12×20 Gambrel Roof Plans

This step by step diy project is about 12×20 gambrel roof plans. This is PART 2 of the shed project where I show you how to build the barn style roof for the storage shed.  This barn shed has double doors to the front, a side door and a window. This shed has overhangs to the front, back and on the sides, so you protect the walls from water damage. 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.

 

 

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12×20 Gambrel Shed Roof Plans

Building a 12x20 gambrel shed

Building a 12×20 gambrel shed

 

Cut + Shopping Lists

Tools

 Hammer, Tape measure, Framing square, Level

 Miter saw, Drill machinery, Screwdriver, Sander

 Safety Gloves, Safety Glasses

Time

One week

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How to build a 12×20 gambrel shed roof

Rafters

 

Birdsmouth-cuts-for-rafters

Birdsmouth-cuts-for-rafters

The first step of the shed roof project is to build the rafters for the trusses. In order to get a professional result, you need to use a miter saw and to make 22.5 degree cuts to both ends of the 2×6 beams. As you can notice in the diagram, you also need to make birdsmouth cuts to the rafters that go on the top of the side walls (the base rafters). Take accurate measurements before making the cuts.

Gussets

Gussets

Lay the rafters on a level surface. You can make a simple jog so you speed up the process. Use 1/2″ plywood for the gussets and follow the instructions in the diagram for a professional result. Align the edges flush and insert 1 5/8″ screws to secure the trusses together tightly. Ideally, you need to add the gussets on both sides.

 

Fitting the trusses

Fitting-the-trusses

Fitting-the-trusses

Fit the trusses to the top of the shed frame, placing them every 16″ on center. Plumb the trusses with a spirit level and then secure them into place with rafter ties. Insert 1 1/2″ structural screws to lock the ties into place.

Gambrel-end-supports

Gambrel-end-supports

Use 2×4 lumber for the gambrel end supports. Make cuts to the top of the supports and then drill pocket holes at both ends. Fit them into place and then secure them into place with 2 1/2″ screws.

Gambrel-end-panels

Gambrel-end-panels

Cut the T1-11 siding panel at the size and shape highlighted in the diagram and then secure them into place with 6-8d nails. Insert the nails every 8″ along the framing.

 

Fitting the overhangs

Assembling-the-overhangs

Assembling-the-overhangs

Build the overhangs for the front and the back of the shed from 2×6 lumber. Drill pilot holes through the rafters and insert 3 1/2″ screws into the blockings. You can adjust the size of the blockings to suit your needs.

Fitting-the-overhangs

Fitting-the-overhangs

Fit the overhangs to the front and to the back of the shed. Align the edges flush. Drill pilot holes through the overhangs and insert 3 1/2″ screws to lock them into place tightly.

Roof-sheets

Roof-sheets

Cut and fit the 1/2″ plywood sheets to the roof of the gambrel shed. Align the edges with attention and insert 1 5/8″ screws every 8″ along the rafters, so you can lock them into place tightly. Leave no gaps between the sheets for a professional result.

 

Fitting the roof trims

Gambrel-trims

Gambrel-trims

Fit the 1×6 decorative trims to the front and to the back of the gambrel shed. Make the angle cuts and then secure them into place with 2″ nails.

Fitting-the-roofing

Fitting-the-roofing

Cover the roof with tar paper and then install the asphalt shingles. Make sure you also install the appropriate drip edges, so you can seal the shed roof. Read the manufacturer’s instructions for a tight fit.

Door-jambs---double-doors

Door-jambs—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.

Large-door-frame

Large-door-frame

Next, we need to assemble the door frames. Cut all components from 2×4 lumber and drill pocket holes at both ends of the vertical and middle components. Lay them flat on a level surface and align everything with attention. Insert 2 1/2″ screws to assemble the door frame.

Large-door-panel

Large-door-panel

Attach the panel to the door frame. Align the edges flush and insert 1 5/8″ screws to assemble the shed door.

Fitting-the-double-doors

Fitting-the-double-doors

Fit the double doors to the opening and align them with attention. Use hinges to lock the door to the jambs. Install a latch to secure the shed.

Side-door-jambs

Side-door-jambs

Attach the door jambs to the side of the shed.

Side door frame

Side door frame

Assemble the door frame using the same techniques described above.

Attaching-the-door-panel

Attaching-the-door-panel

Attach the panel to the door frame.

Fitting-the-side-door

Fitting-the-side-door

Fit the door to the side wall and secure it to the jambs with hinges. Also, install a latch.

Fitting-the-window

Fitting-the-window

Fit the window to the side opening. Install the 1×4 trims around the window to enhance the look of the shed. Install 2″ nails to lock the trims into place.

Corner trims

Corner trims

Fit the 1×4 trims around the shed corners. Use 2″ finish nails to lock the trims into place tightly.

12x20 Shed gambrel Plans dimensions

12×20 Shed gambrel Plans dimensions

 

12x20 Shed gambrel Plans

12×20 Shed gambrel Plans

Fill the holes with wood putty and smooth the surface with 120-220 grit sandpaper. Apply a few coats of paint to enhance the look of the shed and to protect the components from decay. If you are here, I recommend you to take a look over the rest of the shed plans, as well, HERE.

 


Get PDF Plans

 

This woodworking project was about 12×20 gambrel 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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