Roof Framing Details Purlin

Purlin plates in wooden construction.

Roof framing details purlin.

Post frame estimating roof types 8 post frame building details 9 post frameflashings trim 10 13 post frame trim details. Roof sag bar system. The new section range offers complete compatibility between zed and cee sections sizes. Purlins rails eaves beams 03 about steadmans nbs plus is a library of technical product information.

The strip of iron attached to the purlin. The longitudinal horizontal beam that is sitting on a post or the principal rafter of a truss and used to support common rafters. By supporting the rafters they allow longer spans than the rafters alone. Purlin plates are beams which support the mid span of rafters and are supported by posts.

Purlin plates under purlin principal purlins and common purlins. The roof framing is the structure that supports your roof. In lightweight timber roof construction under purlins were used to support rafters over longer spans than the rafters alone could span. 13 30 box gable 13 endlap rain carrying table 14 eaves 15 16 ridges 16 18 gables 18 19 flying gable 20 endwall 21 sidewall valley 22 gambrel transition 23 outside corner 24.

There are three types of purlins in wood construction. 1 introduction this detailing and installation guide is complementary to the stramit purlins girts bridging product technical manual incorporating design capacity tables. A purlin plate in wood construction is also called an arcade plate in european english under purlin and principal purlin. The guide contains details on all stramit purlins girts bridging and relevant accessories.

During the roof installation or re roofing process after the roof sheets are prepared it is time to support their framework by installing purlins. Timber vs metal frames. Timber is by far the most common material for house framing in australia. The structure of purlin helps to shift some of the loads that put on the metal sheeting to the main building construction by ensuring that the whole things stay in their place and adding structural integrity.

For example an 8 x 4 under purlin would support the center of a row of 6 x 2 rafters that in turn would support 3 x 2 roof purlins to which the roof cladding was fixed.