8×20 Gambrel Shed Roof Plans

This step by step diy project is about 8×20 gambrel shed roof plans. This is PART 2 of the storage barn shed project, where I show you everything you want to know about framing the barn shaped roof. Take a look over the rest of my woodworking plans, if you want to get more building inspiration. Remember that you need to select the site for the shed with attention and that you have to comply with a few legal regulations.

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

8×20 Gambrel Shed Roof Plans

Building-a-8×20-gambrel-shed

Cut & Shopping Lists

• G – 4 pieces of T1-11 siding – 48″x109 3/4″ long, 10 pieces – 48″x61 1/2″ long SIDING
• H – 4 pieces of 2×4 lumber – 37″ long 16xTRUSSES
• I – 8 pieces of 2×4 lumber – 37″ long, 12 pieces – 4 1/4″ long 2xOVERHNAG
• J – 8 pieces of 3/4″ plywood – 8″x37″ long, 4 pieces – 37″x48″ long, 8 pieces – 37″x96″ long 2xOVERHNAG
• K – 8 pieces of 1×6 lumber – 37 1/2″ long ROOF TRIMS
• L – 300 sq ft of tar paper, 300 sq ft of asphalt shingles ROOFING
• M – 2 pieces of 2×4 lumber – 83″ long, 1 piece – 55″ long JAMBS
• M – 1 piece of T1-11 siding – 48″x80″ long, 2 pieces of 2×4 lumber –  DOOR

• 12 pieces of 2×4 lumber – 10′
• 4 pieces of T1-11 siding – 4’x10′
• 11 pieces of 5/8″ T1 -11 siding – 4’x8′
• 22 pieces of 2×4 lumber – 8′
• 11 pieces of 1/2″ plywood – 4’x8′
• 4 pieces of 1×6 lumber – 8′
• 8 pieces of 1×4 lumber – 8′
• 300 sq ft of tar paper, 300 sq ft of asphalt shingles
• rafter ties
• 2 1/2″ screws, 3 1/2″ screws, 1 5/8″ screws
• 4d nails, 16d nails, 6d nails
• 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 week

Related

• PART 1: 8×20 Barn Shed Plans 
• PART 2: 8×20 Barn Shed Roof Plans

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How to build a 8×20 barn shed roof

Rafters-for-8×20-gambrel-shed

Use a saw to make 22.5 degree cuts to both ends of the rafters. Use a miter saw and make a jig to speed up the process.

Fitting the gussets

Use 1/2″ plywood for the gussets. Mark the cut lines on the plywood and get the job done with a saw. Fit the gussets over the joints and then lock them to the joints with 1 5/8″ screws.

Ffitting-the-trusses-for-the-8×20-barn-shed

Fit the trusses to the top of the barn shed. Fit the trusses every 16″ on center and then plumb them vertically with a spirit level. Use rafter ties to secure the trusses into place tightly.

Side wall panels

Cut the T1-11 siding sheets for the sides of the shed, as shown in the diagram. Align the edges and leave no gaps between the sheets. Insert 6-8d nails, every 8″ along the framing.

Front wall panels

Use T1-11 siding sheets for the front panels. Use a circular saw to make the cuts around the door opening. Fit the sheets to the and align the edges flush. Insert 6-8d nails every 8″ along the framing. Fit the sheets to the back of the shed, as well.

Assembling the overhangs

Use rafters to the build the overhangs. Drill pilot holes though the rafters and insert 3 1/2″ screws into the blockings.

Fitting the overhangs – 8×20 shed

Fit the overhangs to the front and back of the barn shed. Align the edges with attention, drill pilot holes and insert 3 1/2″ screws to lock the overhangs to the shed frame.

Fitting-the-sheets-for-the-barn-shed

Use 1/2″ plywood for the roof sheets. Cut the sheets at the right dimensions and then lay them to the top of the gambrel roof. Align the edges and leave no gaps between the sheets and insert 1 5/8″ screws, every 8″ along the framing.

Front-roof-trims

Use 1×6 lumber for the front and back roof trims. Align the edges flush and insert 2″ nails, to secure the trims into place tightly.

Fitting the roofing to the barn shed

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 large piece for the top ridge. Fit the side drip edges over the roofing felt, while the bottom drip edges should be fit under.

Read the instructions labeled on the asphalt shingle packs before installing them into place tightly. Start with the bottom left side of the roof and install them all the way to the top.

Doors-for-large-barn-shed

Use T1-11 siding for the door panel. Use 2×2 lumber for the door frame. Use pocket holes and 2 1/2″ screws to assemble the door frame together tightly. Align the edges flush and make sure the corners are square. Attach the panel to the door frame, align the edges flush and insert 2″ nails to secure them together tightly, every 8″.

Door jambs – 8×20 barn shed

Attach the 2×4 lumber around the door opening. Make sure the edges are flush. Drill pilot holes and insert 2 1/2″ screws to secure the jambs into place tightly.

Fitting the door to the 8×20 gambrel shed

Fit the door to the opening and align the edges flush. Attach the door to the jambs with hinges. Install a latch to lock the door into place tightly.

Corner trims – 8×20 shed

Fit the 1×3 or 1×4 trims to the corners of the shed. Align the edges flush and insert 2″ nails to secure them every 8″ along the framing.

How to build a 8×20 gambrel shed

Apply a few coats of paint over the exterior siding and trims to protect the components from the elements and to make the shed eye catching.

8×20-gambrel-shed-plans

Make sure you check out PART 1 of the project, so you see how to build the frame for the shed. You should also know that I have tons of other shed plans, as well as other woodworking projects. See the full list HERE.

This woodworking project was about 8×20 barn 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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