External Wall Insulation

External wall insulation refers to a layer of insulation that’s fixed to the outside of an existing wall. This layer will be finished either with a coat of render or with an alternative cladding material to protect it from the elements.

This is now a common method of insulating walls used by those with solid walls, where cavity wall insulation is impossible. That said there are some other situations where external wall insulation make sense.

External wall insulation is generally regarded as the most efficient form of wall insulation because the insulation is continuous without interruptions from internal walls etc. so there’s less risk of thermal bridging, cold spots and mould.

It should also provide better airtightness. When compared to internal drylining, there’s also no loss of floor space to worry about and relatively little disruption. Also, it has the added benefit of making out dated buildings look modern and fresh.

Key benefits include

Reduces heat loss and energy bills

Fewer draughts and increased comfort

No internal disruption during installation

Does not reduce internal floor area

Allows walls to contribute to thermal mass

(the ‘tea cosy’ effect)

Improves not only weatherproofing

but sound resistance too

Increases the life of the wall

Reduces condensation on internal walls