Roof Truss Rafter And Purlin

The sheathing boards are sometimes called the roof deck and are painted white.

Roof truss rafter and purlin.

There are three types of purlins in wood construction. Roof purlin are members used to directly support roof sheeting materials and could be made of timber or steel. Trusses usually occur at regular intervals linked by longitudinal timbers such as purlins. Purlin plates under purlin principal purlins and common purlins.

You have to take the width of your roofing panel into the considerations. 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. Posted in metal roof roof types. Click to add item 26 spreadweb residential roof truss 5 12 pitch 87 to the compare list.

The most common measurement used for rafter spacing is either 16 or 24 inches. Note that these are normally only required to trussed rafter roofs and not for traditional purlin and rafter roof construction. Parts of a traditional queen post roof truss. A common arrangement is a rafter and purlin system which combines purlins and rafters.

This is an example of a double roof with principal rafters and common rafters. The longitudinal horizontal beam that is sitting on a post or the principal rafter of a truss and used to support common rafters. The purlins are the large beams perpendicular to the rafters. In finished space insulation is placed between the rafter boards and drywall or other material is fastened to the face.

Rafter boards are fastened to the ridge board at the peak and the top plate where they join the wall. 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. From this shot it appears that there are three purlins on either side of the roof.

Compare click to add item 26 spreadweb residential roof truss 5 12 pitch 87 to the compare list. 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.