12×20 Gambrel Shed Roof Plans

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. See all my Premium Plans HERE.

Projects made from these plans

12×20 Gambrel Roof with Loft – DIY Plans

Building-a-12×20-barn-shed-with-porch

Cut & Shopping Lists

• 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

Tools

 Hammer, Tape measure, Framing square, Level

 Miter saw, Drill machinery, Screwdriver, Sander

 Safety Gloves, Safety Glasses

Time

 One day

Related

• 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

Making-the-rafters-for-the-12×20-barn-shed

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.

Fitting the gussets – trusses for barn shed

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.

Fitting-the-trusses-to-the-barn-shed-with-loft

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.

Loft joists

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.

Ceiling joists – 12×20 barn shed with side porch

Use 2×6 lumber for the loft frame. Use a saw to make the angle cuts at both ends of the beams.

Fitting the sheets to the loft

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.

Gambrel end supports

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.

Gambrel end Panels

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.

Rails-shed-porch

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.

Handrails – shed porch

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.

Fitting the railings – shed with porch

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.

Porch siding sheets

Use T1-11 siding sheets to cover the top plates for the porch.

Assembling the overhangs

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.

Fitting the overhang

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.

Fitting-the-roofing-sheets-for-the-12×20-barn-shed

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.

Side overhangs

Use a table saw to make the 45 degree cuts to the 2×6 side overhangs.

Fitting the 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.

Front and Back roof trims

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.

Fitting the roofing to the shed

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.

Fitting the jambs for the double doors

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.

Double doors for shed

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.

Fitting the double doors

Fit the double doors to the opening and use hinges to secure them to the jambs. Install a latch to keep the doors locked.

Ceiling for porch

Fit T1-11 siding sheets or 1/2″ plywood to the porch ceiling. Insert 2 1/2″ screws to lock the sheets into place.

Side-door

Build the side door, using the same techniques described above.

Side door jambs

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.

Fitting the side door

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.

12×20 Barn Shed with Porch Plans

Fit the windows to the openings and then install the trims around them.

12×20-barn-shed-with-porch-plans

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.

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