How To Install Metal Roofing Over Purlins

Installing wood stripping under a tin roof.

How to install metal roofing over purlins.

The purpose of the purlins is to provide a solid foundation for the metal roofing panels and trim to be screwed to. 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. Add the metal panels. If you are placing metal panels over an existing roof you still use purlins.

Lay the starter row of metal shingles at the drip edge and affix to the roof with metal roofing nails. I was planning to install directly over 2x4 purlins which are mostly already installed. How to install metal roof purlins step 1. This is by far the most common way to install a metal roof.

The topic we want to discuss today is the purlin installation. Run a tape measure from end to end along the rafters of the roof to determine how many purlins will be needed. The edging or eave flashing consists of metal strips that are used to cover the perimeter of the roof. Use your 1 1 4.

Snap a chalk line horizontally across the roof two feet down from the top. This shop will be insulated but mostly unheated except when i m working in there say 10 hours a week. 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. Always begin working at the point with the longest peak to eave distance.

Most metal shingles will be attached to the roof using metal shingle. Set the second. As long as the plywood under the shingle roof is in good condition this way can provide many benefits. Lay the first purlin at the ridge of.

The purlins support the panels. 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 roofing is manufactured in panels that. Tin roofing also known as metal roofing is considered more durable than composition or wood shingles.

I am installing ribbed metal panels over a singlt slope roof on a new workshop. Work up from the initial row starting at the lower corner in a diagonal pattern staggering the shingles to prevent gaps.