20×40 RV Carport Gable Roof Plans

This step by step diy project is about 20×40 carport gable roof plans. This is PART 2 of the large RV carport project, where I show you how to build the gable roof. This carport has generous overhangs on the sides, front and back, so it can protect your RV or boat in a professional result. 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

20×40 RV Carport Gable Roof Plans

Building-a-20×40-rv-carport

Cut & Shopping Lists

• D – 2 pieces of 2×6 lumber – 168″ long, 1 piece – 240″ long, 1 piece of 2×4 lumber – 44 1/2″ long 21xTRUSS
• E – 4 pieces of 5/8″ siding – 48″x26″ long, 4 pieces – 48″x46″ long, 2 pieces – 48″x56″ long GABLE ENDS
• F – 4 pieces of 2×6 lumber – 168″ long, 12 pieces – 6 1/4″ long 2xOVERHNAGS
• G – 28 pieces of 3/4″ plywood – 48″x96″ long, 4 pieces – 48″x48″ long, 8 pieces – 24″x96″ long, 4 pieces – 24″x48″ long, 4 pieces – 10″x96″ long, 4 pieces – 10″x72″ long ROOF SHEETS
• H – 4 pieces of 1×8 lumber – 169″ long, 2 pieces – 499 3/4″ long TRIMS
• I – 1250 sq ft of tar paper, 1250 sq ft of asphalt shingles ROOFING

• 21 pieces of 2×6 lumber – 20′
• 53 pieces of 2×6 lumber – 14′
• 11 pieces of 2×4 lumber – 8′
• 5 pieces of T1-11 siding – 4’x8′
• 22 pieces of 3/4″ plywood – 4’x8′
• 8 pieces of 1×8 lumber – 16′
• rafter ties
• 1 5/8″ screws
• 1250 sq fr of tar paper, 1250 sq ft of asphalt shingles
• 2″ brad nails
• wood glue, stain/paint
• wood filler

Tools

 Hammer, Tape measure, Framing square, Level

 Miter saw, Drill machinery, Screwdriver, Sander

 Concrete mixer, Post hole digger

 Safety Gloves, Safety Glasses

Time

 One weekend

Related

• PART 1: 20×40 RV Carport Plans
• PART 2: 20×40 RV Carport Roof Plans
• Flat roof carport plans
• Lean to carport plans

How to build a 20×4022 carport gable roof

Building-the-rafters

The first step of the project is to build the trusses for the large RV carport. As you can easily notice in the diagram, you need to make the rafters from 2×6 lumber. Make the angle cuts to the rafters, using the information from the diagram. Lay the rafters on a level surface, as shown in the diagram.

Middle truss support

Use 2×4 lumber for the middle support. Fit everything on a level surface, align the components and leave no gaps between them. Use 1/2″ plywood for the gussets. Mark the cut lines on the plywood sheets and get the job done with a saw. Check if there are any any gaps between the rafters before attaching the gussets into place. Align the edges and use 1 5/8″ screws to lock the gussets into place.

Fitting-the-trusses

Fit the trusses to the top of the RV carport, making sure you place them every 24″ on center. Use a spirit level to plumb the trusses and lock them to the support beams with rafter ties. In addition, toenail the bottom rafters to the support beams, for extra rigidity.

Gable end panels

Fit T1-11 siding sheets to the front and back gable ends of the carport. Mark the cut lines on the sheets and then get the job done with a circular saw. Smooth the edges with sandpaper, for a professional result. Align the edges flush and leave no gaps between the sheets. Insert 6d nails every 8″ along the framing.

Assembling the overhangs

Assemble the overhangs for the front and for the back of the carport. You can adjust the size of the blockings to suit your needs. Drill pilot holes through the rafters and insert 3 1/2″ screws into the blockings.

Fitting-the-roof-sheets

Attach 3/4″ plywood sheets to the top of the carport. Start with the bottom left section of the carport and go up to the top. Leave no gaps between the sheets and secure them into place with 1 5/8″ screws, every 8″ along the framing.

Fitting the side roof trims

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

Roof trims

You also need to fit trims to the front and to the back of the roof. The trims will enhance the look of the carport and add value to your work. Use 1×8 lumber for the rafter trims. Align the edges with attention and secure them into place with 2″ screws. Drill pilot holes before inserting the screws, to prevent the wood from splitting.

Fitting the roofing

Install the roofing felt, starting from the bottom left of the roof. Secure the paper to the roofing, using a stapler. Make sure the tar paper overlaps at least 2”. Don’t forget to cover the top ridge with a 14” strip of paper .

Start the first course of shingles with a full tab, the second with 2 1/2 tabs, the third with 2 tabs, the forth with 1 1/2 tabs, the fifth with 1 tab, the sixth with half tab and the seventh with a 3 tabs.

How to build a 20×40 Rv Carport

Last but not least, you need to take care of the finishing touches. Fill the holes with wood putty and then smooth the surface with sandpaper. Apply a few coats of paint or stain to protect the components from decay and to enhance the look of the project.

20×40 RV Carport Plans

This project can be built in less than one week and it will serve you for many, many years in a row. This large carport is easy to build and fairly budget friendly. I recommend you to read the local building codes before starting the project, so you make sure you comply with the local building codes. Check out PART 1 of the project to learn how to build the frame for the carport.

This woodworking project was about 20×40 RV carport gable roof 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.

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