ABSTRACT
This Approved Document contains just one requirement, which deals with the health risk of cavity wall insulating materials that give off formaldehyde fumes.
The technical solution offered in the Approved Document seeks to minimize, as far as is practicable, the passage of fumes to the occupied parts of the building. A cavity wall may be insulated with urea-formaldehyde foam subject to the following provisions:
• The inner leaf should be built of bricks or blocks. • The cavity wall should be assessed, before filling, in accordance with
BS 8208: Guide to assessment of suitability of external cavity walls for filling with thermal insulants Part 1: 1985 Existing traditional cavity construction.
