However you should only install a metal roof over shingles if you have less than four layers of shingles on the roof.
Steel roof on porch over shingles.
Steel roofing can be costly but it is a lifetime investment.
Asphalt shingles are the most popular roofing material.
Galvanized steel roof panel.
7 things to know before choosing a metal roof if your current roof is the root of your headache and maybe even a long list of costly home repairs consider these metal roofing pros and cons.
Classic rib steel roof panel in charcoal.
Most metal roofs applied over a combustible material such as wood shingles have a lower class c rating for this reason.
They offer steel roofing shingles which are 100 recyclable have the highest hail and fire ratings as well as 130 mph wind uplift rating.
Universal ridge flashing in charcoal.
Remove the old roofing.
A metal roof is an alternative to a shingle covered roof but a metal roof can actually be installed over shingles.
They are available in a variety of colors and textures are low cost and provide a traditional aesthetic.
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.
Project panel corrugated 3 ft.
They also feature a 4 way interlocking system and a special water channel to allow constant water movement away from the roof deck.
Fiberglass core or matting an asphalt coating and a ceramic or stone granule surface give this material its durability.
Work at a comfortable steady pace trying not to rip up or carry off too much old roofing at once.
This is by far the most common way to install a metal roof.
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As long as the plywood under the shingle roof is in good condition this way can provide many benefits.
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See notes under metal roofing drawbacks regarding problems in the event of a house fire.
Metal roof over shingles condensation metal roofs must be laid flat on a vapor barrier because steel will condensate if there s any air space underneath it.
Galvanized steel which is created by using a soft layer of zinc to protect the inner layers is the most common type of steel roofing.
Put the steel down directly on a vapor barrier.
Although you can install corrugated metal roofing over shingles for the best foundation it is recommended that all the old roofing be removed.
It doesn t matter if the air space is a half inch or six inches because the condensation factor will remain the same.