Roof Timber Sizes And Spans South Africa

10m construction timber must be graded for strength and stiffness.

Roof timber sizes and spans south africa.

In the drawings specifications for rafters state that if the poles are 100 mm to 125 mm in diameter then the truss clear spans may not be greater than 4 m. Protection from the elements. Howe type truss maximum span between supporting walls. Shingle roofs typically have a life span of 15 30 years while membrane roofs usually last 5 15 years.

3m 3 6m 4 2m 4 8m 5 4m 6m and 6 6m laminated beams availble on order 76mm x 228mm or made to order. Although ceramic tile roofs are expensive they can have a life span of over 100 years. Glass wool thermal insulation. It is often compared to slope but is not exactly the same.

Please be aware many internet designs and pictures have specifications for timber sizes. Maximum clear span of flat roof joists in metres for sc3 timber spacing between joists size of roof joist 400mm 450mm 600mm 47 x 97 1 84 1 81 1 74 47 x 120 2 43 2 39 2 27 47 x 145 3 08 3 02 2 87 47 x 170 3 75 3 67 3 42 47 x 195 4 41 4 31 3 92 47 x 220 5 04 4 85 4 41 75 x 170 4 50 4 38 3 99. 50mm x 1 200mm x 10m featu. 1 300th of span roof rafters for sabs s5 graded pine floor joists for sabs s5 graded pine commercial applications spacing safe span table for south african pine based on sans 1008 2007 edition 4 spacing 1 5 kn m2 0 125 kn m2 1 5 kn 1 300th of span.

Be of the howe type with the number of bays bolts at connections timber sizes and sabs grades roof pitches as specified by sans 10400 see also nhbrc manuals 2 2 and 3 4 5. Roof pitch is the measurement of a roof s vertical rise divided by its horizontal run. All our timber rafters are available in the following lengths. If the poles are 125 mm to 150 mm in diameter then the spans may be more than 4 m but not greater than 6 m.