Flat Roof Felt Thickness

Cold roofs and warm roofs.

Flat roof felt thickness.

Roofing felt s thickness is not a measurement of its depth because it is thin similar to heavy paper. Of course flat roofs are not flat but have a very slight roof pitch of between 1 4 to 1 2 per foot. The most commonly used felts are 15 and 30 with weights of 8 and 20 pounds per 100 square feet respectively. As opposed to old built up felt roofing with joins new single ply waterproof membranes are now most commonly used.

Roofing felt s thickness is actually measured in pounds per square with one square equaling 100 feet of roofing material. As the single ply roofing association spra points out this type of flat roofing is strong durable completely sealed and usually lasts at least 25 30 years. Most flat roofs are typically not as long lasting or durable as sloped ones because the latter shed snow and rain a lot quicker. A built up roof bur sometimes called a tar and gravel roof is a tried and true style of flat roof.

Of course how many rolls you need will depend on the size of the roof so ensure you measure correctly. Here alternating layers of roofing felt usually fiberglass and hot applied asphalt are combined to create a long lasting roof system. There are two types of flat roof. Just enough slope to drain water but also flat enough to be a problem if not constructed properly.

Ikopro solvent free water proofer is an easy to use bitumen based emulsion for roofs. The best weight for roofing felt is the 30 pound product because it provides thicker and stronger footing for roofers that does not tear out especially on steep roofs where footing is critical. Anderson tecnatorch sbs torch on mineral felt capsheet is used as the final layer of the felt roofing process. The product can be used as a waterproofing coating on asphalt fibre cement sheeting concrete and bituminous roofing membranes.

It s available in rolls that are 8m long and 1m wide with a thickness of 4 2mm mineral or 3 8mm sand. We would recommend a different covering such as grp fibre glass. However over the last few decades new and advanced materials have been developed.