20×20 Pavilion Roof – Step by Step Plans

This step by step woodworking project is about 16×16 gable pavilion plans. This is the PART 2 of the large 20×20 pavilion project, where I show you how to build the gable roof. This is a straight forward process, so you can get the job done with basic tools and materials. Read the local codes before starting the project, so you comply with the requirements. 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.



Made from this plan




Pavilion roof plans

Building a 20x20 pavilion plans

Building a 20×20 pavilion plans



  • E – 22 pieces of 2×6 lumber – 169 3/4″ long RAFTERS
  • F – 12 pieces of 3/4″ plywood – 48″x96″ long, 6 pieces – 48″x48″ long, 4 pieces – 22 3/4″x96″ long, 2 pieces – 22 3/4″x48″ long ROOF
  • G – 2 pieces of 1×8 lumber – 240″ long TRIMS
  • H – 600 sq ft of tar paper, 600 sq ft asphalt shingles ROOFING



  • One week



Building a large pavilion roof

Building the rafters

Building the rafters

Use 2×6 lumber for the rafters. Mark the cut lines on the beams and then get the job done with a circular saw. It is essential to take accurate measurements, otherwise the rafters won’t fit into place tightly.

Fitting the rafters

Fitting the rafters

Place the rafters to the top of the pavilion every 24″ on center, equally spaced. Use rafter ties to lock the rafters into place tightly.

Side roof trims

Side roof trims

Fit the 1×8 trims to the sides of the roof. Align the edges and lock the boards into place with 2″ nails.

Roof sheets

Roof sheets

Cut the roof sheets from 3/4″ plywood at the right dimensions, as shown in the diagram. Fit the sheets to the roof of the pavilion and align the edges with attention. Leave no gaps between the sheets and then insert 1 5/8″ screws, every 8″ along the rafters.

Fitting the roofing

Fitting the roofing

Cover the roofing sheets with tar paper. Install the tar paper starting with the bottom of the roof and make sure the strips overlap for at least 2″. In addition, fit a 12” strip over the top ridge. Install the shingles starting with the left- bottom of the roof, after fitting the starting course. Use roofing tacks to secure the shingles into place.

20x20 Pavilion Plans

20×20 Pavilion Plans

Make sure you take a look over PART 1 of the project, so you learn how to build the frame of the square outdoor pavilion.

Smart Tip: Don’t forget to share your projects with me, as I love seeing what you guys are working on. Send me the pics HERE. In addition, take a look over the rest of my DIY projects HERE.



Thank you for reading our project about free 20×20 pavilion roof 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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