This step by step diy project is about 12×20 gambrel shed roof plans. This is PART 2 of the shed project where I show you how to build the barn style roof for the small cabin or for the storage shed. This article includes building the barn roof, framing the loft and making the doors. 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.
Projects made from these plans
12×20 Gambrel Roof with Loft – DIY Plans
- J – 3 pieces of T1-11 siding – 48″x62 1/2″ long, 1 piece – 48″x66″ long, 2 pieces – 48″x72 1/2″ long SIDING SHEETS
- K – 2 pieces of 2×4 lumber – 55 1/2″ long 16xTRUSS
- M – 2 pieces of 2×4 lumber – 55 1/2″ long, 16 pieces – 4 1/4″ long, 2 pieces of 2×6 lumber – 128 3/4″ long 2xOVERHANGS
- N – 4 pieces of 2×4 lumber – 49 1/2″ long, 4 pieces – 59 1/2″ long, 2 pieces – 68 3/4″ long GAMBREL END SUPPORTS
- O – 8 pieces of 1/2″ plywood – 8″x55 1/2″ long, 8 pieces – 48″x96″ long, 4 pieces – 48″x48″ long, 8 pieces – 7 1/2″x96″ long, 4 pieces – 7 1/2″x48″ long ROOF
- P – 500 sq ft of tar paper, 50 sq ft of asphalt shingles ROOFING
- R – 11 pieces of 2×6 lumber – 12′ long, 1 piece – 51 1/2″ long LOFT JOISTS
- S – 2 pieces of 3/4″ plywood – 48″x96″ long, 2 pieces – 48″x48″ long, 1 piece – 36 1/4″x48″ long, 1 piece – 36 1/4″x96″ long LOFT FLOOR
- T – 8 pieces of 1×6 lumber – 56″ long, 7 pieces of 1×4 lumber – 96″ long TRIMS
- U – 4 pieces of 2×4 lumber – 80″ long, 1 piece – 79″ long, 1 piece – 39″ long DOOR JAMBS
- U – 2 pieces of 2×4 lumber – 73″ long, 2 pieces – 36″ long, 1 piece – 29″ long, 1 piece of T1-11 siding – 36″x80″ long 2xDOOR
- U – 2 pieces of 2×4 lumber – 73″ long, 2 pieces – 32″ long, 1 piece – 25″ long, 1 piece of T1-11 siding – 32″x80″ long DOOR
- W – 3 pieces of 2×4 lumber – 40 1/2″ long, 7 pieces of 2×2 lumber – 30 1/2″ long 3xRAILINGS
- 10 pieces of T1-11 siding – 4’x8′
- 46 pieces of 2×4 lumber – 10′
- 15 pieces of 2×6 lumber – 12′
- 19 pieces of 3/4″ plywood – 4’x8′
- 21 pieces of 2×4 lumber – 8′
- 7 pieces of 2×2 lumber – 8′
- 4 pieces of 1×6 lumber – 10′
- 7 pieces of 1×4 lumber – 8′
- 500 sq ft of tar paper, 50 sq ft of asphalt shingles
- 2 1/2″ screws, 3 1/2″ screws, 1 5/8″ screws
- 6d nails
- wood filler , wood glue, stain/paint
- 550 sq ft of tar paper, 250 sq ft of asphalt shingles
- 3 shed windows 24″x36″
- 1 exterior door 32″x80″
- rafter ties
- shed hinges
- PART 1: 12×20 Small Cabin with Side Porch Plans
- PART 2: 12×20 Gambrel Cabin Roof Plans
Building a gambrel roof with loft for a 12×20 cabin
Build the rafters for the gambrel roof. Make 22.5 degree cuts to both ends of the 2×4 rafters and then lay them on a level surface.
Use 1/2″ plywood for the gussets. Mark the cut lines on the plywood sheets and then get the job done with a circular saw. Smooth the edges with sandpaper for a professional result. Fit the gussets over the joints and secure them into place with 1 5/8″ screws.
Fit the trusses to the top of the 12×20 shed. Plumb the trusses with a spirit level and then place them equally spaced, every 16″ on center. Use rafter ties to secure the trusses to the top plates.
