This step by step diy project is about 16×20 gambrel shed plans. This is a large barn shed with 8′ tall walls. This shed features a double front door for easy access inside and two side windows, so you can have natural light inside. Make sure you check the local codes and make adjustments to the plans, if required. 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.
Projects made from these plans
16×20 Gambrel Shed Plans
Cut + Shopping Lists
- A – 5 pieces of 4×4 lumber – 240″ long SKIDS
- B – 2 pieces of 2×8 lumber – 240″ long, 16 pieces – 189″long FLOOR
- C – 8 pieces of 3/4″ plywood – 48″x96″ long, 4 pieces – 48″x48″ long FLOORING
- D – 2 pieces of 2×4 lumber – 55″ long, 1 piece – 192″ long, 1 piece – 185″ long, 10 pieces – 91 1/2″ long, 2 pieces – 78 1/2″ long, 7 pieces – 9″ long, 2 pieces of 2×6 lumber – 75″ long FRONT WALL
- E – 2 pieces of 2×4 lumber – 185″ long, 1 piece – 192″ long, 13 pieces – 91 1/2″ long BACK WALL
- F – 4 pieces of 2×4 lumber – 120″ long, 20 pieces – 91 1/2″ long, 1 piece – 240″ long SIDE WALL
- G – 4 pieces of 2×4 lumber – 120″ long, 20 pieces – 91 1/2″ long, 8 pieces – 9″ long, 4 pieces – 30″ long, 8 pieces – 31 1/2″ long, 1 piece – 240″ long, 8 pieces of 2×6 lumber – 33″ long SIDE WALL
- H – 14 pieces of T1-11 siding – 48″x96″ long, 4 pieces – 48″x91 3/4″ long SIDING
- 3 pieces of 4×4 lumber – 20′
- 2 pieces of 2×8 lumber – 20′
- 16 pieces of 2×8 lumber – 16′
- 10 pieces of 3/4″ plywood – 4’x8′
- 5 pieces of 2×4 lumber – 16′
- 2 pieces of 2×4 lumber – 20′
- 8 pieces of 2×4 lumber – 10′
- 76 pieces of 2×4 lumber – 8′
- 6 pieces of 2×6 lumber – 8′
- rafter ties
- 1 5/8″ screws
- 2 1/2″ screws, 3 1/2″ screws
- 6d nails
- wood filler , wood glue, stain/paint
- PART 1: 16×20 Gambrel Shed Plans
- PART 2: 16×20 Gambrel Shed Roof Plans
- PART 3: 16×20 Shed Door Plans
- 10×12 Barn Shed Plans
- 12×16 Barn Shed Plans
Step 1: How to build a 16×20 gambrel shed floor
The first step of the project is to build the floor frame. Cut the components at the right dimensions and then lay them on a level surface. Use 2×8 lumber for the joists. Drill pilot holes through the rim joists and then insert 3 1/2″ screws into the perpendicular beams.
Place the joists every 16″ on center, as in the diagram. Check if the corners are right angled and make adjustments, if necessary. Measure the diagonals and make sure they are perfectly equal.
Also, fit 4×4 skids under the floor frame. Align the edges and use rafter ties to secure the skids to the frame of the floor. Select the right location for the shed and then remove the vegetation layer. Compact a thick layer of gravel and make sure the surface is level.
Next, use 3/4″ plywood for the floor sheets. Take accurate measurements and use a circular saw to make the cuts. Fit the pieces of 3/4″ plywood to the floor frame. Align the edges flush and insert 1 5/8″ screws, every 8″ along the framing.
Step 2: Building the wall frames
Build the 2 section frames for the plain side wall from 2×4 lumber. Cut the components from 2×4 lumber at the right dimensions. Drill pilot holes through the plates and insert 3 1/2″ screws into the studs. Make sure the corners are square and place the studs every 16″ on center. Place double studs at both ends of the wall frames, as shown in the diagram.
The next step of the project is to assemble the plain side wall, by joining the two section together tightly. Use 2 1/2″ screws to lock the adjacent walls together tightly. Fit the 2×4 plate to the top of the walls. Drill pilot holes and insert 2 1/2″ screws to secure the double plate into place tightly.
Continue the shed project by building the 2 section wall frames for the opposite side wall. As you can easily notice in the diagram, you need to frame a 30″x30″ window to the 2 section frames, so you let enough light inside the barn shed. Use 2×6 lumber for the headers. Sandwhich a piece of 1/2″ plywood between the two 2×6 pieces.
Next, assemble the side wall by joining the 2 wall frames together. Attach the double plate to the top of the 2 section frames. Insert 2 1/2″ screws to assemble the side wall together tightly.
Build the back wall for the shed using the same techniques described above and the information from the diagram.
Build the front wall, making sure you frame the double doors.
Step 3: Fitting the shed wall frames
Fit the wall frames to the floor of the shed. Align the edges with attention and plumb the walls with a spirit level. Drill pilot holes through the bottom plates and insert 3 1/2″ screws into the floor. Lock the adjacent walls together tightly using 3 1/2″ screws. Use temporary braces for the side walls, as the front, till you install the front wall.
Step 4: Fitting the wall siding panels
Fit the T1-11 siding sheets to the side wall of the 16×20 barn shed. As you can easily notice in the diagram, you need to cut out the holes for the window opening. Align the sheets to the top edge of the double plates and leave no gaps between them. Insert 6d nails to secure the sheets to the framing, every 8″.
Next, fit the sheets to the opposite side of the shed, using the same techniques described in the diagram.
Also, fit the sheets to the front of the large gambrel shed. Cut the sheets to the cut out the door opening. Leave 1 1/2″ from the top edge of the wall frame. Insert 6d nails to secure the sheets into place.
In addition, fit the siding sheets to the back of the gambrel shed, as well. Use the same techniques described above.
You should check out PART 2 of the project, so you learn how to build the gambrel shed roof. Check out PART 3 of the project so you learn how to build the double doors and how to fit the decorative trims.
Last but not least, I have lots of other shed projects on the site so I recommend you to browse through all alternatives before starting the building project. See all my shed projects HERE.
This woodworking project was about 16×20 gambrel shed 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.