Standard Roof Overhang Size

Metal is usually installed on rafters or strip sheathing rather than the solid decking used under other materials.

Standard roof overhang size.

I ve always felt overhangs should generally be proportionate to the height of the building being constructed with some exceptions of course due to function. A standard overhang is 16 24 inches but the overhang can be any length you wish. 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. 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.

Overhangs can vary from a few inches to a few feet depending on preference. There will be some overlap which comes down to individual preferences. At the rakes however with a nod to yankee frugality and clean modern lines we kept the roof trim as close to flush as practical while still allowing for a rain screen channel. Some slight overhang is recommended in conjunction with a drip edge flashing to prevent water from getting under the roofing and onto underlying wood.

This will protect a roof from most types of damage. Cantilevered structures are popular for homes with balconies. You can add 3 to 5 inches to the top. To create a cantilever properly you will need to know plenty about physics like torque and rotational equilibrium.

Pitch slope the pitch or slope is the incline of the roof expressed as a fraction describing the rise over the run. 12 to 16 foot eaves 18 inch overhangs. Two feet is the general maximum length for a typical roof overhang. A shed overhang is an easy and effective way to protect your shed.

With that in mind we kept a roof overhang at the eaves as it provides a nice shadow line and protects the second floor windows from a bit of the summer sun. 12 foot eaves and under 12 inch overhangs. The rise will be the elevation change over the 12 inches. A typical metal roof overhang may be 2 to 4 inches or even less.

That said overhangs can extend as far as 2 without the need for external supports.