Leaving Shingles Under Metal Roof

In addition metal roof pipe flashing will be needed for round pipes and penetrations.

Leaving shingles under metal roof.

You will want to install layer of underlayment between the old and new roofs. Metal roof flashing will still be needed around chimneys skylights and where roofs hit a wall sidewall endwall. Overgrown trees debris and even snow can scuff up the surface. The quality and type of underlayments used on the project in the long term will affect the overall performance of the 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. Even if you leave your shingles you will need to remove ridge venting material and caps. 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. At some point during its lifecycle you can expect the metal panels to get scuffed or scratched.

Put the steel down directly on a vapor barrier. However scratches down to the metal can be problematic. It doesn t matter if the air space is a half inch or six inches because the condensation factor will remain the same. Tin roofing also known as metal roofing is considered more durable than composition or wood shingles.

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. In some instances this can lead to punctures and tears that result in leaks. 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. 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.

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. 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. The roofing is manufactured in panels that. 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.

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.