15×20 Pavilion Roof Plans

This step by step diy woodworking project is about a 15×20 outdoor pavilion roof plans. This is PART 2 of the rectangular pavilion project, where I show you how to build the roof and how to attach the railings. The roof has a 12:6 pitch, but you easily adjust it, if you need something elese. Take a look over the rest of my woodworking plans, if you want to get more building inspiration.

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

15×20 Pavilion Roof Plans

Building-a-15×20-pavilion

Cut & Shopping Lists

• E – 32 pieces of 2×6 lumber – 120″ long RAFTERS
• F – 8 pieces of 3/4″ plywood – 48″x96″ long, 4 pieces – 48″x48″ long, 4 pieces – 21 1/4″x96″ long, 2 pieces – 21 1/4″x48″ long ROOF SHEETS
• G – 4 pieces of 1×8 lumber – 121 3/4″ long, 2 pieces – 240″ long TRIMS
• H – 500 sq ft of tar paper, 500 sq ft of asphalt shingles ROOFING
• I – 8 pieces of 6×6 lumber – 81 3/4″ long, 8 pieces – 72 3/4″ long, 16 pieces – 21″ long RAILS

• 32 pieces of 2×6 lumber – 10′
• 13 pieces of 3/4″ plywood – 4’x8′
• 2 pieces of 1×8 lumber – 20′
• 4 pieces of 1×6 lumber – 12′
• 16 pieces of 6×6 lumber – 8′
• 400 sq ft of tar paper, 400 sq ft of asphalt shingles
• rafter ties
• 1 5/8″ screws, 2″ nails, 2 1/2″ screws
• wood glue, stain/paint

Tools

 Hammer, Tape measure, Framing square, Level

 Miter saw, Drill machinery, Screwdriver, Sander

 Safety Gloves, Safety Glasses

Time

 One day

Related

• PART 1: 15×20 Pavilion Plans
• PART 2: 15x20 Pavilion Roof Plans

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How to build a 15×20 pavilion roof

Building-the-rafters

Use 2×6 lumber for the rafters. Make 26.6 degree cuts to both ends of the 2×6 rafters. Mark the cut lines to the rafters and then get the job done with a circular saw. Smooth the edges with sandpaper. Make the notches into the rafters, so you can fit them into place tightly.

Fitting-the-roof-rafters

Fit the rafters to the top of the pavilion, using the information from the diagram. It is important to space the rafters properly (every 16″ on center), otherwise you won’t be able to attach the roofing sheets. Use rafters ties to lock the beams into place.

Fitting-the-roof-sheets

Use 3/4″ plywood for the roof of the pavilion. Cut the sheets at the right dimensions and then lay them to the top of the pavilion. Leave no gaps between the sheets and then insert 1 5/8″ screws, every 8″ along the rafters, so you can secure them into place tightly.

Side roof trims

Fit 1×8 trims to the sides of the pavilion. Align the edges with attention and insert 2″ nails to lock them into place tightly.

Front and back roof trims

Fit the 1×8 trims to the front and back of the pavilion. Make the angle cuts to the trims before locking them into place with 2″ nails.

Fitting the roofing

Cover the roof with tar paper and then install the asphalt shingles. Make sure you also install the appropriate drip edges, so you can seal the shed roof. Read the manufacturer’s instructions for a tight fit.

Building the rails

The next step of the project is to build the rails for the outdoor pavilion. Cut all the components from 6×6 lumber at the right dimensions. Drill pocket holes at both ends of the components and on both sides of the components. Align the edges with attention, check if the corners are square and then insert 2 1/2″ screws to lock everything together tightly.

Fitting the rails

Fit the railings to the pavilion, as show in the diagram. Cut wooden pieces to. Insert 2 1/2″ screws through the pocket holes to secure the railings to the posts.

15×20 pavilion plans – Side view

Fill the holes with wood putty and let them dry out for a few hours. Smooth the surface with 100-200 grit sandpaper and remove the residues with a damp cloth. Apply a few coats of stain or paint to enhance the look of the pavilion.

15×20 pavilion plans – top view

Don’t forget to take a look over PART 1 of the project, so you learn how to build the frame of the 15×20 pavilion. This pavilion is sturdy and it features a very elegant design that puts and emphasis on cost efficiency and durability. You can add railings to the exterior of the pavilion.

This woodworking project was about 14×16 backyard pavilion 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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