# How to Build a Slanted Shed Roof

In order to build a slanted roof, one of your shed's walls must be higher than the other. If the shed walls are level with each other, you will need to build up one wall either by adding top plates or by constructing a small frame wall and adding it to your existing wall prior to constructing the slanted roof.

## Step 1

Measure the total span of the shed. The length of your common rafters will be based on the unit rise and total run, which is the total span minus the thickness of one wall. To measure this, hook your tape to the outside of one exterior wall and measure to the inside of the opposite exterior wall.

## Step 2

Measure the total rise of the shed slant roof. The total rise is how many inches your roof rises per 1 foot. A good way to get the unit rise is by measuring how much higher your one wall is from the other and then add the thickness of the common rafter to this number minus the seat cut. Take this number in inches and multiply it into your total run in feet. When you have this number, divide it by 12. Twelve is how many inches are in a foot. This will tell you how long the common rafter will need to be to span the shed from outside of one wall to the inside of the other wall. When you purchase the common roof rafters you will add extra length to the common rafters for the overhangs on each side and the thickness of one wall. The overhang length will be up to you.