Roof Truss Rafter And Purlin

Add to list click to add item 26 spreadweb residential roof truss 5 12 pitch 87 to your list.

Roof truss rafter and purlin.

Note that these are normally only required to trussed rafter roofs and not for traditional purlin and rafter roof construction. Rafter boards are fastened to the ridge board at the peak and the top plate where they join the wall. There are three types of purlins in wood construction. 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.

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. In finished space insulation is placed between the rafter boards and drywall or other material is fastened to the face. Determining rafter s spacing is as important as setting the metal roof purlins spacing. 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.

Parts of a traditional queen post roof truss. The most common measurement used for rafter spacing is either 16 or 24 inches. From this shot it appears that there are three purlins on either side of the roof. The sheathing boards are sometimes called the roof deck and are painted white.

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. Roof purlin are members used to directly support roof sheeting materials and could be made of timber or steel. Posted in metal roof roof types. Purlin plates under purlin principal purlins and common purlins.

The purlins are the large beams perpendicular to the rafters. This is the right way to fix truss clips connecting the rafter and wall plate. Click to add item 26 spreadweb residential roof truss 5 12 pitch 87 to the compare list. This is an example of a double roof with principal rafters and common rafters.

You have to take the width of your roofing panel into the considerations. The longitudinal horizontal beam that is sitting on a post or the principal rafter of a truss and used to support common rafters.