2 Layers Of Roof Rafters

When you cut the rafters you ll need to make 3 separate cuts.

2 layers of roof rafters.

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. Rafters rafters make up the main framework of all roofs. They vary in size depending on length and spacing. 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.

Simply put it s a shallow roof. A roof is one of the most vital components of a house. When framing a roof figure 7 2 carpenters must be familiar with commonly used roofing terms figures 7 3 and 7 4. Replacing a roof can be very expensive and exhausting at the same time.

If the old roof has slate clay cement asbestos tile or wood shakes the installer must remove the material. On most flat roofs such as epdm tpo or modified it is perfectly acceptable to two layers of roofing. They are inclined members spaced from 16 to 48 inches apart. The most common rafter spacing is 24 inches and 5 8 inch plywood is recommended for that.

Posted july 31 2018 by onpage marie. For many years it was acceptable to put even the third layer. The tops of inclined rafters are fastened to the ridge. Asphalt shingles typically can have one more layer added over the top two roofs total.

Don t be afraid to pay up to 100 for a well documented report with photos showing what they found. 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. For rafters spaced 20 or more inches apart 1 2 or 5 8 inch plywood is recommended. To shed water away from the eave most roofers add a metal drip edge right to the roof deck covering it with the membrane.

Steep sloped roof products such as tile slate metal and shakes only allow one layer. 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. 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.