Light weight shed roofing felt is not suitable for flat roof construction.
Flat roof felt thickness.
The product can be used as a waterproofing coating on asphalt fibre cement sheeting concrete and bituminous roofing membranes.
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.
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.
8d ring shank nails should be used instead.
As opposed to old built up felt roofing with joins new single ply waterproof membranes are now most commonly used.
Never attach roof sheathing with staples.
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.
Roofing felt s thickness is actually measured in pounds per square with one square equaling 100 feet of roofing material.
When it comes to estimating the weight of an existing roof field verification of the in place construction is necessary.
Roofing felt s thickness is not a measurement of its depth because it is thin similar to heavy paper.
The typical thickness range for sheathing is 3 8 to 3 4 inch.
Make sure the roof is clean dry and that all nail heads are flush with the deck.
A built up roof bur sometimes called a tar and gravel roof is a tried and true style of flat roof.
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.
The underlying deck must be constructed of moisture tolerant materials such as 18mm wbp plywood or suitable chipboard stirling board on treated timber joists.
Pvc membranes are easy to maintain and repair.
Sheathing should be a minimum of 19 32 inch thick.
Cold roofs and warm roofs.
The most commonly used felts are 15 and 30 with weights of 8 and 20 pounds per 100 square feet respectively.
Anderson tecnatorch sbs torch on mineral felt capsheet is used as the final layer of the felt roofing process.
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.
Of course how many rolls you need will depend on the size of the roof so ensure you measure correctly.
