Attic Truss Purlins

Usually builders want to drive a 60d nail through purlins into truss tops however this connection doesn t calculate out as being able to keep purlins from ripping off the building during severe weather.

Attic truss purlins. Purlins are beams of light sections spanning between trusses carrying dead load of roof live load and wind load. Roof purlin are members used to directly support roof sheeting materials and could be made of timber or steel. Stock sizes include gables from 20 to 40 wide and lean to styles in 12 and 20 wide. Purlins support the loads from the roof deck or sheathing and are supported by the principal rafters and or the building walls steel beams etc.

From this shot it appears that there are three purlins on either side of the roof. 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. Compare click to add item 24 spreadweb residential roof truss 5 12 pitch 87 to the compare list. The purlin are ultimately used to fasten the roof steel providing a diaphragm effect along with the siding when properly engineered and installed.

In architecture or structural engineering or building a purlin or purline is a horizontal structural member in a roof. The sheathing boards are sometimes called the roof deck and are painted white. Pre welded purlin cups predrilled bolt holes and included mounting hardware for fast easy installation. Add to list click to add item 24 spreadweb residential roof truss 5 12 pitch 87 to your list.

Purlins are dimensional lumber that are fastened to the top chord of trusses connecting them together for bracing purposes. There are many types of roof trusses as wall as many types of roofs more types than there are parts. The purlins are the large beams perpendicular to the rafters. Purlins transmit these loads to the trusses.

Click to add item 24 spreadweb residential roof truss 5 12 pitch 87 to the compare list. Most builders are not willing to spend time to install an engineered steel tie down for purlins in this scenario. We provide angle iron steel trusses in gable lean to and header styles. This article and series of illustrated diagrams shows you all the parts of a basic roof truss king truss and queen truss.

To strengthen the roof system truss clustering cross bracing and wind bracing is recommended at both end of the buildings and every 20 for longer span buildings.