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.

How to install metal roofing over purlins. 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. If you are placing metal panels over an existing roof you still use purlins. As long as the plywood under the shingle roof is in good condition this way can provide many benefits. Installing wood stripping under a tin roof.

The purlins support the panels. This method is used for trusses designed to be closer together from 2 on center up to a maximum of 5 on center. Use your 1 1 4. 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.

Tin roofing also known as metal roofing is considered more durable than composition or wood shingles. Lay the starter row of metal shingles at the drip edge and affix to the roof with metal roofing nails. Take your first sheet of. I was planning to install directly over 2x4 purlins which are mostly already installed.

Snap a chalk line horizontally across the roof two feet down from the top. Add the metal panels. This is by far the most common way to install a metal roof. Work up from the initial row starting at the lower corner in a diagonal pattern staggering the shingles to prevent gaps.

The roofing is manufactured in panels that. Lay the first purlin at the ridge of. The edging or eave flashing consists of metal strips that are used to cover the perimeter of the roof. Most metal shingles will be attached to the roof using metal shingle.

The topic we want to discuss today is the purlin installation. 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. 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. 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.