Membrane Roof Over Metal 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.

Membrane roof over metal roof.

Less labor is needed and there are much smaller refuse fees. Example of a single ply over metal retrofit assembly. Roof over materials 1. The ideal waterproofing method for metal roofs are liquid applied membranes.

Expect to pay in the range of 6 50 to 12 50 per sq. Single ply over metal. And metal roofs come in a variety of different profiles contours making waterproofing a challenge if using sheet type methods. Single ply roof systems are also lightweight and utilized for retrofits over existing metal roofs figure 2.

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. Cost installed per sq. The quality and type of underlayments used on the project in the long term will affect the overall performance of the roof. You don t have to do any work or remove any parts on the original roof.

Tar and gravel first let s talk about what makes a good tar and gravel roof work. Here are the advantages to installing a metal roof over. Many single ply membrane roofs rely on the existing metal roof to function as a structural deck for support and attachment of the 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.

Spray applied liquid roofing systems by their very nature being liquid will conform to any roof shape. The reinforcing fabric and bitumen binder are combined into a single roll which makes installation easier. Excluding water intrusion metal roofs are typically much less susceptible to damage from hail and physical damage than the membrane options. For a mechanically attached residential pvc 50 mil membrane installed over a flat or low slope roof on a single.

Aluminum is the most popular type of roof over for mobile home users and with good reason. A mobile home roof over creates a unique opportunity to completely change the look of the home. 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. 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.