Flat Roof Overhang Size

Measure your house at ground level then add in the roof s overhang for greater accuracy.

Flat roof overhang size.

You will need to express this size in terms of square feet. Input the rafter span on the flat eave overhang and pitch of the roof. Click the button to calculate the stock size needed for this job. Rafter stock size calculator.

Roof overhangs can extend farther than 2 feet but beyond this length they begin to lose structural integrity and require external supports. This will keep rain away from your shed. Two feet is the general maximum length for a typical roof overhang. Overhangs can vary from a few inches to a few feet depending on preference.

8d ring shank nails should be used instead. Roof drip edges are generally sold in 10 5 foot lengths but they are occasionally sold in 8 foot lengths or smaller. Sheathing should be a minimum of 19 32 inch thick. This profile of drip edge is shaped like a t with a lower flange at the bottom.

A shed overhang is an easy and effective way to protect your shed. Keep in mind that the average size of a roof is 1 700 square feet so your total will likely be 10 higher or lower than this figure. Check that your footage measurements are within this range so you can start off on the right foot. That said overhangs can extend as far as 2 without the need for external supports.

However the suggested width of an overhang is between 12 and 18 for eaves and no more than 8 for rakes. Roof sheathing comes in grid marked 4 by 8 foot sheets and should be installed perpendicular to the frame. This calculator is to be used as an estimating tool only. You can add 3 to 5 inches to the top.

The typical thickness range for sheathing is 3 8 to 3 4 inch. 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.