth before rendering commences. Where required, apply one coat of Wetherby Stabilising Solution to the entire surface by roller, ensuring uniform coverage and allow to dry.

WBS Aluminium Base Rail.

Guidance for specification option:

Securely fix Wetherby BSR starter track above DPC level at base of the system. Mechanically fix starter track at max. 300 mm centres, 50 mm from each end. WBS 3756 base rail connectors should be used to join the tracks, packing shims may be required to ensure the starter track is true to line and level. Any gaps behind the basetrack allowing free air movement behind the insulation should be sealed appropriately.

WBS HIT 6/5 Hammerscrew Bead Fixing.

Enhanced EPS 70E.

Guidance for specification option:

Thermal Performance of the board is 0.032, 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.

-              Performance in Relation to Fire:

-              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:

Thermal Performance of the board is 0.030, 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.

-              Performance in Relation to Fire:

-              Flame Retardant Grade.

-              Class E (BS EN 13501-1:2002).

-              Environmental:

-              CFC / HCFC Free.

-              Zero ODP.

-              GWP Less Than 5. 

WBS Insulation Bedding Adhesive (if required).

Guidance for specification option:

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. 

Lamella Insulation.

Guidance for specification option:

Adhesively and mechanically fix fire breaks using a minimum of 4 stainless steel fixings per board. Fire breaks to be installed horizontally and vertically at agreed locations and dubbed out 10 mm to main insulant with scrim adhesive. Bed alkali resistant mesh into scrim adhesive, overlapping main insulant by 100 mm minimum as per WBS detail drawing.

TID-MR Range.

Guidance for specification option:

Typically used to fix fire barriers to their agreed locations.

DHM Range.

Guidance for specification option:

Typically used to fix fire barriers to their agreed locations.

Compriband sealing tape installed between the insulation boards.

Glass fibre reinforcement mesh incorporated into scrim adhesive.

Brick Slip Adhesive.

Guidance for specification option:

Trowel apply full spread of Brick Slip Adhesive to the scrim adhesive. Use a 10 mm notched trowel to ensure minimum 5 mm thickness is achieved.

WBS 7–15 mm Brick Slips.

Guidance for specification option:

WBS Brick Slips should be cleaned before application ensuring all slips are free of residue. Whilst the brick slip adhesive is wet the brick slips can be firmly pushed into the adhesive. Brick slips should be installed line and level and staggered leaving a consistent joint.

NB. Brick Slips are manufactured using raw natural ceramics and will inevitably vary in nature. Natural variations in colour, texture and dimensions may be present. It is advisable to mix slips from at least 5 boxes to minimise grouping of colours. Any product deemed faulty or out of tolerance should not be applied and should be reported to Wetherby immediately. 

WBS Pointing Mortar.

Guidance for specification option:

Once brick slips have set, point up with WBS Pointing Mortar using a pointing gun. Shape mortar to desired joint type using a pointing trowel. Care should be taken not to apply WBS Pointing Mortar onto the brick slip face or pistols as this can be very difficult to remove. Once pointing mortar is dry, brush down the wall to remove all loose mortar etc.

WBS Sealing Tape: Pre-compressed, expanding waterproof sealing tape.

WBS Firtree Fixings.

WBS Jointing Pieces.

WBS End Caps.

WBS EVO-STIK Silicone Sealant.

Submit samples of Wetherby Brick Slips for approval. Keep approved samples on site for the duration of the contract for inspection and comparison purposes. The manufacturer offers a product sample service, providing a small sample of the finished build-up, colour and brick slip type before a final decision is made. Contact the manufacturer for further information.

Inspection of completed installation.

Documentation for insulated render systems.

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