The second way is to install 1×4 purlins over the shingles. You can install that new corrugated metal sheets over your old shingles, provided that your local roofing codes allow it.

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This is what it looks like when you install a steel shingle roof system over an existing asphalt shingle roof.

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How to install corrugated metal roofing over shingles. Installing metal roofing panels over shingles. It’s not a good idea to try and install shingles over metal roof panels. Attach your metal sheets to the framing.

You can install a metal roof over a single layer of shingles, but not over two or more layers. Repeat for the following rows to the other end of the roof. Venting—the eaves to vent the roof, holes are cut in the old roof above the soffit, which pulls air through the soffit vents underneath.

Continue setting panels to the roof ridge, cutting the last panel with the circular saw if necessary. It’s possible for an experienced installer to retrofit flashing and install a typical skylight on. There are a number of considerations when installing metal panels over an existing asphalt shingle roof.

One after the other, starting with one side and from the top, install the sheets and attack the screws two feet away from each other. Depending on your needs and preferences, you can install the roof with or without insulation, but in many cases, rolled insulation designed for a metal roof is a good idea. Make sure that there aren’t already two layers of shingles in place before the installation of a metal shingles roof.

Because metal roofs are so light yet so strong, metal roofing panels can typically be easily installed over your existing asphalt roof shingles without the. Follow the roof panel manufacturer’s guidelines for. Secure the sheets into place with screws.

A third roof is not allowed, so there must only be one shingle roof in place. Besides, metal roofing materials weigh much less than the shingles, making it easier for you to install then. Make sure that each sheet overlaps the first one.

While it’s perfectly fine to install corrugated metal roofing over asphalt shingles, it wouldn’t be a good idea to install shingles over corrugated metal. Corrugated metal panels are relatively lightweight and can be purchased to fit almost any situation. Once the first sheet is in place, you need to install the remainder of the lowest row of corrugated metal roofing.

Make sure that the sheets cover the whole roof area. This meant the patio cover could start at the edge of the house’s roof at a height of eight feet and slope down to seven feet, leaving a clearance of more than six and a half feet between the lowest part of the frame's headers and the ground at. Also, be sure that a breathable synthetic underlayment such as gaf deck armor is used in between the old asphalt and metal.

Cut panels to size as needed using a circular saw with a compatible blade. First, the building codes allow metal over shingles if there is only one layer of asphalt shingles. The first is to apply an approved underlayment over the old shingles.

Fasten the panels with metal roofing screws according to manufacturer instructions. Align the first metal roofing panel so that it overlaps the edging by 1/2 to 3/4 of an inch and is square to the roof line. Be sure the larger edge is laid so that the small edge of the next panel will overlap it.

Start at one eave and work your way up, overlapping the panels as you go. A metal roof can easily be installed directly over open rafters. If you want to install a.

Apply caulk or roofing sealant seam tape at each junction to properly seal the roof. Lay the next panel toward the roof ridge, overlapping the first panel 2 to 4 inches (unless otherwise noted per panel requirements), and fasten according to panel installation instructions. This is the fastest way to install but it doesn’t provide the flattest surface for metal roofing installation.

Skylights for corrugated metal roofs are different from those for shingle or tile roofs.

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