Timber Roof Purlin Span Tables

For simple construction such as domestic construction this can be determined from span table supplements in as1684 2 and as1684 3.

Timber roof purlin span tables.

Roofs and not for traditional purlin and rafter roof construction. Span tables allow users to choose an appropriate size and stress grade to achieve spanning needs. Building control guidance note purlin and rafter. Surveyors span tables for designing roof rafters.

All the figures are based on roofing tiles or slates laid on timber laths over sarking felt. It is a horizontal bar that used to support building at the roof structurally. Span tables lumberworx has created the span tables below to assist in the specification of the lumberworx members. Alternatively you can use the lumberworx design tool.

If you have any questions about how to use. Other more complex load condition spans can be determined with our free hyne timber design 7 5 software. There is an available purlin for every type of roofing material including purlin span for metal roof which is the most common material type to use this item. Pitched roof timber sizes.

The following tables give details of the allowable spans and spacing for some of the more common timber sizes used in traditional roofing construction. The following tables give details of the allowable spans and spacing for some of the more common timber sizes used in traditional roofing construction. For pitched roofs flat roofs and ceiling joists. Surveyors and structural engineers utilise data from tables below to help calculate the correct size strength and centres of roof timbers for the required spans and loadings.

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. All the figures are based on roofing tiles or slates laid on.