12x20 Backyard Pavilion - Gable Roof Plans

This step by step diy woodworking project is about a 12×20 backyard pavilion gable roof plans. This is PART 2 of the large rectangular pavilion project, where I show you how to build the roof and how to attach the decorative trims. The roof has a 26.5 degree slope, which you can adjust to suit your needs and the local building codes. The roof pitch is 6:12. 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

12×20 Backyard Pavilion – Gable Roof Plans

Building a 12×20 pavilion

Cut & Shopping Lists

F – 36 pieces of 2×6 lumber – 96″ long RAFTERS
G – 2 pieces of 1/2″ plywood – 48″x76″ long, 2 pieces – 48″x96″ long, 2 pieces – 48″x92″ long, 2 pieces – 28″x45 3/4″ long, 4 pieces – 45 3/4″x96″ long, 2 pieces – 45 3/4″x44″ long ROOF SHEETS
H – 4 pieces of 1×8 lumber – 97 3/4″ long, 4 pieces – 132″ long TRIMS
I – 380 sq ft of tar paper, 380 sq ft of asphalt shingles ROOFING

36 pieces of 2×6 lumber – 8′
12 pieces of 1/2″ plywood – 4’x8′
4 pieces of 1×8 lumber – 10′
4 pieces of 1×8 lumber – 12′
380 sq ft of tar paper, 380 sq ft of asphalt shingles
rafter ties
1 5/8″ screws, 2″ nails
1 1/2″ structural 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

PART 1: 12×20 Pavilion Plans
PART 2: 12×20 Pavilion Roof Plans

How to build a 12×20 pavilion roof

Rafters

Use 2×6 lumber for the rafters. Use a miter saw to make the 26.5 degree cuts at both ends of the beams. 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 – 12×20 pavilion

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.

Roof sheets

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

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.

Fitting the gable end 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.

12×20 Pavilion – 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. Make sure you take a look over PART 1 of the project, where I show you how to build the frame of the pavilion.

12×20 Pavilion Plans

Fill the holes with wood putty and let them dry out for a few hours. Smooth the surface with 100-220 grit sandpaper and remove the residues with a damp cloth. This pavilion has large openings on all sides and it will be a beautiful relaxation are for your property.

Top Tip: Apply a few coats of paint or stain to the components, to enhance the look of the project. Make sure you take a look over the rest of my pergola/gazebo/pavilion plans HERE. See all my free woodworking plans (over 1000) HERE.

This woodworking project was about 12×20 door pavilion plans free. 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. Feel free to SHARE my plans with your friends.