Purlins Roof Support
How to support roof purlins purlins can be fixed to rafters and all joins and laps should be supported by a rafter.
Purlins roof support. Step 1 run a tape measure from end to end along the rafters of the roof to determine how many purlins will be needed for installation. With rafters it runs in perpendicular from the walls to the ridge while with purlins it runs to the ridge in parallel. Purlins are 2 by 4 feet and are installed much like metal roofing. Using a combination of rafters and purlins is common.
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. Once your purlins have been fitted and a supporting framework has been created you should look to carry out an inspection before you continue work. They are installed on top of the roof rafters with a felt underlayment or vapor barrier installed on top. Purlins are 2 by 4 feet and are installed much like metal roofing.
The support system for the roof is comprised of ridgepole and rafters or purlins. Available in red oxide or galvanized cee purlins are available cut to length. They give added support to the roof and also provide a nailing surface for the end panels and drip edge. Purlins are installed horizontally under metal roofs.