Timber Roof Purlin Sizes

Now if you are strapping the rafters 1x4 pt is usually used set at 2 intervals or closer and you double the first one at the edge of the metal.

Timber roof purlin sizes.

Vc row vc column vc column text timber purlins supplier we have a large range of tanalised purlins in stock for timber contruction of farm and agricultural. Maximum clear span of rafters in metres for roof pitches of between 15 and 45 degrees. All about purlin span for metal roof. They both can be combined well to make sure that the space below the roof.

All the figures are based on roofing tiles or slates laid on. 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. Purlins near roof edges or changes of roof slope are subject to higher wind forces than interior purlins. Purlins are spaced based on designs or type of roofing sheets.

You don t have a nailing surface on the end of a 1x4. But for our calculations we are using 900mm. Roof pitch between 15 and 22 5 degrees with rafter spacing strength. 2 by 4 i e 50mm by 100mm.

This is the distance between rafter centres. 2 by 2 i e 50mm by 50mm. Wood timber are sawn into various sizes amongst are. Surveyors span tables for designing roof rafters.

Building control guidance note purlin. Purlin and rafter roofs timber sizes and construction details author. Roof pitch between 15 and 22 5 degrees with rafter spacing strength class c16. Roof pitch between 15 and 22 5 degrees with rafter spacing.

The following tables give details of the allowable spans and spacing for some of the more common timber sizes used in traditional roofing construction. Usually 400 450 or 600mm but any value can be used up to 610mm max. J l neal subject. 2 by 3 i e 50mm by 75mm.

Purlins are the wood of 2 by 2 or 50mm by 50mm we nail the roofing sheets on. It is suitable to use for roof sheeting from fiber cement.