Normal Roof Overhang Length

On very tall buildings there are hardly any benefits of roof overhangs as the surface areas of the walls are so high.

Normal roof overhang length.

Roof pitches in. The length of the overhang depends primarily on the climate. Rafter span tables use these tables to determine lengths sizes and spacing of rafters based on a variety of factors such as species load grade spacing and pitch. 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.

This is particularly true in geographical regions where high winds are a common issue. But roof overhangs are a great system to protect houses 3 stories and under. The diagonal measures are actually relatively easy to get equal as it takes very little effort to shrink a long diagonal by several inches. 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 ideal spec for roof overhangs. A typical metal roof overhang may be 2 to 4 inches or even less. The siding underneath the overhang is known as the soffit. Measure your house at ground level then add in the roof s overhang for greater accuracy.

The roof overhang length must be properly engineered to resist wind uplift. 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. Home architects have a number of different options when they are looking to protect doors entryways and windows.

Overhangs are common in most house designs providing protection against both wind and rain. Some slight overhang is recommended in conjunction with a drip edge flashing to prevent water from getting under the roofing and onto underlying wood. With a flat shed roof the roof simply extends past the wall plate to provide an overhang. Metal is usually installed on rafters or strip sheathing rather than the solid decking used under other materials.

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.