External Wall Insulation (EWI) is the application of an insulation layer to the outside wall of a building in order to improve the building’s energy efficiency.

By minimising heat loss in cold weather and heat gain in warm weather, EWI creates a much more comfortable living environment and reduces heating costs.

EWI is a composite system made up of three basic components: an insulate, a fixing, and a render or cladding. The insulate is secured to the wall using either special adhesives or purpose-made fixing screws/dowels. The final surface, which provides both the aesthetic and weatherproofing functions of the wall, is usually a coloured render but could also be a brick effect or other specialist finish.

A range of EWI systems are available allowing the building owner to prioritise between cost and technical performance.

SILICONE & ACRYLIC FINISH

SILICONE & ACRYLIC FINISH

A base coat render is applied at a minimum thickness of 8mm. This is ruled to provide a flat surface. A primer coat is then applied followed by an acrylic finish at 1-2mm.

SCRATCH RENDER

SCRATCH RENDER

This product is applied over a base coat render at approximately 10mm thickness. The surface is then scratched back using a nail float resulting in a textured finish.

BRICK EFFECT RENDER

BRICK EFFECT RENDER

Two or three coat brick effect render, used to simulate the appearance of brickwork. A coloured mortar coat is trowel applied and the top coat is applied in a contrasting colour whilst still soft. This is then carefully set out and cut back using a specialist cutting tool.

DRY DASH FINISH

DRY DASH FINISH

A coloured render coated with a spar dash finish. A wide range of aggregates in various colours can be used to dash the surface, which is applied at 8mm whilst the render is still soft.

wall insulation - brick slips

BRICK SLIPS

Giving the traditional feel of a building, Brick Slips are produced by removing the face of existing bricks thus achieving genuine brick effect finish.

All of these services are available in various colours.
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S J Donnelly Ltd is approved applicators Wetherby, Insuletics, Structherm.
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