12 Roof Overhang

A pitch over 9 12 is considered a steep slope roof between 2 12 and 4 12 is considered a low slope roof and less than 2 12 is considered a flat roof.

12 roof overhang.

Overhangs are common in most house designs providing protection against both wind and rain. The roof overhang refers to how much the edge of the roof goes beyond the house siding. Roof overhangs are the amount that the roof hangs over the top of the siding in residential home construction. Some slight overhang is recommended in conjunction with a drip edge flashing to prevent water from getting under the roofing and onto underlying wood.

Trusses are professionally designed with state of the art computer programs. Metal is usually installed on rafters or strip sheathing rather than the solid decking used under other materials. The overhang at the bottom of the slope is a simple overhang. The length of the overhang depends primarily on the climate.

The siding underneath the overhang is known as the soffit. Residential trusses save time and materials compared to conventional hand framing. They are essential for framing and shading windows reducing splashback and getting rain to fall far enough away from the foundation. Roof overhangs might look relatively routine but there is a lot of design thinking that goes into creating the optimal dimensions for each one.

That said overhangs can extend as far as 2 without the need for external supports. Truss capacity is. Each truss bears the truss plate institute tpi stamp for quality assurance. The roof overhang occurs in a similar way to the pent roof in that the top chord of the roof truss projects past the wall plate by the desired amount.

Measure your house at ground level then add in the roof s overhang for greater accuracy. Under the overhang is a structure known as the soffit. As an example if your overhang is 12 inches you ll add 2 feet to the overall length and 2 feet to the overall width of the house. Whereas the overhang on the gable end is a gable ladder.

Most roof s have a pitch in the 4 12 to 9 12 range. However the suggested width of an overhang is between 12 and 18 for eaves and no more than 8 for rakes. The lumber components are precision cut and assembled together with galvanized steel truss plates in a factory controlled environment. The table below shows common roof pitches and the equivalent grade degrees and radians for each.

This nominal square footage amount is then multiplied by a factor associated with the roof s pitch. A typical metal roof overhang may be 2 to 4 inches or even less.