A KIWA BDA certified external thermal insulation composite system consisting of either vertical timber battens or cavity spacer rails, enhanced EPS insulation board, base-coated, meshed, finished with dash receiver and dashing stone finish.

Features and benefits:

Moisture control contribute to limiting the risk of interstitial and surface condensation.
Will resist wind-driven rain penetration across the partially ventilated cavity to the supporting wall.
Designed to adequately resist impact damage and wind loads normally encountered in the UK.
Classified as European class B-s1, d0 in accordance with BS EN 13501-1.
Improves the thermal performance of external walls and can contribute to satisfying the requirements of the National Building Regulations.
Service life durability of the System will depend on the environment (operating conditions) in which the System will be used.

Preparation:

All sheathing boards must achieve minimum pull out requirements to be suitable for the system application.
The substrate to receive the WBS system must be completely dry and not damaged by rain/ frost to reduce the board performance in any way.
The board manufacturer should be consulted and pull-out tests redone before continuing if rain/ frost damage is evident.
The substrate shall be clean and structurally sound.
Sheathing boards /panel substrates should be line and level ensuring RagRails can 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.
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.
Where packing out of the RagRail or Timber Batten is required, the fixing lengths may need to be increased. This will need to be confirmed on site prior to the installation of the Wetherby system.
All sheathing boards must be securely fixed, correctly jointed and sealed (where required) as per the board manufacturer instructions.
Treatment to Existing Timber/ 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.