16x20 Lean to Pavilion Roof Plans

This step by step diy woodworking project is about a 16×20 lean to pavilion roof plans. This is PART 2 of the pavilion project, where I show you how to build the lean to roof. This pavilion is super sturdy, but you could increase the slope of the roof to comply with the local building codes. 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

16×20 Lean to Pavilion Roof Plans

Building-a-lean-to-picnic-table

Cut & Shopping Lists

C – 2 pieces of 6×6 lumber – 240″ long, 4 pieces – 37″ long WALL FRAME
D – 1 piece of 6×6 lumber – 240″ long, 4 pieces – 18 1/2″ long SUPPORTS
E – 24 pieces of 6×6 lumber – 26 1/4″ long BRACES
F – 11 pieces of 2×6 lumber – 216″ long RAFTERS
G – 8 pieces of 3/4″ plywood – 48″x96″ long, 4 pieces – 48″x48″ long, 2 pieces – 24″x96″ long, 1 piece – 24″x48″ long ROOF
H – 2 pieces of 1×8 lumber – 217 1/2″ long, 2 pieces – 240″ long TRIMS
I – 400 sq ft of tar paper, 400 sq ft of asphalt shingles ROOFING

3 pieces of 6×6 lumber – 20′
11 pieces of 2×6 lumber – 18′
8 pieces of 6×6 lumber – 10′
12 pieces of 3/4″ plywood – 4’x8′
8 pieces of 1×8 lumber – 10′
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

PART 1: 16×20 Lean to Pavilion Plans
PART 2: 16x20 Lean to Pavilion Roof Plans
PART 3: 16×20 Lean to Pavilion Railings Plans

How to build a 16×20 picnic shelter roof

Top-wall-frame—pavilion

The first step of the project is to build the top wall frame. As you can see in the diagram, you need to use 6×6 lumber for the components. Align the edges with attention and make sure the corners are square. Drill pilot holes through the plates and insert 8″ screws to lock everything together tightly.

Fitting-the-roof-supports

Fit the wall frame to one side of the pavilion. Align the edges with attention, plumb the wall with a spirit level and then drill pilot holes. Insert 8″ screws to lock everything with attention tightly. Fit a support to the middle of the pavilion, as well. This support will hold the weight of the roof and provide a lot more support to the structure.

Braces to the tall wall

Use 6×6 lumber for the other braces. Make 45 degree cuts at both ends of the braces, as shown in the diagram. Use 5″ screws to secure the braces into place tightly.

Fitting the middle braces

Fit more braces to the roof structure.

Building-the-rafters

Use 2×6 lumber for the 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 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 24″ 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.

Roof trims

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

Side roof trims

Fit the 1×8 trims to thesides 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.

16x20 Lean to Pavilion Plans - Front view

16×20 Lean to Pavilion Plans – Front 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. Check PART 3 of the project so you learn how to build the railings.

16×20 Lean to 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.

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 16×20 outdoor 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.