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12×12 Gambrel Shed Roof Plans

by Ovidiu
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This step by step diy project is about 12×12 gambrel shed roof plans. This is PART 2 of the short barn shed project, where I show you how to build the gambrel roof for the 12×12 shed. This shed features a small loft, so you can add even more storage space. Take a look over the rest of my woodworking plans, if you want to get more building inspiration. Remember that you need to select the site for the shed with attention and that you have to comply with a few legal regulations.

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




12×12 Gambrel Shed Roof Plans




Cut & Shopping Lists

  • G – 28 pieces of 2×4 lumber – 55″ long RAFTERS
  • H – 3 pieces of 2×6 lumber – 144″ long JOISTS
  • I – 2 pieces of 3/4″ plywood – 46 3/4″x48 long, 1 piece – 41″x46 3/4″ long LOFT
  • J – 4 pieces of 2×4 lumber – 45 1/2″ long, 4 pieces – 55 1/2″ long, 2 piece – 64 1/2″ long, 2 pieces – 136 1/4″ long SUPPORTS
  • K – 2 pieces of 5/8″ siding – 48″x62″ long,2 pieces – 48″x71 3/4″ long  GAMBREL ENDS
  • M – 6 pieces of 3/4″ plywood – 48″x55″ long, 6 pieces – 41″x48″ long, 6 pieces – 14″x48″ long ROOF


 Hammer, Tape measure, Framing square, Level

 Miter saw, Drill machinery, Screwdriver, Sander

 Safety Gloves, Safety Glasses


 One day




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How to build a 12×12 gambrel shed roof



The first step of the project is to attach the loft joists to the shed structure. Clamp the 12′ long 2×6 joists to the studs. Drill pilot holes through the joists and insert 2 1/2″ screws to lock them into place tightly.



Cut the 3/4″ plywood sheets at the dimensions described in the image. Attach the sheets to the loft joists and insert 1 5/8″ screws to secure them into place tightly.



Build the rafters for the gambrel shed from 2×4 lumber. Make 22.5 degree cuts to both ends of the rafters. In this manner, both ends of the rafters will have 67.5 degrees.



Lay the rafters on a level surface, so you can assemble the trusses. As you can easily notice in the diagram, you should use 1/2″ plywood for the gussets that go over the joints.



Fit the trusses to the top of the shed frame. Use a spirit level to plumb the trusses and place them every 24″ on center. Drill pilot holes through the rafters and insert 2 1/2″ screws into the top plates.



Fit a 2×4 support to the bottom of the trusses. Drill pocket holes at both ends of the supports and lock them into place with 2 1/2″ screws.



Fit the vertical supports to the front and back of the gambrel shed. Drill pocket holes at both ends of the supports and lock them into place with 2 1/2″ screws.


Fitting the gambrel end panels

Cut the pieces for the gambrel ends from 5/8″ T1-11 siding. Attach the panels into place and lock them to the supports with 8d nails.


Fitting the roofing sheets

Attach the 3/4″ plywood sheets to the top of the shed, as show in the plans. Leave no gaps between the sheets and insert 1 5/8″ screws every 8″ to secure the sheets into place tightly.


12×12 gambrel shed plans free

This is a complex shed project, so you should take your time when building the structure. Don’t forget to take a look over PART 1 and PART 3 to learn how to build the frame and the doors for the shed.



This woodworking project was about barn shed 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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