Membrane Roof Over Metal Roof

Two common alternatives to tar and gravel are two ply membrane assembly and standing seam hidden fastener metal panels.

Membrane roof over metal roof.

Here are the advantages to installing a metal roof over. Roof over materials 1. Additionally pvc roofs are consistently chosen by homeowners looking to install an eco friendly green system over their flat or low slope roof. Single ply roof systems are also lightweight and utilized for retrofits over existing metal roofs figure 2.

Excluding water intrusion metal roofs are typically much less susceptible to damage from hail and physical damage than the membrane options. Many single ply membrane roofs rely on the existing metal roof to function as a structural deck for support and attachment of the roof. The quality and type of underlayments used on the project in the long term will affect the overall performance of the roof. Spray applied liquid roofing systems by their very nature being liquid will conform to any roof shape.

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. For a mechanically attached residential pvc 50 mil membrane installed over a flat or low slope roof on a single. 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. A mobile home roof over creates a unique opportunity to completely change the look of the home.

Cost installed per sq. Example of a single ply over metal retrofit assembly. 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.

The ideal waterproofing method for metal roofs are liquid applied membranes. The reinforcing fabric and bitumen binder are combined into a single roll which makes installation easier. 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. You don t have to do any work or remove any parts on the original roof.

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. 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. Aluminum is the most popular type of roof over for mobile home users and with good reason. Less labor is needed and there are much smaller refuse fees.