Building Regulations

NHBC Standards – 7 2 Pitched roofs

Chapter 7.2 This Chapter gives guidance on meeting the Technical Requirements and recommendations for pitched roofs, including trussed rafter and traditional cut roofs, vertical tiling, weatherproofing and insulation.

NHBC Standards do not cover aspects of health and safety relating to building operations and to the handling and use of certain building materials. Such matters are covered by statutory requirements.

This version of the Standards has been updated to include the Amendments to the Standards April 2004. The changes reflect the revised British standard BS 5534 for tiling and slating regarding the fixings to roof coverings and also batten sizes.

Builders should familiarise themselves with the new minimum fixing requirements and check with the tile manufacturer what, if any, additional fixings are necessary. Ridge tiles need to be mechanically fixed for at least 900mm from the end and either side of a party wall.  Tiling batten sizes are either 25x38mm or 25x50mm depending on the tile design – 19x38mm battens are no longer suitable (see Appendix 7.2F). (NHBC Standards Extra, Issue 29, April 2004).

Previous versions of the standards can be accessed in the Archive section (below).

Section 7.2 Contents

DESIGN

•        Design Standard

•        Statutory requirements

•        Loadbearing structure

•        Trussed rafter roofs

•        Traditional cut roofs

•        Timber treatment

•        Weathertightness

•        Insulation and control of condensation

•        Fire spread

•        Access

•        Roof drainage

•        Provision of information

MATERIALS

•        Materials standards

•        Structural timber

•        Restraint straps and holding down straps

•        Roofing materials

•        Reclaimed materials

SITEWORK

•        Sitework standards

•        Wall plates

•        Strapping

•        Trussed rafters

•        Traditional cut roofs

•        Water tank supports

•        Fascias, bargeboards and soffits

•        Roofing materials

•        Flashings and weatherings

•        Firestopping

•        Thermal insulation

•        Roof drainage

APPENDIX 7.2-A

•        Statutory references

APPENDIX 7.2-B

•        Protection from corrosion of metal components embedded in masonry

APPENDIX 7.2-C

•        Roof tile fixings

APPENDIX 7.2-D

•        Bracing requirements for trussed rafter roofs

APPENDIX 7.2-E

•        Tank support details

APPENDIX 7.2-F

•        Sizes and spacing of tile battens

APPENDIX 7.2-G

•        Strutting for attic trusses and cut roofs that have a floor

LIST OF CHAPTERS
INDEX

Archive

Chapter 7.2 (2003)

Amendments to the Standards (2003)

Source: NHBC Standards

            April 2004

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