Span Tables Roof Purlin Spacing Australia

All spans to have 1 row of bridging.

Span tables roof purlin spacing australia.

29 norfolk close tuncurry nsw 2428 phone. 02 6554 6422 email. Table assumes a maximum flooring mass of 40kg m2. Rafter span tables use these tables to determine lengths sizes and spacing of rafters based on a variety of factors such as species load grade spacing and pitch.

Step 4 assume the wind classification for the area is n1 and the roofing profile is stramit corrugated cladding 0 48mm bmt thickness in a single span configuration. Max roof span allowed 12m. Roof load width rlw and floor load width flw can be determined from as1684 or from the images below. Spantec has prepared these tables for use by people skilled in the design and specification of the.

If the space between posts is greater than 8 feet then brace is needed to avoid buckling. If you want to know how to support roof purlins they are usually supported by 2 4 or 2 6 struts or posts. Cpe 0 9 and cpi 0 2. As per as1684 and as4055 spanman adopts a nett pressure coefficient applied along the full length of the purlin of cpn 2 0 for non cyclonic zones n1 to n6 and cpn 2 5 for cyclonic zones c1 to c4.

Visit the roof framing page for more information on cutting roof rafters and visit the roof pitch calculator for determining rafter lengths based on rise and run. Cleated or bracketed fixing only no flange bolting. Posts these span tables are designed for a minimum post size of 50 x 50 x 2 5mm up to a maximum height of 3 0m. Spacing should be interpreted as the centre to centre distance between adjacent parallel members.

For 2x4s purlins the posts are spaced in 4 feet distance. Use recommended minimum roof pitches as specified by roof sheet supplier. Purlins near roof edges or changes of roof slope are subject to higher wind forces than interior purlins. Flat roof span tables allow for a maximum roof pitch of 5º.

Safe roof purlins spans. The safe spans below are suitable for sheds and class 1 structures with the following assumptions. For 2x6s purlins the posts are spaced in 6 feet distance. High pressure zones kl 1 5 and 2 0 included.

Required size for a given span. Joists crippled over supports shall be considered as single span joists. Rafter or uss spacing w lintel span sheet roofing tiled roofing roof load width rlw mm 1500 2100 4500 7500 1500 2100 4500 7500 maximum span of lintel mm. From span table c the maximum allowable single span is 2160mm.