Normal Roof Overhang Length

Roof overhangs are the amount that the roof hangs over the top of the siding in residential home construction.

Normal roof overhang length.

Some slight overhang is recommended in conjunction with a drip edge flashing to prevent water from getting under the roofing and onto underlying wood. But roof overhangs are a great system to protect houses 3 stories and under. The ideal spec for roof overhangs. Home architects have a number of different options when they are looking to protect doors entryways and windows.

This nominal square footage amount is then multiplied by a factor associated with the roof s pitch. The size of the roof overhang depends on the property. On very tall buildings there are hardly any benefits of roof overhangs as the surface areas of the walls are so high. Visit the roof framing page for more information on cutting roof rafters and visit the roof pitch calculator for determining rafter lengths based on rise and run.

The roof overhang length must be properly engineered to resist wind uplift. The siding underneath the overhang is known as the soffit. Metal is usually installed on rafters or strip sheathing rather than the solid decking used under other materials. A typical metal roof overhang may be 2 to 4 inches or even less.

Measure your house at ground level then add in the roof s overhang for greater accuracy. Overhangs are common in most house designs providing protection against both wind and rain. The length of the overhang depends primarily on the climate. 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.

By precutting all of the roof purlins to length and making any necessary adjustments in the last bay of the roof it should be possible to easily be within 1 16 th inch plus or minus. Because this style of a shed has a flat roof it can facilitate a wider overhang which is ideal for storage. The diagonal measures are actually relatively easy to get equal as it takes very little effort to shrink a long diagonal by several inches. Roof pitches in.

With a flat shed roof the roof simply extends past the wall plate to provide an overhang.