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BS 7456:1991

Withdrawn
Withdrawn

A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.

Code of practice for stabilization and thermal insulation of cavity walls (with masonry or concrete inner and outer leaves) by filling with polyurethane (PUR) foam systems
Available format(s)

Hardcopy , PDF

Withdrawn date

01-02-2024

Language(s)

English

Published date

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

Optimum procedure for insulating masonry cavity walls.

This British Standard gives recommendations for the installation of rigid polyurethane (PUR) foam systems complying with BS 7457:1994, which are dispensed on site, to fill cavities of maximum width 150 mm of suitably constructed external walls of maximum continuous cavity height 12 m which have masonry or concrete inner and outer leaves, thereby providing additional thermal insulation to such walls and simultaneously, especially in the case of walls with damaged wall ties, improving their structural integrity.

It defines what are suitably constructed external walls and indicates essential procedures and precautions necessary to optimise the filling process. Walls built of random rubble are not covered by this code.

NOTE The titles of the publications referred to in this standard are listed on the inside back cover.

Committee
B/540
DevelopmentNote
Supersedes 88/43769 DC and 92/46448 DC (10/2005) Reviewed and confirmed by BSI, November 2012. (10/2012)
DocumentType
Standard
Pages
18
PublisherName
British Standards Institution
Status
Withdrawn
Supersedes

S.R. 325:2013+A2:2018/AC:2019 RECOMMENDATIONS FOR THE DESIGN OF MASONRY STRUCTURES IN IRELAND TO EUROCODE 6
BS 5628-3:2005 CODE OF PRACTICE FOR THE USE OF MASONRY - PART 3: MATERIALS AND COMPONENTS, DESIGN AND WORKMANSHIP
BS 5628-3:2001 Code of practice for use of masonry Materials and components, design and workmanship
BS 7457:1994 Specification for polyurethane (PUR) foam systems suitable for stabilization and thermal insulation of cavity walls with masonry or concrete inner and outer leaves
05/30131954 DC : DRAFT APR 2005 BS 5628-3 - CODE OF PRACTICE FOR THE USE OF MASONRY - PART 3: MATERIALS AND COMPONENTS, DESIGN AND WORKMANSHIP
10/30168896 DC : 0 PD 6697 - RECOMMENDATIONS FOR THE DESIGN OF MASONRY STRUCTURES TO BS EN 1996-1-1 AND BS EN 1996-2
PD 6697:2010 Recommendations for the design of masonry structures to BS EN 1996-1-1 and BS EN 1996-2

BS 7457:1991 Specification for polyurethane (PUR) foam systems suitable for stabilization and thermal insulation of cavity walls with masonry or concrete inner and outer leaves
BS 5750-2:1987 Quality systems Specification for production and installation
BS 5628-3:1985 Code of practice for use of masonry Materials and components, design and workmanship
BS 8208-1:1985 Guide to assessment of suitability of external cavity walls for filling with thermal insulants Existing traditional cavity construction
BS 6336:1982 Guide to development and presentation of fire tests and their use in hazard assessment

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