Installing Metal Roof With Purlins

As long as the plywood under the shingle roof is in good condition this way can provide many benefits.

Installing metal roof with purlins.

Purlins are dimensional lumber that are fastened to the top chord of trusses connecting them together for bracing purposes. Run a tape measure from end to end along the rafters of the roof to determine how many purlins will be needed. Snap a chalk line horizontally across the roof two feet down from the top. 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.

Do all roofing projects require purlins. The purlin are ultimately used to fasten the roof steel providing a diaphragm effect along with the siding when properly engineered and installed. The purpose of the purlins is to provide a solid foundation for the metal roofing panels and trim to be screwed to. Lay the starter row of metal shingles at the drip edge and affix to the roof with metal roofing nails.

Lay the first purlin at the ridge of. Always begin working at the point with the longest peak to eave distance. Add the metal panels. This is by far the most common way to install a metal roof.

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. How to install metal roof purlins step 1. You also need to add.

Take care the first piece is aligned precisely perpendicular square to the edge. During the roof installation or re roofing process after the roof sheets are prepared it is time to support their framework by installing 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. 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.

Installation of pole barn purlins. 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.