Standard Roof Overhang Dimensions

16 foot and taller 24 inch overhangs.

Standard roof overhang dimensions.

Pitch slope the pitch or slope is the incline of the roof expressed as a fraction describing the rise over the run. The size of the roof overhang depends on the property. Calculate the initial value for d then round it up to the nearest inch. Roof overhangs are the amount that the roof hangs over the top of the siding in residential home construction.

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 siding underneath the overhang is known as the soffit. Overhangs are common in most house designs providing protection against both wind and rain. This tells you the size of the beam needed to support the porch s roof.

The length of the overhang depends primarily on the climate. The ideal spec for roof overhangs. 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. The run or the base number is 12 inches.

A standard overhang is 16 24 inches but the overhang can be any length you wish. 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. They are essential for framing and shading windows reducing splashback and getting rain to fall far enough away from the foundation. 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.

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 rise will be the elevation change over the 12 inches. Roof overhangs might look relatively routine but there is a lot of design thinking that goes into creating the optimal dimensions for each one. On very tall buildings there are hardly any benefits of roof overhangs as the surface areas of the walls are so high.

12 to 16 foot eaves 18 inch overhangs. Another exception would be along eave sides with doors for weather protection longer overhangs generally work best.