Both can be used on commercial roofs and the best choice often depends on the business owners roofing needs and goals.

Two ply roofing. These membranes are particularly effective for roofs with a very low slope between 1 8 12 1 and. This warranty applies to low slope or near flat residential roofs up to 1 8 2 or 1 slope that use the outer perimeter instead of a drain to evacuate water. To minimize the chance of roofing system failures always remember to consider the quality of material being used. This provides two plies across the entire roof with three plies at the headlap.

The standard approach for two ply roofing underlayment is to lap a 36 inch roll by 19 inches. The use of the resisto self adhered waterproofing membrane as a first layer and the resisto granulated cap sheet high resistance hr cap sheet as a second layer is an ideal solution to ensure the waterproofing of low slope roofs. The resisto two ply low slope roofing system is protected by a 20 year system warranty against any manufacturing defect in the products. Housewrap should not be used for a vapor retarder because it has inadequate vapor flow resistance.

Whereas single ply roofing tends to break under pressure using two or three layers of a compound like polyester offers more resistance to punctures and elongation. Many of our commercial roofing customers do not know the differences between modified bitumen and single ply roofing systems. Vapor retarders are materials with a perm rating of 0 1 or less and are typically sheet materials such as 6 mil polyethylene a two ply built up membrane or a one ply modified bitumen sheet. One of the most popular types of commercial roofing systems we offer is the 2 ply sbs roof system also known as a torch on roof system this roofing assembly involves torched applied layers of polyester and fiberglass reinforced sbs membrane.

This roofing system is very durable but must be professionally installed. Multiple plies equals multiplied strength. The lap is half the width of the roll plus one extra inch for headlap. Following are some photos of a recent 2 ply modified bitumen membrane roofing system installation along with new eavestrough gutters installed by toronto roofing ca.

2 ply rubber roofing membrane is about five quarters in thickness about 3 8 and puncture resistant. Rubber roofing surface has embedded granular ceramics that protect against harmful uv degradation seams are torch fused together to prevent seam separation. Multi ply systems can be as thick as 300 millimeters much more than even the thickest single ply membranes.

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