British Standards Institution

Source:: BSI
Committee:: PRI/72 - Rigid cellular materials
Categories:: Information management | Standardization. General rules | Manufacturing | Cellular materials | Thermal insulation

Scope

BS 7456 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 the maximum width of 150 mm of suitably constructed external walls of maximum continuous cavity height of 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. Note: Walls built of random rubble are not covered by this code.

Purpose

BS 7456 specifies a study of all relevant drawings, if available, concerning the building structure, identification of any gaps which will allow the polyurethane foam system to escape from the cavity (e.g., gaps around windows, skirting boards, and at the top of cavities) and an inspection of the cavities using a borescope to assess. Overall, BS 7456 defines what are suitably constructed external walls and indicates essential procedures and precautions necessary to optimise the filling process.

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Please email further comments to: debbie.stead@bsigroup.com

Standard timeline

1. Proposal

Proposal start date:

26/10/2023

Proposal end date:

21/12/2023

2. Draft

3. Public Comments

4. Comment Resolution

5. Approval

6. Publication

Learn more about the standards development process

Standards Development

Proposed withdrawal of BS 7456:1991 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

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