Also see:
Part 8.0
7.2.18 Roof coverings
Roof coverings shall be of a suitable quality and durability to protect the building from weather.
When covering a pitched roof:
- coverings should be in accordance with the design and established building practices
- recovered materials may be used where prior approval by NHBC has been granted (independent certification of suitability may be required).
Table 19: Standards relevant to roof coverings
Material | Standard | Code of Practice | Other guidance |
---|---|---|---|
Clay tiles and fittings | BS EN 1304 | ||
Concrete tiles and fittings | BS EN 490 and BS EN 491 | ||
Dry fixed systems | BS 8612 | ||
Natural slates | BS EN 12326 | ||
Fibre cement slates and fittings | BS EN 492 | ||
Fully supported lead sheet roofing | BS 6915 | Technical requirement R3 | |
Rolled lead sheet for building purposes | BS EN 12588 | ||
Zinc and zinc alloys | BS EN 988 | CP 143-5 | Technical requirement R3 |
Copper | BS EN 1172 | CP 143-12 | Technical requirement R3 |
Stainless steel | BS EN 508-3 | Technical requirement R3 | |
Aluminium | BS EN 508-2 | CP 143-15 | Technical requirement R3 |
Roof windows | BS EN 14351-1 | Technical requirement R3 | |
Natural stone slates | Established practices | ||
Thatch | Standards set by the Thatching Advisory Services or other appropriate authority, in accordance with Technical Requirement R3 | ||
Shingles should be of western red cedar | Grade 1 to the Canadian Standards Association | ||
Proprietary roof coverings and products ie, Flashings, soakers, GRP and composite products (dormers, chimneys, copings, cappings, bay window canopies, etc) | Proprietary products should hold a satisfactory assessment by an appropriate independent technical approval’s authority acceptable to NHBC. |
Natural slates used for roofing should meet the requirements of Table 20.
Table 20: Acceptable characteristics for natural slates
Characteristics | Grade to BS EN 12326:2014 (1) |
---|---|
Water absorption less than 0.6% | W1 |
Thermal cycle | T1 |
Carbonate content less than 20% | S1 |
Notes
1. A copy of the slate manufacturers Accompanying Commercial Document (ACD), in accordance with BS EN 12326:2014, should be provided to NHBC when requested.
Last updated: 2nd January 2024