Roofing Over Existing Flat Roof

Silicone acrylic and aluminum coatings.

Roofing over existing flat roof.

On the other hand a full replacement not only leaves you with a better looking higher quality roof it also protects the value of your home and could save you money in the long run. It is the process where roofers install a new roof over your existing one i e. Built up roofing bur was the most common type of flat roof before modified bitumen and membrane roofing were developed. 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.

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. 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. Bur consists of many layers. Once complete your new metal roof will add tremendous curb appeal become more energy efficient and have a decades long service life.

Flat roofs have three main options for their coatings. Roofing over an existing roof is also called reroofing or an overlay. 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. These coatings are liquid applied directly onto the roof surface and then cure once in place.

On the gable ends this was pretty easy. The fully adhered membrane wrapped down over the cut back roof deck to tie into the wall water control layer and air control layer photograph 11. Add a new layer of shingles which means that there is no tearing off of the old roof. Coatings are great flat roof replacement options because they can be directly applied to the roofing surface.

Roofing over an existing roof isn t necessarily the wrong choice. Installing a new roof over an existing one also called a layover or nailover is often possible although not always the best option. 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.