Bracing Old Roof

Applicable to all trussed rafter roofs unless rigid sarking such as timber boarding or plywood is used.

Bracing old roof.

Temporary bracingthis is used to restrain the trusses during erection. Wind or wall bracingthis bracing is installed in the roof in. They are designed to withstand vertical pressure but not horizontal pressure. In this video we cover how to brace a conventionally framed roof and why it is important to do so.

Using the same house as in the previous articles on subfloor bracing build 132 pages 38 41 and wall bracing build 133 pages 32 36 we use nzs 3604 2011 timber framed buildings section 10 3 to work out the roof space and roof plane bracing required. Bracing of a timber framed building is required to resist horizontal wind and earth quake loads. To support long rafters braces or other types of supports must be installed. Truss stability bracing this is permanent bracing which holds the trusses upright straight and prevents any out of plane buckling of the members.

See product data sheet no 3 for more information. Diagonal rafter bracing should be approximately 45 to the rafters on plan. Interior support or bracing. Bracing for roofs that are approximately square.

However installation of trusses longer than 60 feet requires a professionally engineered bracing system. Roof bracing performs three distinct functions. Small trusses can be installed by a crew of two to three workers. The roof is of wood covered with tar and gravel and supported by 10 steel trusses arranged in pairs each pair of trusses being braced together by lateral struts and diagonal rods in the planes of the top chords and by 5 panels of vertical transverse bracing between each pair of trusses with five lateral struts between each pair of tie beams.

You will learn some great tricks for using braces to keep. This compilation of articles from build magazine looks at the bracing requirements for. Rafter layout rafters must be laid out and cut with slope length and overhang exactly right so that they will fit when placed in the roof. The bracing demand to resist wind is expressed in bracing units bus per lineal metre and bracing units per square metre for earthquakes.

In long spans the roof would sag in the middle if it were not strengthened in some way.