How To Install Metal Roofing Over Purlins

If you are placing metal panels over an existing roof you still use purlins.

How to install metal roofing over purlins.

Run a tape measure from end to end along the rafters of the roof to determine how many purlins will be needed. This method is used for trusses designed to be closer together from 2 on center up to a maximum of 5 on center. Tin roofing also known as metal roofing is considered more durable than composition or wood shingles. The roofing is manufactured in panels that.

The edging or eave flashing consists of metal strips that are used to cover the perimeter of the roof. Add the metal panels. 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. Use your 1 1 4.

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. Lay the first purlin at the ridge of. 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. Always begin working at the point with the longest peak to eave distance. I am installing ribbed metal panels over a singlt slope roof on a new workshop. The purlins support the panels.

Installing wood stripping under a tin roof. 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. The purpose of the purlins is to provide a solid foundation for the metal roofing panels and trim to be screwed to.

I was planning to install directly over 2x4 purlins which are mostly already installed. Lay the starter row of metal shingles at the drip edge and affix to the roof with metal roofing nails. Snap a chalk line horizontally across the roof two feet down from the top. The topic we want to discuss today is the purlin installation.

Take your first sheet of. This shop will be insulated but mostly unheated except when i m working in there say 10 hours a week.