Span Tables Roof Purlin Spacing Australia

All spans to have 1 row of bridging.

Span tables roof purlin spacing australia.

For 2x6s purlins the posts are spaced in 6 feet distance. 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. 29 norfolk close tuncurry nsw 2428 phone. 02 6554 6422 email.

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. Use recommended minimum roof pitches as specified by roof sheet supplier. Spacing should be interpreted as the centre to centre distance between adjacent parallel members. Required size for a given span.

Purlins near roof edges or changes of roof slope are subject to higher wind forces than interior purlins. If you want to know how to support roof purlins they are usually supported by 2 4 or 2 6 struts or posts. Joists crippled over supports shall be considered as single span joists. Reading off the empty under table with h 5m hc 2 5m span table c will be used to determine the spans.

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. The safe spans below are suitable for sheds and class 1 structures with the following assumptions. Spantec has prepared these tables for use by people skilled in the design and specification of the. Cleated or bracketed fixing only no flange bolting.

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. From span table c the maximum allowable single span is 2160mm. Safe roof purlins spans. 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.

High pressure zones kl 1 5 and 2 0 included. Max roof span allowed 12m. Roof load width rlw and floor load width flw can be determined from as1684 or from the images below. For 2x4s purlins the posts are spaced in 4 feet distance.

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. Cpe 0 9 and cpi 0 2. Flat roof span tables allow for a maximum roof pitch of 5º. If the space between posts is greater than 8 feet then brace is needed to avoid buckling.