How To Install Metal Roofing Over Purlins

I am installing ribbed metal panels over a singlt slope roof on a new workshop.

How to install metal roofing over purlins.

Always begin working at the point with the longest peak to eave distance. This shop will be insulated but mostly unheated except when i m working in there say 10 hours a week. Snap a chalk line horizontally across the roof two feet down from the top. 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 most common method employed is laying the purlin flat typically a 2 4 and nailing to the truss with two 20d galvanized ring shank nails. As long as the plywood under the shingle roof is in good condition this way can provide many benefits. The purlins not only give you something other than the existing roof to accept the roof panel fasteners they also create an airspace between the roof panels and the existing roof. Set the second.

The roofing is manufactured in panels that. The purlins support the panels. Run a tape measure from end to end along the rafters of the roof to determine how many purlins will be needed. How to install metal roof purlins step 1.

The purpose of the purlins is to provide a solid foundation for the metal roofing panels and trim to be screwed to. If you are placing metal panels over an existing roof you still use purlins. Installing wood stripping under a tin roof. The edging or eave flashing consists of metal strips that are used to cover the perimeter of the roof.

Add the metal panels. I was planning to install directly over 2x4 purlins which are mostly already installed. This method is used for trusses designed to be closer together from 2 on center up to a maximum of 5 on center. Work up from the initial row starting at the lower corner in a diagonal pattern staggering the shingles to prevent gaps.

Use your 1 1 4. Lay the first purlin at the ridge of. The topic we want to discuss today is the purlin installation. Most metal shingles will be attached to the roof using metal shingle.

Take your first sheet of. 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.