A blog post

The dangers of Cavity Wall Insulation and damp

Posted on the 28 August, 2009 at 4:26 pm Written by in Case Studies, Cavity Walls, Damp

This 1976 brick built Dorset bungalow retained blown fibre insulation introduced in the late 1990’s.

Wall showing rain penetration

Wall showing rain penetration

Rain penetration penetrated the outer masonry and bridged the cavity causing internal decorative spoling and decay to skirting boards. Moisture entrapped within the cavity wall is clearly visible at DPC level externally and is aggravated by very hard impermeable motar.
Saturated perp end joint

Saturated perp end joint

The seriousness of this particular problem became apparent when drilling the perp end joints which were saturated.
Saturated motar between the brick work

Saturated motar between the brick work

Saturated mortar from between the brickwork.
Moisture squeezed from the insulation material

Moisture squeezed from the insulation material

Moisture squeezed from a sample of the insulation material removed.
Remedial costs to remove the insulation and make good, excluding internal repairs and redecoration, was in excess of £2000 plus VAT

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