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.
How to support roof purlins.
Snap a chalk line horizontally across the roof two feet down from the top.
Lay the first purlin at the ridge.
Purlins can be fixed to rafters and all joins and laps should be supported by a rafter.
Here are several useful tips for purlin installations.
Placing the roof along the perimeter of your roof is.
Have them installed by following the edges or sides of your roof.
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.
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.
Due to the angle that created in the valley it is necessary to double the purlins.
Run a tape measure from end to end along the rafters of the roof to determine how many purlins will be needed for installation.
How to install metal roof purlins.
With rafters it runs in perpendicular from the walls to the ridge while with purlins it runs to the ridge in parallel.
The support system for the roof is comprised of ridgepole and rafters or purlins.