Flat Roof Felt Thickness

As opposed to old built up felt roofing with joins new single ply waterproof membranes are now most commonly used.

Flat roof felt thickness. A typical flat roof repair costs at least 350 400 and involves locating sources of leaks and patching the seams or holes. It s available in rolls that are 8m long and 1m wide with a thickness of 4 2mm mineral or 3 8mm sand. Never attach roof sheathing with staples. Pvc membranes are easy to maintain and repair.

Make sure the roof is clean dry and that all nail heads are flush with the deck. Sheathing should be a minimum of 19 32 inch thick. Roofing felt s thickness is not a measurement of its depth because it is thin similar to heavy paper. However depending on the severity of the damage and the type of material installed repairing a flat roof can cost as much as 600 800.

The product can be used as a waterproofing coating on asphalt fibre cement sheeting concrete and bituminous roofing membranes. Cold roofs and warm roofs. A built up roof for example will typically include the built up membrane itself with or without gravel as well as some kind of insulation and cover board which will vary in thickness from roof to roof. 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.

Of course how many rolls you need will depend on the size of the roof so ensure you measure correctly. The typical thickness range for sheathing is 3 8 to 3 4 inch. Roofing felt s thickness is actually measured in pounds per square with one square equaling 100 feet of roofing material. The underlying deck must be constructed of moisture tolerant materials such as 18mm wbp plywood or suitable chipboard stirling board on treated timber joists.

8d ring shank nails should be used instead. There are two types of flat roof. 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. Here alternating layers of roofing felt usually fiberglass and hot applied asphalt are combined to create a long lasting roof system.

The most commonly used felts are 15 and 30 with weights of 8 and 20 pounds per 100 square feet respectively. Ikopro solvent free water proofer is an easy to use bitumen based emulsion for roofs. Light weight shed roofing felt is not suitable for flat roof construction. A built up roof bur sometimes called a tar and gravel roof is a tried and true style of flat roof.