How To Support Roof Purlins

Have them installed by following the edges or sides of your roof.

How to support roof purlins.

The use of purlins as opposed to closely spaced rafters is common in pre engineered metal building systems and both the ancient post and beam and newer pole building timber frame construction methodologies. These are members spanning on the roof frames to support the roof coverings. Obviously the spacing of the trusses is the span of the purlin. In architecture or structural engineering or building a purlin or purline is a horizontal structural member in a roof.

Here are several useful tips for purlin installations. When angles and channels are used the connections of the purlin to the rafters are made by using cleat angles. Purlins consist of angles channels or i sections. Lay the first purlin at the ridge.

Double them up in valleys. How to install metal roof purlins. Purlins can be fixed to rafters and all joins and laps should be supported by a rafter. The roof purlins are 9 deep 16 ga.

They are lapped 48 over the supports. How to support roof purlins. Placing the roof along the perimeter of your roof is. The plate is sandwiched between the c purlins and is attached to the top flange of the support girder.

Due to the angle that created in the valley it is necessary to double the purlins. The support system for the roof is comprised of ridgepole and rafters or purlins. 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. Using a combination of rafters and purlins is common.

Snap a chalk line horizontally across the roof two feet down from the top. With rafters it runs in perpendicular from the walls to the ridge while with purlins it runs to the ridge in parallel. The c purlins are not welded or screwed to the support girder just bolted through to the 16ga plate. An insurance carrier has questioned the lack of roll clips at the roof purlins.

Purlins need to follow the sides edges of the roof it is important to note that in addition to the proper spacing and doubling of purlins the valleys it is essential to include purlins along the entire perimeter of the roof.