Installing metal roofing over existing roofing material can usually be successfully. Harrison mccampbell, aia, roofing and waterproofing specialist, replies:

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Step By Step Guide How To Install Metal Roofing Over Shingles

The installation of metal roofing is often easier and faster than other roof types, and because of its simple design and generally large size, can actually be installed directly on top of existing roofing materials like asphalt shingles and foam roofing.

How to install metal roofing over shingles video. Leave the old valley flashing in place, and install new over it. Anatomy of a steel roof. The use of roof hugger systems allows you add blanket, rigid and/or reflective insulation between the existing and new roofs.

The national average cost to install a metal shingles roof on house can range between $8.50 and $14.50 per square foot. Installing metal roofing over shingles can help solve these issues. To vent the roof, holes are cut in the old roof above the soffit, which pulls air through the soffit vents underneath.

In fact, asphalt roofing shingles make up over 3% of all municipal solid waste, or 6.8 million tons annually. There are a number of considerations when installing metal panels over an existing asphalt shingle roof. To do this, courses of shingles are removed, then the final sections of metal roofing are set in place before the flashing is installed.

I think that putting a metal roof over shingles is unwise for at least three reasons: Because asphalt shingles are routinely exposed 5 in., rip down the first strip (the starter course) so that it is 5 in. The second way is to install 1×4 purlins over the shingles.

The last step is reinstalling shingles across the transition. With the existing roof left in place. This is the fastest way to install but it doesn’t provide the flattest surface for metal roofing installation.

Besides the necessary roofing skills, you will need to learn tips specific to shingles installation. There could be some rotted decking and/or rafters below that may not be visible unless you tear off the old asphalt shingles. By using roof huggers, the existing roof can be left in place.

Choose a shingle style with the same dimensions as those on your. Installing metal roofing panels over shingles. Be sure the larger edge is laid so that the small edge of the next panel will overlap it.

Follow the roof panel manufacturer’s guidelines for. A third roof is not allowed, so there must only be one shingle roof in place. This provides a safer environment for both workers inside the building and the roofers as they install the new roof.

Installing shingles over metal roofing is not a thing that you should even try to do. First, the building codes allow metal over shingles if there is only one layer of asphalt shingles. Although many metal roof systems can be applied over an existing roof, layovers are more commonly done with asphalt shingles.

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. The first is to apply an approved underlayment over the old shingles. By laying metal roofing over the shingles of an existing roof you are protecting it from the weather and also from the effects of time.

If you wish to install metal roofing over shingles, it’s recommended to do it one of two ways. This is what it looks like when you install a steel shingle roof system over an existing asphalt shingle roof.

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