12×20 Shed Roof Plans

This step by step diy woodworking project is about 12×20 shed roof plans. The project features instructions for building a gable roof for the 12×20 shed. In addition, this article shows you how to take care of the finishing touches for the shed. Make sure you take a look over the rest of plans to see alternatives and more projects for your garden.

When buying the lumber, you should select the planks with great care, making sure they are straight and without any visible flaws (cracks, knots, twists, decay). Investing in cedar or other weather resistant lumber is a good idea, as it will pay off on the long run. Use a spirit level to plumb and align the components, before inserting the galvanized screws, otherwise the project won’t have a symmetrical look. If you have all the materials and tools required for the project, you could get the job done in about a day. See all my Premium Plans HERE.

Projects made from these plans

12×20 Shed Roof Plans

Building a 12×20 shed roof

Cut & Shopping Lists

• A – 4 pieces of 1×4 lumber – 95 3/4″ long, 4 pieces – 93 3/4″ long, 4 pieces – 139 1/2″ long, 3 pieces – 234″ long, 2 pieces – 91″ long, 2 pieces – 36″ long, 2 pieces – 42 1/2″ long TRIMS
• B – 13 pieces of 2×4 lumber – 144″ long BOTTOM RAFTERS
• C – 2 pieces of 2×4 lumber – 36 1/4″ long, 1 piece of 2×6 lumber – 260″ long TOP RIDGE
• D – 30 pieces of 2×4 lumber – 96″ long RAFTERS
• E – 8 pieces of 3/4″ plywood – 48″x96″ long, 4 pieces – 48″x48″ long, 4 pieces – 10″x96 long ROOF
• F – 400 sq ft of tar paper, 400 sq ft of asphalt shingles ROOFING
• G – 4 pieces of 1×6 lumber – 99 3/4″ long, 2 pieces – 260″ long TRIMS

• 13 pieces of 2×4 lumber – 12′
• 31 pieces of 2×4 lumber – 8′
• 1 piece of 2×6 lumber – 22′
• 10 pieces of 1×4 lumber – 8′
• 4 pieces of 1×4 lumber – 12′
• 3 pieces of 1×4 lumber – 20′
• 3 pieces of T1-11 – 4’x8′
• 11 pieces of 3/4″ plywood – 4’x8′
• 9 pieces of 1×6 lumber – 10′
• tar paper – 400 sq ft
• asphalt shingles – 400 sq ft
• 1000 pieces of 1 5/8″ screws
• 1000 pieces of 2 1/2″ screws
• wood filler , wood glue, stain/paint

Tools

 Hammer, Tape measure, Framing square, Level

 Miter saw, Drill machinery, Screwdriver, Sander

 Safety Gloves, Safety Glasses

Time

 One day

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How to build a shed roof

Fitting-the-bottom-rafters

The first step of the project is to attach the bottom rafters to the shed. As you can easily notice in the diagram, you should place the 2×4 beams equally-spaced. Drill pilot holes through the slats and insert 3 1/2″ screws into the top plates (toe nail them).

In addition, you could use appropriate hardware to lock the rafters to the plates.

End bottom rafters

As you can see in the plans, the bottom rafters placed at both ends of the roof need to cut differently. Therefore, use the miter saw to cut both ends of these rafters at 30 degrees.

Fitting the top ridge

Next, you need to attach the top ridge into place. Cut the supports from 2×4 lumber and secure them to the bottom rafters using 3 1/2″ screws. Use a spirit level to make sure the supports are plumb. Use L-brackets to enhance the rigidity of the structure.

Gable-rafters

Building the common rafters is the next step of your backyard project. Cut one end of the rafters at 60 degrees (set the miter saw at 30 degrees).

Fitting the rafters

Fit the rafters to the top of the shed, making sure you place them equally-spaced. Use hardware to lock the rafters to the top ridge and to the top plates.

Fitting the gable ends

Fit the T1-11 siding sheets to the gable ends of the shed. Leave no gaps between the sheet and lock the to the framing using 1 5/8″ screws. You might need to fit several 2×4 studs to enhance the rigidity of the gable ends.

Building the overhangs

Build the overhangs for the large shed, using the information from the diagram. Fit several 2×4 blockings to enhance the rigidity of the structure.

Fitting the roofing sheets

Fit the 3/4″ tongue and groove plywood sheets to the roof of the shed, as shown in the diagram.

Fitting the plywood sheet – Overhangs

Cut strips of 3/4″ plywood for the overhangs. Fit the pieces to the rafters and lock them into place using 1 5/8″ screws, every 8″ along the framing.

Fitting the roofing

Cover the roof of the shed with roofing felt, making sure the strips overlap at least 2″. Secure the tar paper to the plywood sheets with roofing staples. In addition, cut a 12″ piece for the top ridge. Fit the side drip edges over the roofing felt, while the bottom drip edges should be fit under.

Fitting the window trims

Cut the window trims at the right dimensions. Fit the 1×4 trims around the window, align the edges and secure them into place using 1 5/8″ nails.

Fitting the front trims

One of the last steps for this project is to attach the decorative 1×4 trims to the shed. Cut the trims at the right dimensions and lock them to the exterior siding with 1 5/8″ nails. Leave no gaps between the components for a professional result.

Back trims

Fit the trims to the back of the shed, using the information from the diagram.

Side trims

In addition, fit trims to the sides of the shed.

Building the rafter trims

Build the trims for the end rafters from 1×6 lumber. Make the cuts to both ends of the slats and secure them into place with 1 5/8″ brad nails.

Fitting the roof trims

Fit the 1×6 trims to the rafters, as shown in the diagram. Use brad nails to lock the trims into place. Leave no gaps between the components for a professional result.

12×20 Shed Plans

Last but not least, you should take care of the finishing touches, as to be able to continue the process with the rest of the steps. Fill the holes with wood putty and smooth the surface with fine-grit sandpaper.

Building a large shed

Top Tip: Check out the rest of the project, if you want to learn more about building the frame for the 12×20 shed.

This woodworking project was about 12×20 shed roof plans. If you want to see more outdoor plans, check out the rest of our step by step projects and follow the instructions to obtain a professional result.

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