Membrane Vs Metal Roof

However on most measures metal roofing holds its own.

Membrane vs metal roof.

Membrane roofing is often used on commercial flat roofs. Two common alternatives to tar and gravel are two ply membrane assembly and standing seam hidden fastener metal panels. The minimum allowed by code is 10 psf. Metal roofs were also constructed with durability in mind.

Just like rubber roofs metal roofs are virtually maintenance free. In fact the weight for a ballasted roof can range from about 15 pounds per sf psf to about 25 psf. Membrane roofing is available in a variety of cool roof coatings that help reduce the heat absorbed through the roof. Though you ll get more life out of a metal roof you ll pay the price at the time of installation.

In a ballasted roofing system the aggregate is usually stones at least an inch in diameter and applied heavily throughout the roof. 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. Tar and gravel first let s talk about what makes a good tar and gravel roof work. Metal roofs generally can run from 120 to 900 per 100.

This is when the roof membrane is held in place by aggregate. While standing seam metal roofs installed on steep slopes snap together and allow any water that gets under the metal to be shed by an underlayer low slope standing seam roofs also referred to as low slope ssr use hydrostatic joinery mechanically crimping the edges into interlocking seams filled with waterproofing. We also cover spray applied foam and liquid roofing options. Shingle roofs are cheaper up front.

In elevating the seams it helps protect a common weak point of the material which is the seam itself. Roof membranes discussed in this article include built up asphalt tar and gravel modified bitumen and single ply membranes like epdm pvc tpo and kee. Pvc membrane can be installed either as a mechanically attached system using hidden metal plates to secure the hidden or concealed overlapped parts of the membrane to the roof deck or as a fully adhered more expensive aka glued onto the roof deck system. 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.

As with single ply membranes there are toxicity concerns around some of the materials involved particularly coatings.