How To Install Metal Roofing Over Purlins

This method is used for trusses designed to be closer together from 2 on center up to a maximum of 5 on center.

How to install metal roofing over purlins. Set the second. This shop will be insulated but mostly unheated except when i m working in there say 10 hours a week. 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. Use your 1 1 4.

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. How to install metal roof purlins step 1. Run a tape measure from end to end along the rafters of the roof to determine how many purlins will be needed.

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. The purlins support the panels. This is by far the most common way to install a metal roof. If you are placing metal panels over an existing roof you still use purlins.

Always begin working at the point with the longest peak to eave distance. 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. Lay the starter row of metal shingles at the drip edge and affix to the roof with metal roofing nails. Tin roofing also known as metal roofing is considered more durable than composition or wood shingles.

Most metal shingles will be attached to the roof using metal shingle. 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. The roofing is manufactured in panels that.

I was planning to install directly over 2x4 purlins which are mostly already installed. Lay the first purlin at the ridge of. Add the metal panels. The purpose of the purlins is to provide a solid foundation for the metal roofing panels and trim to be screwed to.

Snap a chalk line horizontally across the roof two feet down from the top. 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.