Weight Of 3 Layer Felt Roof System

This includes the roof deck and the supporting structure typically roof trusses and or rafters as well as the roof system itself.

Weight of 3 layer felt roof system. The weight of roofing constructions above the truss rafter may be estimated with the calculator below. Don t forget to add all roof assembly materials when calculating total roof weight. Each of the three layers is laid in a half lap system so any joint in the roof is as far away as possible from another joint. This type of felt roof comes on rolls and is laid with the aid of a very large blow torch that heats and melts the rear of the felt melting it onto the roof structure below.

Atlantic single ply system 17000 system 17000 plus system 5000 classic commodity systems. Felt tar and slag roofing 3 ply 4 5 lb m ft 2 22 kg m 2 felt tar and slag roofing 4 ply 4 8 lb m ft 2 23 4 kg m 2. Please contact us if you have any queries by clicking here. Second layer is a sanded underlay which is to.

Of course how many rolls you need will depend on the size of the roof so ensure you measure correctly. If the slope is between 3 12 and 4 12 use two layers of 15 felt for asphalt shingles. They had a stereotypical belief they were only good enough for your shed or garage. Three layer felt systems have come a long way from the early days.

Typically it s applied as a 3 layer system usually consisting of a perforated underlay a 2mm underlay layer then thick 4 5mm felt. It s available in rolls that are 8m long and 1m wide with a thickness of 4 2mm mineral or 3 8mm sand. Three layer felt system. The type and amount of roofing felt to apply varies according to roof slope.

If the slope is greater than 4 12 which provides more water drainage from the roof use one layer of 15 felt. When it comes to estimating the weight of an existing roof field verification of the in place construction is necessary. None asphalt roll roofing 1 1 lb m ft 2. Melt the bitumen by heating on the underside of the membrane from a gas torch.

Anderson tecnatorch sbs torch on mineral felt capsheet is used as the final layer of the felt roofing process. The products used today are a 3 layer membrane system applied with the use of a gas gun. They are no longer laid with hot bitumen and have stone chippings put on top. Use our table below to compare membrane thickness and weight for our range of flat roofing.

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