Installing Metal Roof With Purlins

Add the metal panels.

Installing metal roof with purlins.

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. 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. This is by far the most common way to install a metal roof. As long as the plywood under the shingle roof is in good condition this way can provide many benefits.

You also need to add. The purpose of the purlins is to provide a solid foundation for the metal roofing panels and trim to be screwed to. During the roof installation or re roofing process after the roof sheets are prepared it is time to support their framework by installing purlins. Installation of pole barn purlins.

Most metal shingles will be attached to the roof using metal shingle. Do all roofing projects require purlins. Purlins are dimensional lumber that are fastened to the top chord of trusses connecting them together for bracing purposes. Always begin working at the point with the longest peak to eave distance.

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. Snap a chalk line horizontally across the roof two feet down from the top. Take care the first piece is aligned precisely perpendicular square to the edge. Spacing is typically 24 on center in low snow loads and is reduced based upon truss span and snow load.

Lay the starter row of metal shingles at the drip edge and affix to the roof with metal roofing nails. 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. The purlin are ultimately used to fasten the roof steel providing a diaphragm effect along with the siding when properly engineered and installed. Lay the first purlin at the ridge of.

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. How to install metal roof purlins step 1.