Roof Truss Rafter And Purlin

This is an example of a double roof with principal rafters and common rafters.

Roof truss rafter and purlin.

Trusses usually occur at regular intervals linked by longitudinal timbers such as purlins. Parts of a traditional queen post roof truss. Rafter boards are fastened to the ridge board at the peak and the top plate where they join the wall. A common arrangement is a rafter and purlin system which combines purlins and rafters.

Note that these are normally only required to trussed rafter roofs and not for traditional purlin and rafter roof construction. You have to take the width of your roofing panel into the considerations. Click to add item 26 spreadweb residential roof truss 5 12 pitch 87 to the compare list. The boards creating the slope of the roof are wider than lumber used to build trusses 2x8s 2x10s and 2x12s are most common in rafters vs.

This is the right way to fix truss clips connecting the rafter and wall plate. Roof purlin are members used to directly support roof sheeting materials and could be made of timber or steel. From this shot it appears that there are three purlins on either side of the roof. Purlin plates under purlin principal purlins and common purlins.

Determining rafter s spacing is as important as setting the metal roof purlins spacing. Add to list click to add item 26 spreadweb residential roof truss 5 12 pitch 87 to your list. In finished space insulation is placed between the rafter boards and drywall or other material is fastened to the face. The most common measurement used for rafter spacing is either 16 or 24 inches.

A timber roof truss is a structural framework of timbers designed to bridge the space above a room and to provide support for a roof. There are three types of purlins in wood construction. In timber construction purlins are nailed to the rafter or supporting trusses while in steel roof construction they are welded or bolted to the rafters or trusses by the means of cleats. The roof support system is a ridgepole and either rafters which run perpendicular from the top of the walls to the ridge or purlins which run parallel to the ridge.

The longitudinal horizontal beam that is sitting on a post or the principal rafter of a truss and used to support common rafters. The sheathing boards are sometimes called the roof deck and are painted white.