Provisions meeting the performance

  1. Urea formaldehyde (Uf) foam
    1. Technical solution

    Urea formaldehyde (Uf) foam

    1.1Insulating materials which give off formaldehyde fumes (either when used or later in normal use) may be used to insulate the cavity in a cavity wall where there is a continuous barrier which will minimise as far as practicable the passage of fumes to the occupiable parts.

    Technical solution

    1.2A cavity wall may be insulated with UF foam where:

    • athe inner leaf of the wall is built of masonry (bricks or blocks); and
    • bthe suitability of the wall for foam filling is assessed before the work is carried out in accordance with BS 8208-1:1985 Guide to assessment of suitability of external cavity walls for filling with thermal insulants. Existing traditional cavity construction; and
    • cthe person carrying out the work holds (or operates under) a current Certificate of Registration of Assessed Capability for the work he is doing; and
    • dthe material is in accordance with the relevant recommendations of BS 5617:1985 Specifications for urea formaldehyde (UF) foam systems suitable for thermal insulation of cavity walls with masonry or concrete inner and outer leaves; and
    • ethe installation is in accordance with BS 5618:1985 Code of practice for thermal insulation of cavity walls (with masonry or concrete inner and outer leaves) by filling with urea formaldehyde (UF) foam systems.