Installing Metal Roofing Over Existing Roof

This synthetic underlayment acts as a vapor barrier and a slip sheet the slip sheet allows the metal roofing to expand and contract without damaging the finish coating on the.

Installing metal roofing over existing roof.

If you want to install steel over asphalt your best choice for installing metal roofing is to use a steel shingle system like the one shown instead of the more common and more expensive standing seam steel. In a standing seam roof long single panels run vertically all the way from the eave to the ridge. The primary method for installing a metal roof over asphalt is to fasten a synthetic underlayment atop the existing shingles and then lay the metal roof over that. While metal roofs are routinely installed over existing shingle and asphalt roofs those existing roofs must be up to par for you to reap the long term benefits.

If you want to install steel over asphalt your best choice for installing metal roofing is to use a steel shingle system like the one shown instead of the more common and more expensive standing seam steel. By using roof huggers the existing roof can be left in place. Work up from the initial row starting at the lower corner in a diagonal pattern staggering the shingles to prevent gaps. How many layers are there.

If you have more than two layers of existing roofing material something s gotta give. Inspect the condition of your current roof. The condition of the existing roof is critical. Building officials in some areas will only allow a re roof over one layer of shingles while officials in other places may allow you to place the roof over two layers of shingles.

How to install a roof over an existing roof determine the feasibility. Multiple layers of shingles can make it difficult or impossible for the nails to penetrate. Use your neoprene washer head screws to secure the metal to the sheathing. This provides a safer environment for both workers inside the building and the roofers as they install the new roof.

However you ll want to check with your local building department before you make any decisions. How to install a metal roof over an existing roof. In a standing seam roof long single panels run vertically all the way from the eave to the ridge. Yes you can install a metal roof over shingles.

Make sure that the screws are all aligned evenly as you will be able to see them from the ground if they are. Lay the starter row of metal shingles at the drip edge and affix to the roof with metal roofing nails. With the existing roof left in place there are typically no leading edge safety issues. The roof should be in sound.

You will need to do a thorough inspection of your current roof. Lay a metal roofing panel over the existing roof material in the bottom corner of the roof surface and fasten to the roof according to. Metal roofing is also available in the form of shingles.