Fit the 2×6 joists for the loft to the top of the wall frames. align the edges at both ends and secure them to the trusses with 2 1/2″ screws.
Use 2×6 lumber for the loft frame. Use a saw to make the angle cuts at both ends of the beams.
Use 3/4″ plywood sheets for the loft floor. Cut the sheets as shown in the diagram and lay them to the loft frame. Leave no gaps between the sheets. Drill pilot holes and insert 1 5/8″ screws, every 8″ along the framing.
Fit 2×4 lumber to the ends of the small tiny house roof. Drill pocket holes at both ends of the supports and insert 2 1/2″ screws to lock them into place tight.
Use 5/8″ T1-11 siding sheets for the gambrel end panels. Use a saw to make the angle cuts to the siding sheets. Use 6d nails to lock the panels to the framing.
Use a 2×4 lumber for the rails and 2×2 lumber for the balusters. Drill pilot holes through the balusters and insert 2 1/2″ screws into the rails. Place the balusters every 3 3/4″, as shown in the diagram.
Last but not least, attach the 2×4 handrail to the top of the railings. Align the edges drill pilot holes and insert 2 1/2″ screws to assemble everything together tightly.
Drill pocket holes at both ends of the rails and insert 2 1/2″ screws to lock them to the posts of the front porch. Leave about 4″ clearance from the decking to the rails.
Use T1-11 siding sheets to cover the top plates for the porch.
Next, you need to assemble the overhangs for the gambrel roof. Use the rafters and add blockings, as shown in the diagram. Drill pilot holes through the rafters and insert 2 1/2″ screws into the blockings. Moreover, you can adjust the size of the overhangs to suit your needs.
Fit the overhangs to the front and to the back of the cabin. Align the edges flush, drill pilot holes and insert 3 1/2″ screws, every 8″ along the framing.
Use 1/2″ plywood sheets for the roof of the barn shed with porch. Cut the sheets as shown in the diagram and then lay them to the roof of the cabin. Leave no gaps between the sheets, drill pilot holes and insert 1 5/8″ screws, every 8″ along the roof structure.
Use a table saw to make the 45 degree cuts to the 2×6 side overhangs.
Fit the overhangs to the sides of the gambrel shed and align the edges with attention. Drill pilot holes and insert 3 1/2″ screws to lock the slats into place tightly.
Fit the 1×6 trims to the front and back of the roof. Make the angle cuts to the trims, using a miter saw. Insert 6d nails to secure the trims into place tightly.
Cover the roof of the shed with roofing felt, making sure the strips overlap at least 2″. Secure the tar paper to the plywood sheets with roofing staples. In addition, cut a large piece for the top ridge.
Fit the 2×4 jambs around the double door opening. Align the edges flush, drill pilot holes and insert 3 1/2″ screws to lock them into place tightly.
Use T1-11 siding for the door panel. Assemble the door frame from 2×4 lumber. Drill pocket holes and insert 2 1/2″ screws to assemble the door frame. Attach the panel to the door frame and insert 2″ nails to lock them together tightly.
Fit the double doors to the opening and use hinges to secure them to the jambs. Install a latch to keep the doors locked.
Fit T1-11 siding sheets or 1/2″ plywood to the porch ceiling. Insert 2 1/2″ screws to lock the sheets into place.
Build the side door, using the same techniques described above.
Fit the door jambs around the front door opening. Align the edges flush, drill pilot holes and insert 2 1/2″ screws to lock the jambs into place tightly.
Fit the door to the opening, align the edges and lock it to the jambs with hinges. Install a latch so you can lock the door. Alternatively, you can install a pre-hung door.
Fit the windows to the openings and then install the trims around them.
Last but not least, you need to take care of the finishing touches. Apply a few coats of paint to enhance the look of the cabin. You can also add insulation between the walls, if you plan to use the cabin during the winter. Don’t forget to take a look over PART 1 to learn how to build the frame of the tiny house.
This woodworking project was about 12×20 gambrel 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.