20×20 Gable Shed Roof Free – PDF Download

This step by step woodworking project is about free 20×20 gable shed roof plans. This is PART 2 of the large shed project, where I show you how to build the gable shaped roof. The pitch is 4 1/2 : 12. Check out the rest of the projects for detailed instructions on how to make the frame for the shed. Read the local codes and make sure you comply with the regulations. See my other DIY projects HERE.

We recommend you to invest in the best materials you could afford. Therefore, you should buy weather-resistant lumber, such as pine or cedar. Always take accurate measurements before adjusting the size of the components at the proper size. Drill pilot holes trough the components before inserting the wood screws, to prevent the wood from splitting. See all my Premium Plans HERE.

Made from this plan

20×20 Gable Shed Roof – Free PDF Download

Building a 20×20 shed

Materials

• I – 9 pieces of 1/2″ OSB – 48″x96″ long, 1 piece – 48″x12″ long, 4 pieces – 48″x21 3/4″ long, 4 pieces – 48″x39 3/4″ long, 2 pieces – 48″x48 3/4″ long  SIDING
• H – 2 pieces of 2×4 lumber – 144″ long, 1 piece – 240″ long, 2 pieces – 28 1/2″ long, 2 pieces – 57 3/4″ long 16xTRUSSES
• J – 8 pieces of 1/2″ plywood – 48″x96″ long, 4 pieces – 48″x48″ long, 4 pieces – 46 3/4″x96″ long, 2 pieces – 46 3/4″x48 long ROOF
• L – 520 sq ft of tar paper, 520 sq ft of asphalt shingles ROOFING
• K – 4 pieces of 2×4 lumber – 144″ long, 4 pieces of 1×6 lumber – 142 3/4″ long, 2 pieces – 135 1/4″ long, 2 pieces – 119 1/4″ long TRIMS
• K – 4 pieces of 1×4 lumber – 36″, 5 pieces – 43″ long, 2 pieces – 80″ long TRIMS

• 16 pieces of 2×4 lumber – 20 ft
• 36 pieces of 2×4 lumber – 12 ft
• 32 pieces of 2×4 lumber – 8 ft
• 520 sq ft of tar paper, 520 sq ft of asphalt shingles
• 6 pieces of 1×6 lumber – 12 ft
• 2 pieces of 1×6 lumber – 10 ft
• 7 pieces of 1×4 lumber – 8 ft
• 2 windows – 3’x3′
• 1 prehung door – 36″x80″
• 1 garage door – 84″x96″
• 16 pieces of 1/2″ plywood – 4’x8′
• 14 pieces of 5/8″ T1-11 siding – 4’x8′
• rafter ties
• 1 5/8″ screws, 2 1/2″ screws, 3 1/2″ screws
• 2″ nails
• wood filler, stain/paint
• shed storage system
• tie plate
• tie plate
• strong tie nails
• 1 1/2″ structural screws

Tools

• Safety gloves, glasses
• Miter saw, jigsaw
• Chalk line, tape measure, spirit level, carpentry pencil
• Drill machinery and drill bits

Time

• One Day

Building a gable roof for a 20×20 shed

Rafters

The first step of PART 2 if to build the trusses. I personally recommend you to go with engineered trusses, because they came at the construction site already assembled and they are designed for your local weather conditions. In this manner, the engineered trusses will provide the best cost to benefit ratio.

However, I will show you an idea on how I would build the trusses for myself. Use 2×4 lumber for the rafters and for the bottom chord. Use a miter saw to make the cuts to the rafters, as shown in the diagram.

Rafters truss

Lay the rafters on a level surface and then align the components, as shown in the diagram. You can set a jig to speed up the rest of the project.

W rafters

Use 2×4 lumber for the webs. Make the cuts according to the info in the diagram.

20 ft truss

Fit the webs to the trusses, as shown in the diagram. Leave no gaps between the components.

Gussets

Use strong tie plates to join the components together tightly with structural nails. Alternatively, you can use 1/2″ plywood for the gussets. Lay the gussets over the joints and align the edges flush. Drill pilot holes and insert 1 5/8″ screws. You could add construction glue to the joints. In addition, the best would be to add gussets on both sides of the trusses.

Fitting the trusses

Fit the trusses to the top of the storage shed. Place the trusses every 16″ on center and use a spirit level to plumb them. Use rafter ties to secure the rafters into place tightly.

Front wall panels

Use T1-11 siding sheets cover the front and the back of the storage shed. Align the edges flush and leave no gaps between the sheets. Insert 8d nails to secure the sheets into place tightly.

Back wall panels

Roof sheets

The next step of the project is to attach the 1/2″ plywood sheets to the top of the roof. Align the edges flush and then lock them to the rafters, every 8″, using 1 5/8″ screws. Make sure you leave no gaps between the sheets for a nest result. You can use other patterns for laying the sheets, as well.

Overhang supports

Use 2×4 lumber for the overhang supports. There are basically identical with the truss rafters. Fit them to the front and back gable ends of the shed. Drill pilot holes and insert 3 1/2″ screws to secure these supports into place.

Roof overhangs

Use 1×6 slats for the actual overhangs. Cut the boards as shown in the diagram and then lay them to the supports. Leave no gaps between the roof sheets and the overhang boards. Drill pilot holes through the overhang slats and insert 2 1/2″ screws into the supports.

Side roof trims

Fit the 1×6 trims to the sides of the roof. Use 8d nails to lock the trims into place tightly.

Fitting the roofing

The next step of the woodworking project is to cover the roof with felt. As you can see in the image, you need to make sure the strips of roofing felt overlap at least 2”. In addition, you have to lock the tar paper to the plywood sheets with staples. Next, you should install the shingles to the roof of the large shed. Start with the bottom of the roof, by fitting the first course, as in the image. Use roofing tacks to secure the shingles to the roofing sheets.

Start the first course with a full tab, the second with 2 1/2 tabs, the third with 2 tabs, the forth with 1 1/2 tabs, the fifth with 1 tab, the sixth with half tab and the seventh with a 3 tabs. Secure the shingles with roofing tacks.

Side wall trims

Fit the windows to the side of the shed. Also install the door. Install trims with a decorative purpose. Use 6d finish nails to secure the trims into place.

20×20 shed plans free

Last but not least, you need to take care of the finishing touches. Therefore, fill the holes with wood putty and then smooth the surface with sandpaper. Apply a few coats of paint or stain over the components to enhance the look of the shed and to protect the components from decay.

20×20 shed plans

If you want to build the frame for this gable storage shed, you should check out PART 1 of the project. If you like my project, don’t forget to SHARE it on Facebook and Pinterest. Since you are already here, you might as well take a look over my 16×20 pole barn plans. A pole bars has numerous advantages over a shed framing, so that will be an useful read.

Thank you for reading our project about free 20×20 gable shed roof shed plans and I recommend you to check out the rest of the projects. Don’t forget to LIKE and SHARE our projects with your friends, by using the social media widgets. SUBSCRIBE to be the first that gets our latest projects.

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