How to Build a Wood Shed Off Garage

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When you need a little extra storage space for your collection of stuff, and you don't want to go to the expense of renting a self-storage unit, building a wood shed in your yard is a great alternative. If you can build it off of your garage as a sort of lean to unit, another advantage is that the back wall is not exposed to as much of the elements as the rest of the shed will be. A shed built off of another structure is often called a "Lean-To" shed.

Things You'll Need

  • 8 solid concrete blocks
  • 4 cinder-blocks
  • 4 4 foot by 4 inch posts
  • Rubber Mallet
  • Four Foot Level
  • Flat brackets
  • Screws
  • 6 2 by 4s
  • ¾ inch plywood measured to fit floor frame
  • Framing nail gun
  • 5 2 by 8s
  • Corner brackets
  • 6 2 by 6s
  • Pre-hung door frame
  • Panels of ½ inch CDX plywood for back wall
  • Circular saw
  • ¾ inch CDX plywood to fit over roof rafters.
  • 15 lb. Felt
  • Staple gun
  • Asphalt shingles
  • Choose the location of the lean to shed. The area should be level and free of obstructions. Clear the area thoroughly if the obstructions can be removed.

  • Lay two solid concrete blocks on each corner of the area for the shed. Set a cinder block at each corner on top of the concrete blocks. Lay one of the pressure treated four foot by four inch post on top of the cinder blocks. Use a four-foot level to make sure the blocks are sitting level. If they aren't, use a rubber mallet to make adjustments. Use the remaining posts to create a square frame on top of the cinder blocks. Secure each corner of the frame posts with flat brackets.

  • Frame the floor using 2 by 4s placed every 18 inches. Use a framing nail gun, secure the 2 by 4s to the 4 by 4 wood posts. Set the 3/4 inch plywood down on top of the floor frame and use the framing nail gun to secure it to the 2 by 4s.

  • Frame the walls on the back of the structure against the garage. Secure a 2 by 8 to the back corner of the shed using a corner bracket and carpenter screws. Measure off two feet from the back corner and secure another 2 by 8 using a corner bracket and carpenter screws to the back wall area. Repeat this procedure in the second back corner and secure two more 2 by 8s.

  • Frame the walls of the front of the structure. Set a 2 by 6 plank upright in the front corner of the shed and use a corner bracket and screws. Repeat for the second front corner of the shed. These should line up with the 2 by 8s in the back portion of the shed. Secure a 2 by 6 in the center of the left and right side wall frame with a framing nail gun.

  • Install the door frame into the front of the shed. Place the door frame in the center of the front portion of the wall and use 2 by 4s cut to the specific size of the door you chose to frame it in. Using a pre-hung door already in a frame will greatly reduce the amount of time spent on this chore.

  • Attach panels of 1/2 inch CDX plywood to the outside rear of the structure to serve as the back wall. Secure the panels into place using the framing gun.

  • Frame the roofing. Nail a 2 by 8 to fit over the front frame on the top of the four 2 by 6's you installed earlier. Use a corner bracket on one corner of each 2 by 6's. Use the four foot level to make sure the 2 by 8 is level. Cut and fit another 2 by 6 to the top part of the frames on each side wall. The side wall frames should both now resemble a large rectangle turned up on it's narrow end.

  • Cut one corner of each of the four 2 by 4s that are going to serve as the rafters. The cut should be at a 45 degree angle. Secure the first rafter with the cut end facing the front of the structure to the back wall with a framing gun. Use a straight bracket and screws to secure the cut side, with cut side down, to the front corner. Repeat this procedure with three more 2 by 4s.

  • Cut the remaining 1/2 inch CDX plywood to fit over the rafters and use framing gun to secure it. Cut and staple a sheet of 15 pound felt over the plywood. Staple or nail asphalt roof shingles to the roof to complete the project.

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