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  • BSI
    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
    Edition: 1991
    $316.70
    / user per year

Description of BS 7456:1991 1991

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.



Optimum procedure for insulating masonry cavity walls.

Standard NumberBS 7456:1991
TitleCode 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
StatusWithdrawn
Publication Date1991-09-30
Withdrawn Date2024-01-02
DescriptorsInstallation, Position, Foams, Records (documents), Thermal insulating materials, Cavity walls, Polymers, Construction materials, Width measurement, Preparation, Holes, Flues, Polyurethane, Thermal insulation, Plastics, Safety measures
ICS91.120.10 Thermal insulation of buildings
CommitteeB/540
ISBN0 580 19791 3
PublisherBSI
Pages18

About BSI

BSI Group, also known as the British Standards Institution is the national standards body of the United Kingdom. BSI produces technical standards on a wide range of products and services and also supplies certification and standards-related services to businesses.
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