How To Support Roof Purlins

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.

With rafters it runs in perpendicular from the walls to the ridge while with purlins it runs to the ridge in parallel. 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. Snap a chalk line horizontally across the roof two feet down from the top. Lay the first purlin at the ridge.

Run a tape measure from end to end along the rafters of the roof to determine how many purlins will be needed for installation. Placing the roof along the perimeter of your roof is. In architecture or structural engineering or building a purlin or purline is a horizontal structural member in a roof. Double them up in valleys.

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. Purlins can be fixed to rafters and all joins and laps should be supported by a rafter. The c purlins are not welded or screwed to the support girder just bolted through to the 16ga plate. The support system for the roof is comprised of ridgepole and rafters or purlins.

Obviously the spacing of the trusses is the span of the purlin. Have them installed by following the edges or sides of your roof. They are lapped 48 over the supports. How to install metal roof purlins.

Purlins consist of angles channels or i sections. Here are several useful tips for purlin installations. Using a combination of rafters and purlins is common. The roof purlins are 9 deep 16 ga.

Due to the angle that created in the valley it is necessary to double the purlins. The plate is sandwiched between the c purlins and is attached to the top flange of the support girder. Between the lapped c purlins is a 16ga. These are members spanning on the roof frames to support the roof coverings.

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.