Roofing Over Existing Flat Roof

Built up roofing bur was the most common type of flat roof before modified bitumen and membrane roofing were developed.

Roofing over existing flat roof.

Coatings are great flat roof replacement options because they can be directly applied to the roofing surface. It is an acceptable practice to install a new roof over an existing roof membrane system provided that the roof deck is structurally sound and has been properly prepared to support the added load. Silicone acrylic and aluminum coatings. One of the keys to over roofing is to tie the air control layer of the roof assembly to the air control layer of the wall assembly.

Roofing over an existing roof is also called reroofing or an overlay. Multiple layers of shingles can make it difficult or impossible for the nails to penetrate. Roofing over an existing roof isn t necessarily the wrong choice. Add a new layer of shingles which means that there is no tearing off of the old roof.

Bur consists of many layers. Inspect the condition of your current roof. These new roofs can be either low sloped less than 2 12 functional roofs or high pitched greater than 2 12 architectural roofs depending on the expectations of the building owner. Once complete your new metal roof will add tremendous curb appeal become more energy efficient and have a decades long service life.

These coatings are liquid applied directly onto the roof surface and then cure once in place. If your current roof is in good condition or you re really short on time it might be your best option. How to install a roof over an existing roof determine the feasibility. It is the process where roofers install a new roof over your existing one i e.

The use of metal retrofit roofs allows the flat roofed buildings to undergo a transformation into a sloped roof building. Flat roofs have three main options for their coatings. The roof should be in sound. Mcelroy metal s retrofit roofing systems consist of adding sub structural components to the existing flat roof to build a slope into the structure and provide a platform to install new metal roofing panels.

On the gable ends this was pretty easy. A bottom layer or two of insulation board multiple intermediate layers of tar or asphalt alternated with layers of roofing felt and a top layer of gravel.