20×24 Gable Shed Roof – Free DIY Plans

Ovidiu 0 GapDice RANDOM PLAN

This step by step diy woodworking project is about free 20×24 gable shed roof plans. This is PART 2 of the large garden shed project, where I show you how to build the roof and the doors. The instructions are basic, so you won’t have problems if you follow them step by step. Read the local building codes and consider buying engineered trusses. Make sure you take a look over the rest of plans to see alternatives and more projects for your garden.

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




20×24 Gable Shed Roof Plans




  • H – 21 pieces of 5/8″ T1-11 siding – 4’x8′ long, 1 piece – 13 3/4″x48″ long, 4 pieces – 21 3/4″x48″ long, 4 pieces – 39 3/4″x48″ long, 4 pieces – 48 3/4″x48 long WALL SHEETS
  • G – 1 piece of 2×4 lumber – 240″ long, 2 pieces – 144″ long, 2 pieces – 28 3/8″ long, 2 pieces – 57 5/8″ long 13xTRUSS
  • G – 4 pieces of 2×4 lumber – 144″ long TRUSS SUPPORTS
  • I – 28 pieces of 2×4 lumber – 156″ long PURLINS
  • J – 12 pieces of 1/2″ plywood – 48″x96″ long, 4 pieces – 24″x48″ long, 6 pieces – 47″x96″ long, 2 pieces – 24″x47″ long ROOF SHEETS
  • K – 650 sq ft of tar paper, 650 sq ft of asphalt shingles ROOFING
  • K – 4 pieces of 1×6 lumber – 145 1/2″ long, 4 pieces – 156″ long TRIMS
  • L – 2 pieces of 2×4 lumber – 80″ long, 1 piece – 43″ long JAMBS
  • M – 2 pieces of 2×4 lumber – 73″ long, 2 pieces – 36″ long, 1 piece – 29″ long DOOR
  • N – 2 pieces of 2×4 lumber – 80″ long, 1  piece – 103″ long JAMBS
  • O – 2 pieces of 2×4 lumber – 73″ long, 2 pieces – 48″ long, 1 piece – 41″ long 2xDOOR
  • P – 6 pieces 1×4 lumber – 43″ long, 6 pieces – 48″ long, 4 pieces – 96″ long, 4 pieces – 102 1/4″ long TRIMS

 One week



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How to build a 20×24 gable shed roof

Side wall panels - 20x24 shed

Side wall panels – 20×24 shed

Fit the 5/8″ T1-11 siding sheets to the sides of the gable. Align the edges flush and leave no gaps between the sheets. Use 6d nails to secure the sheets to the girts, every 8″.

Side wall with window - 20x24 shed

Side wall with window – 20×24 shed

Attach the siding sheets to the other side of the garden shed. As you can notice in the plans, you have to make cuts around the window and door openings. Make sure you cut the panels properly, because we’ll be using those when making the side door.


Assembling the 20 ft trusses



I recommend you buy engineered trusses, as they give you a good balance between costs and benefits. They will give you instructions on the span you need to leave between them and on the thickness of the truss carriers.

However, I will show you my take on building the trusses by yourself. Remember to read the local codes so you can make adjustments if needed. The first step is to build the rafters for the trusses. Use 2×4 lumber for the bottom rafters and 2x4s for the common rafters. Make a 20.5 degree cut to both ends of the rafters and lay them on a level surface.

Leave no gaps between the rafters. Set the miter saw at 69.5 degree before making the cuts to both ends of the bottom rafter.

W supports

W supports

In order to enhance the strength of the trusses, I recommend you to fit the W shaped supports. Use a saw to make the cuts to the supports, as shown in the diagram. Use 2x4s for the supports.



Attach the supports to the trusses and leave no gaps between the components. Fit the metal plates to the joints of the components, as shown in the diagram. Align the edges with attention and insert 1 1/2″ nails into the rafters.

Fitting the 20 ft trusses to the top of the shed

Fitting the 20 ft trusses to the top of the shed

Fit the trusses to the top of the shed, every 24″ on center. Plumb the trusses and then lock them to the carrier beams, using ties.

Supports for trusses

Supports for trusses

Fit the 2×4 supports to the bottom chords. These supports will enhance the rigidity of the roof structure. Use 3 1/2″ screws to secure the supports to the bottom chords. Drill pilot holes at both ends of the supports, to prevent the wood from splitting.

20x24 Shed - front wall

20×24 Shed – front wall

Fit the sheets to the front of the storage shed. Make the cuts so you can attach the sheets around the door opening. Make the cuts for the gable end panels. Leave no gaps between the sheets for a professional result.

Back wall panels - 20x24 shed

Back wall panels – 20×24 shed

Fit the sheets to the back of the shed, as well.

Roof purlins - 16x18 storage shed

Roof purlins – 16×18 storage shed

Fit 2×4 purlins to the gable roof of the large shed. Place the purlins every 24″ on center, starting from the bottom to the top of the roof. Make sure the overhangs are equal to the front and back.

Roof sheets - gable 20x24 shed

Roof sheets – gable 20×24 shed

Use 1/2″ plywood for the roof of the storage shed. Cut the plywood sheets as shown in the diagram and attach them to the top of the shed. Leave no gaps between the sheets and insert 1 5/8″ screws, every 8″ along the supports.

Front and back roof trims

Front and back roof trims

Use 1×6 lumber for the front and back roof trims. Secure them to the purlins with 3 1/2″ screws.

Side roof trims - 20x24 shed

Side roof trims – 20×24 shed

Fit the 1×6 trims to the sides of the roof. Use 6d nails to secure the trims to the trusses.

Fitting the roofing

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.


Building the shed doors

Fitting the jambs for the double doors

Fitting the jambs for the double doors

Use 2×4 lumber for the door jambs. Attach the jambs around the opening and align the edges flush. Insert 3 1/2″ screws to lock the jambs into place tightly.



Use 2×4 lumber for the door frame and T1-11 siding sheets for the door panels. Drill pocket holes and assemble the door frame on a level surface. Measure the diagonals and make sure they are even. Check if the corners are square. Attach the T1-11 siding sheets and insert 1 1/4″ nails to secure the panels into place tightly.

Front wall double doors

Front wall double doors

Fit the doors to the front of the shed. Align the edges flush and attach hinges to secure the doors to the jambs. Install a latch to lock doors.

Side door jambs

Side door jambs

Fit the 2×4 jambs around the side door opening.

Side door - 20x24 shed

Side door – 20×24 shed

Assemble the side door in the same manner described above.

Fitting the side door

Fitting the side door

Fit the door to the opening and use hinges to secure it to the jambs. Install a latch to lock the door into place.

Side window trims

Side window trims

Install 3’x4′ windows to the shed. Fit the 1×4 decorative trims around the windows.

Front wall trims

Front wall trims

Fit the window and the trims to the front of the shed.



Last but not least, you need to take care of the finishing touches. Apply a few coats of paint over the exterior of the shed, to protect the components from the elements and to enhance the look of the structure and make it match the design of your house.

Top Tip: Check out the rest of the shed projects for more inspiration for your backyard. Take a look over my other shed plans HERE.



This woodworking project was about 20×24 gable shed 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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