Leaving Shingles Under Metal Roof

You will want to install layer of underlayment between the old and new roofs.

Leaving shingles under metal roof.

However before you decide on reroofing with a metal roof you have to keep in mind that there are specific conditions that make reroofing with a metal roof safe. Well that s why the metal roof is such like an eco friendly product because you don t have to get rid of all of that stuff to the landfills. Metal roof flashing will still be needed around chimneys skylights and where roofs hit a wall sidewall endwall. Selecting the right underlayments for a lifetime metal roof should be a primary concern for anyone thinking about specifying or choosing to install a metal roof on their home.

The roofing is manufactured in panels that. 1 remove the shingles before installing the metal roof the first way to install a metal roof over shingles is by completely removing the old shingles before installing the new metal roof. Tin roofing also known as metal roofing is considered more durable than composition or wood shingles. It doesn t matter if the air space is a half inch or six inches because the condensation factor will remain the same.

Several of the contractor responses say why not leave perfectly good shingles under the metal roofing rather than remove them. However scratches down to the metal can be problematic. Installing wood stripping under a tin roof. But now that i said that i would tell you that if it was my house i probably would and the reason is i don t want to have all those old shingles under the roof.

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. Put the steel down directly on a vapor barrier. In some instances this can lead to punctures and tears that result in leaks. A benefit to doing it this way is that you can see if there is any rotten plywood that needs to be replaced before installing the new roof.

Some roofing contractors recommend reroofing with standing seam metal because the total roof weight is but a fraction of a standard asphalt shingle roof which helps preserve the roofing integrity. In addition metal roof pipe flashing will be needed for round pipes and penetrations. I would argue that putting sheet metal roofing over existing shingles if going to always look just at leat a little bit junky because the surface they are starting with is uneven and somewhat compressible. At some point during its lifecycle you can expect the metal panels to get scuffed or scratched.

Every situation will be different but generally speaking installing one of the more heavily textured metal roofs such as a corrugated vertical seam or or a horizontal metal shingle over your existing shingles should not be a problem.