16+ Roofing Over Existing Flat Roof Gif. While its not designed to be a water most flat roofs are typically not as long lasting or durable as sloped ones, because the latter shed snow and rain a lot quicker. Inspect the condition of the existing roof and roof deck for numer of roof layers, soundness of roof decking, smoothness of existing roof installation, and other factors that determine.
Seam roof of aluminum and copper. Install roof on new construction. It is the process where roofers install a new roof over your existing another reason is curling shingles, as you can only install a new layer if the first one is completely flat and level.
Installing metal roofing over shingles is the best solution.
After the existing substrate is prepared, either by cleaning or removing the existing roof, the insulation is installed. Metal roofs may be installed over an existing roof with or without a diyer adding insulation in between. Sloped roofs are usually tiled or asphalt shingle where complete coating is not recommended. After the existing substrate is prepared, either by cleaning or removing the existing roof, the insulation is installed.