Standard Roof Overhang Dimensions

Overhangs are common in most house designs providing protection against both wind and rain.

Standard roof overhang dimensions.

For example a slope of 6 12 means for every 12 inches of horizontal distance the slope of the roof will rise 6 inches vertically. The exceptions include enclosed overhangs on open sidewalls i do not like the look and they become a nesting place for small flying critters and birds. 16 foot and taller 24 inch overhangs. In the example d calculates to 7 75.

The size of the roof overhang depends on the property. The ideal spec for roof overhangs. Another exception would be along eave sides with doors for weather protection longer overhangs generally work best. This means the example porch would need a 6 inch by 8 inch beam.

They are essential for framing and shading windows reducing splashback and getting rain to fall far enough away from the foundation. But roof overhangs are a great system to protect houses 3 stories and under. 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. The rise will be the elevation change over the 12 inches.

The length of the overhang depends primarily on the climate. The siding underneath the overhang is known as the soffit. A standard overhang is 16 24 inches but the overhang can be any length you wish. Calculate the initial value for d then round it up to the nearest inch.

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. On very tall buildings there are hardly any benefits of roof overhangs as the surface areas of the walls are so high. The run or the base number is 12 inches. 12 to 16 foot eaves 18 inch overhangs.

Roof overhangs are the amount that the roof hangs over the top of the siding in residential home construction. If the overhang exceeds 2 5 feet we will need to use a larger top chord for the overhang typically a 2 6 top chord for the truss.