External Wall Insulation Process

External Wall Insulation at the Green Deal House

External Wall Insulation at the Green Deal House

To insulate a solid wall from the outside, a layer of insulation material is fixed to the walls with mechanical fixings and adhesive, then covered with protective layers of render or cladding.

The finish can be smooth, textured or painted, tiled, panelled, pebble-dashed (for easy maintenance) or finished with brick slips to provide a real masonry brick finish. 

The finish will cover the whole of the outside of your property, including existing brickwork, and may change its appearance. So you must find out if you need planning permission.

To prevent condensation, recessed areas around windows must be insulated as well as the walls – with the depth of insulation depending on the width of the window frame.

All external pipework and other fittings will have to be removed and replaced, and it may be necessary to extend window sills and even the roof overhang to protrude beyond the new layer. It is often possible to fit additional sills to avoid replacing any of the original structure.

For more details visit the Energy Savings Trust.

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