Timber Roof Purlin Span Tables

Span tables allow users to choose an appropriate size and stress grade to achieve spanning needs.

Timber roof purlin span tables.

For pitched roofs flat roofs and ceiling joists. For simple construction such as domestic construction this can be determined from span table supplements in as1684 2 and as1684 3. Building control guidance note purlin and rafter. If you have any questions about how to use.

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. Roofs and not for traditional purlin and rafter roof construction. All the figures are based on roofing tiles or slates laid on. The following tables give details of the allowable spans and spacing for some of the more common timber sizes used in traditional roofing construction.

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. The following tables give details of the allowable spans and spacing for some of the more common timber sizes used in traditional roofing construction. Surveyors span tables for designing roof rafters. It is a horizontal bar that used to support building at the roof structurally.

Other more complex load condition spans can be determined with our free hyne timber design 7 5 software. 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. Alternatively you can use the lumberworx design tool. Purlin is a well known material in the field of architecture structural building or structural engineering.

This free tool gives construction industry professionals the ability to design wall floor and roof members using the lumberworx product range. All the figures are based on roofing tiles or slates laid on timber laths over sarking felt.