How to Build a Slanted Shed Roof

What You'll Need
Sliding T-bevel
Carpentry tools, like carpenter's square
Measuring Tape
Framing square
Reciprocating saw

Having a shed on your property grants you extra space for storage, construction projects, and more. One of the most important aspects of building a shed is building a sturdy roof. A slanted shed roof can easily be built if one of the walls of the shed stands taller than the opposite one. If both walls are the same height, you can either raise one by adding plates to it, or you can build a frame for the wall separately and then install this on top of the wall.

Once your walls are uneven, you can build a slanted roof to fit.

Step 1 — Measuring the Shed Span

The span of the shed must be measured accurately. The necessary length of the common rafters can be determined only after the shed span has been noted because their length is derived from taking the total span of the shed and subtracting the thickness of one wall from the number.

Step 2 — Measuring the Rise of the Slanted Roof

The rise of the roof is the measurement of the degree of increase in the roof per 1 foot. This is measured in inches. To measure the rise of the roof, take the difference in lengths of the two walls. Once you have this figure, add it to the depth of the common rafter, and then subtract from this number the value of the seat cut. This figure should be noted in inches and then multiplied by the length of the run, noted in feet.

Once you have this figure, divide it by 12. The number that you now have is the measurement of the common rafter needed for spanning an external wall and reaching the inner side of the opposite wall.

Step 3 — Cutting the Common Rafter Seats

Note down dimensions for common rafter seats and begin cutting. The seat cuts are for placing the common rafters on the wall plates. Note the measurements, mark them, and transfer them using a carpenter's square, measuring tape, and a pencil.

Step 4 — Making the Other Seat Cut

Make the cuts for the other seat cut with a reciprocating saw. Take any safety measures neccessary as provided by the saw's manual, including wearing safety goggles. Noting the distance from the heel plumb line, take down the dimensions of the entire run of the common rafter. Take the carpenter’s square and repeat the process in the above step. Once you are done, the two seat cuts will be facing the same side.

Step 5 — Adding the Final Touches

Use the saw on the rafters that remain and then arrange them out properly, using nails to bind them together. If needed, you can also use fillers and block stiffeners. Use chalk to mark the boundaries of the overhangs as desired. The sliding T-bevel can be used for denoting the outer edge.

Take the fascia rafters and fascia board and put them into place on the opposite end. Experts advise using lookouts with ladder framing to go along with fascia rafters. Once the slant roof has been put in, finish the layout work and then nail the plywood into place. Then, you're ready to add shingles.