Metal Roof On Top Of Old Shingles

While metal roof systems are one of the most durable and environmentally friendly roofing material available on the market it does come with its fair share of disadvantages.

Metal roof on top of old shingles.

Metal roofing can be installed over top of shingles. The metal roofing is then secured to these slats of wood on the roof. No you do not have to tear off your shingle roof. By removing the old roof before the new roof s installation you are able to give the underlayment a thorough inspection to ensure there are no damages that could cause leaks or other issues with your new roof.

As you probably know a metal roof is a major initial investment so knowing some of the drawbacks of this roofing material is important. It is easier to do with more heavily textured metal roofs such as exposed fastened corrugated products and metal shingles. Many many metal roof installations are over existing shingles. Standing seam roofs may have unevenness of the old shingles telegraphed through and cause ripples in the standing seam.

This makes it a perfect material to be installed right on top of an existing shingle roof. One big advantage to metal roofing is its light weight which means metal roofing can be installed over an existing shingle roof. A common installation tactic for adding metal roof over shingles is to add small slats of wood and secure those slats of wood to the roof decking. The low weight of metal encourages this.

Installing a metal roof over shingles can also result in an increased chance of trapped water vapor and moisture between the new roof and old roof resulting in new mold and rot. However there are some things that you will want to check out before doing it this way. A metal roof is an alternative to a shingle covered roof but a metal roof can actually be installed over shingles. One of the major advantages of metal roofing is that it is very lightweight.

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. 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. These slats of wood run perpendicular to the metal roofing itself. Otherwise you will need to remove the shingles.

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. For one you will need to check with your local building department and ask if this is an approved installation method.