Nhbc Roof Truss Bracing

Diagonal bracing to double hipped roof plasterboard fire resisting ceiling in contact with single leaf masonry use of nail guns for fixing trussed rafter bracing.

Nhbc roof truss bracing.

7 2 9 bracing for trussed rafter roofs. Details of mono pitch lean to roofs and roof intersections i e. 7 2 11 support for equipment. Details of bracing requirements.

The layout of trusses and associated items. All bracing should be twice nailed with 3 35mm 10 gauge x 65mm long galvanized round wire nails to every trussed rafter it crosses and to the wallplate. To accommodate hatch openings or chimneys spacing may be increased to a maximum of twice the nominal spacing. 7 2 15 ventilation vapour control and insulation.

7 2 9 bracing for trussed rafter roofs trussed rafters shall be suitably braced to support applied loads and self weight without undue movement. Chapter 7 2 2003 amendments to the standards 2003 source. Flat coastal fringes fens airfields and moorland. Nhbc standards chapter 7 1 flat roofs and balconies.

7 2 14 underlay and sarking. Bracing requirements for trussed rafter roofs. The minimum bracing requirements are shown in appendix 7 2 c. Nhbc standards 2020.

Appendix 7 2 g strutting for attic trusses and cut roofs that have a floor. Additional bracing may be needed in exposed areas. Hips and valleys details of girder trusses multiple trusses and diminishing trusses including how they are to be fixed together and supported on truss shoes layboards or similar. Balcony drainage timber balconies and terraces revised october 2018 nhbc standards chapter 7 2 pitched roofs.

Alternatively 100mm x 25mm timber members fixed over four trusses and nailed in accordance with clause 7 2 9 can be used where the position of the strap does not coincide with a longitudinal binder. Trussed rafter roofs should be braced in accordance with table 1 in appendix 7 2 c unless the roof is designed and braced in accordance with bs 5268 3 or pd 6693 2 when published. Fixing to longitudinal bracing members using eight 25mm x 4mm steel screws evenly distributed along the length of the strap figure 2. Vertical and suitably located where necessary temporary bracing should be used to maintain spacing and to keep trusses vertical evenly spaced at maximum 600mm centres.

The roof should be braced using at least 100mm x 25mm timber. All timber bracing to trussed rafters should be at least 100mm x 25mm in section and twice nailed to each trussed rafter and to the wallplate. Appendix 7 2 e tank support details. 7 2 08 bracing of mono pitch roof trusses 7 2 09 pitched roofs bedding verge undercloaks 7 2 10 attic trusses bracing 7 2 11 pitched roofs to garages holding down straps 7 2 12 roofng underlay at eaves level 7 2 13 ventilation of small roofs.

7 2 10 strutting for attic trusses and cut roofs that form a floor. Where the maximum 600mm spacing cannot be achieved e g.