What is BS 5642-1 - Precast concrete, cast stone, clayware, slate, and natural stone window sills specifications about?
BS 5642-1 is the first part of the multiple series that specifies requirements for window sills of precast concrete, cast stone, clayware, slate and other natural stone for use with windows complying with the requirements of BS 644, BS 6510 and BS 4873.
Note 1: BS 5642-1 does not cover masonry units conforming to the requirements of BS EN 771 (all parts).
Note 2: Cast stone units not containing reinforcement or fixings and not exceeding 650 mm in any co-ordinating dimension are covered by BS EN 771-5.
Who is BS 5642-1 - Precast concrete, cast stone, clayware, slate, and natural stone window sills specifications for?
BS 5642-1 on window sills of precast concrete, cast stone, clayware, slate and natural stone is useful for:
- Manufacturers of windows 
- Construction industries
- Manufacturers of sills and copings materials
- Civil engineers 
- Architects and interior designers 
- Builders
- Building contractors
Why should you use BS 5642-1 - Precast concrete, cast stone, clayware, slate, and natural stone window sills specifications?
BS 5642-1 defines the dimensions, performance characteristics, construction details, and specifications of window sills for use with windows that conform with the standard. The sulfuric acid immersion test for slate and the wetting and drying test for slate are both covered by BS 5642-1, which also allows you to check the specimens using a two-diameter lens.
Overall, you can apply BS 5642-1 while assembling windows to improve their quality and longevity.
What’s changed since the last update?
BS 5642-1:1978+A1:2014 supersedes BS 5642-1:1978, which is withdrawn
The principal changes in BS 5642-1:1978+A1:2014 are:
- The references have been updated, many of which have been replaced by BS ENs
- The text has been amended to be consistent with the updated references
- Text superseded by the updated references has been deleted
