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Masonry Cavity Wall Insulation Details

The details within this section have been developed for a range of partial and fully filled cavity wall constructions.

For this form of construction, details are given for the junctions with a range of roof, ground floor, and internal floor types, in addition to details around window openings.

Insulation thicknesses for main building element have not been provided as these depend on the thermal properties of the materials chosen, together with the proposed U-value.

All details are shown with a brick outer leaf for simplification. However, other types of masonry materials may be used as a substitution, without any loss of thermal performance or increased technical risk- such as blockwork with render, tile hanging or weather boarding.

The suitability of full fill cavity construction is dependant on the exposure of the site and the nature of the outer leaf. Further information is given in BR262 ‘Thermal Insulation: Avoiding Risks’, NHBC Standards, and Zurich Building Guarantees Technical Manual.