Span Tables Roof Purlin Spacing Australia

Safe roof purlins spans.

Span tables roof purlin spacing australia.

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. Australian standards such as as1170 series loading codes as4600 cold formed steel structures and as3623 domestic metal framing. If you want to know how to support roof purlins they are usually supported by 2 4 or 2 6 struts or posts. For 2x6s purlins the posts are spaced in 6 feet distance.

Flat roof span tables allow for a maximum roof pitch of 5º. They have been generated using the latest version of the purlin and girt software developed by the centre for advanced structural engineering at the university of sydney and cover the full range of stratco z and c sections from 75mm through to 400mm depth. Roof load width rlw and floor load width flw can be determined from as1684 or from the images below. Purlins near roof edges or changes of roof slope are subject to higher wind forces than interior purlins.

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. Use recommended minimum roof pitches as specified by roof sheet supplier. The tables include a comprehensive range of span configurations. All spans to have 1 row of bridging.

Required size for a given span. 29 norfolk close tuncurry nsw 2428 phone. The safe spans below are suitable for sheds and class 1 structures with the following assumptions. If the space between posts is greater than 8 feet then brace is needed to avoid buckling.

Sizes stramit top hat th64 series th96 series stramit battens 3 97mm approx 36mm 64mm 22mm stramit top hat th64075 th64100 th64120 stramit cyclonic roof batten stramit roof batten stramit ceiling. For 2x4s purlins the posts are spaced in 4 feet distance. From span table c the maximum allowable single span is 2160mm. Spacing should be interpreted as the centre to centre distance between adjacent parallel members.

Max roof span allowed 12m. Cleated or bracketed fixing only no flange bolting. 02 6554 6422 email. 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.

Reading off the empty under table with h 5m hc 2 5m span table c will be used to determine the spans. Cpe 0 9 and cpi 0 2. 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.