2 Layers Of Roof Rafters

For many years it was acceptable to put even the third layer.

2 layers of roof rafters.

Asphalt shingles typically can have one more layer added over the top two roofs total. When framing a roof figure 7 2 carpenters must be familiar with commonly used roofing terms figures 7 3 and 7 4. If the existing roof foundation is inadequate for the new roof or has two or more layers the rules prohibit the installation of a new roofing system. Posted july 31 2018 by onpage marie.

Pros and cons of adding a second layer of shingles. They vary in size depending on length and spacing. That means the roof doesn t shed water as easily as steeper roofs which is why choosing the right type of roofing material is so important. To shed water away from the eave most roofers add a metal drip edge right to the roof deck covering it with the membrane.

The ridge cut also called the plumb cut at the top of the rafter the birdsmouth cut which itself comprises 2 different cuts where the rafter meets the building s wall and the tail cut at the base of the rafter. Simply put it s a shallow roof. They are inclined members spaced from 16 to 48 inches apart. A 2 12 roof slope means your roof has 2 inches of vertical drop for every 12 inches of horizontal distance.

Steep sloped roof products such as tile slate metal and shakes only allow one layer. For rafters spaced 20 or more inches apart 1 2 or 5 8 inch plywood is recommended. If the old roof has slate clay cement asbestos tile or wood shakes the installer must remove the material. Replacing a roof can be very expensive and exhausting at the same time.

Get some other roofing companies minimum of 2 to inspect the roof and give you an assessment of the roof deck shingle condition and estimate to replace the roof deck shingles. The most common rafter spacing is 24 inches and 5 8 inch plywood is recommended for that. When you cut the rafters you ll need to make 3 separate cuts. Rafters rafters make up the main framework of all roofs.

A roof is one of the most vital components of a house. This synthetic layer which replaces felt paper covers the entire roof deck and is the second line of defense against leaks after the shingles. If you have done some serious research on roofing then you have probably heard about adding a second layer of shingles on top of the old ones.