Span Tables Roof Purlin Spacing Australia

Where purlin spans are unequal between supports each purlin should have 6 25 of each adjacent span added not 6 25 of that purlin s span.

Span tables roof purlin spacing australia.

Use recommended minimum roof pitches as specified by roof sheet supplier. All spans to have 1 row of bridging. 1 refer to general notes for information that is relevant for all span tables. Design specification data section z or c thickness mm yield stress mpa mass kg m 75 95 0 95 550 1 26 75 12 1 2 500 1 59 75 15 1 5 450 1 97 100 10 1 0 550 1 77 100 12 1 2 500 2 10 100 15 1 5 450 2 61.

Safe roof purlins spans. Reading off the empty under table with h 5m hc 2 5m span table c will be used to determine the spans. 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. 3 where rafters are equal to or exceed four times their breath blocking should be used to reduce distortion.

High pressure zones kl 1 5 and 2 0 included. Purlin is a well known material in the field of architecture structural building or structural engineering. 02 6554 6422 email. 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.

Spantec has prepared these tables for use by people skilled in the design and specification of the. Pergola rafter spans for 600 mm and 900 mm spacing. 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. The safe spans below are suitable for sheds and class 1 structures with the following assumptions.

Wind classification n1 n2. Purlins near roof edges or changes of roof slope are subject to higher wind forces than interior purlins. Table assumes a maximum flooring mass of 40kg m2. Max roof span allowed 12m.

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. Cleated or bracketed fixing only no flange bolting. It is a horizontal bar that used to support building at the roof structurally. Joists crippled over supports shall be considered as single span joists.

2 for design parameters refer to figure 7 26. Spacing should be interpreted as the centre to centre distance between adjacent parallel members. Roof load width rlw and floor load width flw can be determined from as1684 or from the images below. Cpe 0 9 and cpi 0 2.

Required size for a given span. From span table c the maximum allowable single span is 2160mm.