Membrane Roof Over Metal Roof

Selecting the right underlayments for a lifetime metal roof should be a primary concern for anyone thinking about specifying or choosing to install a metal roof on their home.

Membrane roof over metal roof.

For a mechanically attached residential pvc 50 mil membrane installed over a flat or low slope roof on a single. Polymer modified roof membranes often referred to as modified bitumen are an improvement over built up roof systems and have been in use since the 1960s. A mobile home roof over involves placing a new roof or roofing material over your existing roof there s little to no material removed which can keep costs down. You don t have to do any work or remove any parts on the original roof.

Single ply roof systems are also lightweight and utilized for retrofits over existing metal roofs figure 2. Roof over materials 1. However they can be more susceptible to corrosion from salt spray or chemicals than conventional roof systems such as shingles single ply or modified bitumen in conventional construction the structure. Two common alternatives to tar and gravel are two ply membrane assembly and standing seam hidden fastener metal panels.

Aluminum is the most popular type of roof over for mobile home users and with good reason. Single ply over metal. Many single ply membrane roofs rely on the existing metal roof to function as a structural deck for support and attachment of the roof. Expect to pay in the range of 6 50 to 12 50 per sq.

And metal roofs come in a variety of different profiles contours making waterproofing a challenge if using sheet type methods. If you have a tar and gravel low slope roof typical of constructions in many areas in montreal you may consider changing the roofing material to something else. The quality and type of underlayments used on the project in the long term will affect the overall performance of the roof. Less labor is needed and there are much smaller refuse fees.

Cost installed per sq. The reinforcing fabric and bitumen binder are combined into a single roll which makes installation easier. Here are the advantages to installing a metal roof over. Spray applied liquid roofing systems by their very nature being liquid will conform to any roof shape.

Excluding water intrusion metal roofs are typically much less susceptible to damage from hail and physical damage than the membrane options. Example of a single ply over metal retrofit assembly. The ideal waterproofing method for metal roofs are liquid applied membranes. Due to the configuration of the metal roof panels it is first necessary to install an eps expanded polystyrene insulation in between the metal ribs of the roof panels to create a smooth surface to support the 1 1 2 iso polyisocyanurate roof insulation over which the 60mil white tpo roofing membrane is installed.