Installing Metal Roof With Purlins

Add the metal panels.

Installing metal roof with purlins.

The purpose of the purlins is to provide a solid foundation for the metal roofing panels and trim to be screwed to. This is by far the most common way to install a metal roof. Lay the first purlin at the ridge of. Snap a chalk line horizontally across the roof two feet down from the top.

Lay the starter row of metal shingles at the drip edge and affix to the roof with metal roofing nails. 3 install 1x4 purlins down over the shingles before installing the metal roof the third way to install a metal roof over shingles is by applying 1x4 purlins over the shingle roof. Work up from the initial row starting at the lower corner in a diagonal pattern staggering the shingles to prevent gaps. As long as the plywood under the shingle roof is in good condition this way can provide many benefits.

Spacing is typically 24 on center in low snow loads and is reduced based upon truss span and snow load. Most metal shingles will be attached to the roof using metal shingle. Take your first sheet of metal and place it on the roof so that it overhangs the edge at least 3 4 in 1 9 cm. Always begin working at the point with the longest peak to eave distance.

You also need to add. Take care the first piece is aligned precisely perpendicular square to the edge. Purlins are non pressure treated 1 x 4 x 12 lumber that is installed on to the roof in a specific layout pattern and screw pattern. Do all roofing projects require purlins.

Installation of pole barn purlins. When installing a metal roof over an existing roof insulate the spaces between the wood strips with rigid insulation to prevent condensation before installing the roofing. The structure of purlin helps to shift some of the loads that put on the metal sheeting to the main building construction by ensuring that the whole things stay in their place and adding structural integrity. Run a tape measure from end to end along the rafters of the roof to determine how many purlins will be needed.

Set the second. The purlin are ultimately used to fasten the roof steel providing a diaphragm effect along with the siding when properly engineered and installed.