BS 7456:1991
Withdrawn
A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.
Hardcopy , PDF
01-02-2024
English
09-30-1991
Committees responsible
Foreword
Code of practice
0. Introduction
1. Scope
2. Definitions
3. Suitability of cavity walls
4. Polyurethane foam system
5. Thermal performance of installed polyurethane
foam
6. Pre-installation preparation of the building
7. Filling process
8. Installation of the polyurethane foam system
9. Post-installation activities
10. Declaration
11. Records
Appendices
A. Criteria of suitability of external cavity walls
B. Fire performance of polyurethane foam when
installed in a wall cavity
C. Notes for designers
D. Flue checks for appliances of rated input not
exceeding 60 kW
E. Methods for determining cavity width
Figures
1. Staggered drilling pattern (representing maximum
spacing)
2. Elevations of semi-detached property: unit area
plan for injection
3. Overall pattern of filling for a nominal 50 mm
wide cavity
4. Measurement of cavity width
5. Estimation of cavity width
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