18×18 Gable Pavilion Roof Plans

Ovidiu 4 GapDice RANDOM PLAN

This step by step diy woodworking project is about a 18×18 outdoor pavilion roof plans. This is PART 2 of the square pavilion project, where I show you how to build the gable roof with a 6:12 pitch. Take a look over the rest of my woodworking plans, if you want to get more building inspiration. Premium Plans for this project available Here. Check out the Shop, as well, for full list of Premium Plans.

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.



Projects made from these plans




18×18 Gable Pavilion Roof Plans




  • G – 24 pieces of 2×6 lumber – 12′ long RAFTERS
  • H – 10 pieces of 1/2″ plywood – 48″x96″ long, 6 pieces – 48″x72″ long, 4 pieces – 4’x4′ long ROOF SHEETS
  • I – 4 pieces of 1×8 lumber – 96″ long, 4 pieces – 49″ long, 2 pieces – 10 ft, 2 pieces – 12 ft TRIMS
  • K – 550 sq ft of tar paper, 550 sq ft of asphalt shingles ROOFING

 One day



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How to build a 18×18 pavilion roof



Use 2×6 lumber for the rafters. Use a miter saw to make the cuts to the boards. Smooth the edges with sandpaper. Make the notches to the rafters, as shown in the plans. Mark the lines before doing the cuts.

Fitting the rafters

Fitting the 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 rafters to the beams. Use 1 1/2″ structural screws for the rafter ties.

Roof sheets - 18x18 pavilion

Roof sheets – 18×18 pavilion

Use 1/2″ 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.

Fitting the side roof trims

Fitting the side roof trims

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



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. Fit the 1×8 trims to the front and back of the pavilion. Lock them into place with 2″ nails.

Fitting the roofing to the 18x18 pavilion

Fitting the roofing to the 18×18 pavilion

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.



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 120-220 grit sandpaper.

Apply a few coats of paint / stain to enhance the look of the pavilion and to protect them from the elements.

18x18 pavilion plans - front view

18×18 pavilion plans – front view

Don’t forget to take a look over PART 1 of the project, so you learn how to build the frame of the 18×18 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. Premium Plans for this project available Here. Check out the Shop, as well, for full list of Premium Plans.



This woodworking project was about 18×18 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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  1. Oscar R. at - Reply

    Do you have plans for a hipped roof for 18×18 pavilion

  2. Randy Flowers at - Reply

    I would like to buy the plans for this project however, when I clicked on the plans it said it was for 16X16, not 18X18.

    • Ovidiu at - Reply

      I fixed the link. Sorry for the error

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