| How to Build a Shed Feb 9th 2013, 12:00 A shed solves a lot of storage needs for outdoor tools and equipment. It is also a great place for work projects that won't clutter up the garage. To build a basic shed, follow these instructions.
Note that the article includes exact plans for building a particular shed; however, you can modify them to custom-fit the shed to your own needs. - Level the ground (if necessary) and install deck piers along a grid to support the shed. The piers will allow you to string support beams beneath the floor of the shed. In the example design, the piers are spaced 6 feet apart in one direction and 4 feet apart in the other for a total grid area of 12 x 8 feet. This is convenient because once you lay supports along this grid, it will take exactly three standard 4- by 8-foot plywood sheets to cover it.
Top-down view of the foundation grid. - Note that in some countries, you must obtain a permit before doing any in-ground foundation work. If you would rather avoid this, you can build the shed on the ground by replacing the beams (see below) with 4x6-inch (102x152-mm) skids of pressure-treated lumber that is approved for ground contact, or by using precast concrete fence posts.
- String support beams lengthwise across the deck piers. This will support your floor joists, which run in the opposite direction. The easiest way to attach the beams to the piers is with metal straps, which have built-in nail holes. In the example design, the beams are 12-foot-long 4x6"s.
Top-down view of the support beams. - Attach joists to the support beams and separate them with blocking. First, you will need to attach a rim joist along the outer edge of each outermost support beam; each of these will need to be the same length as the beam underneath. Then, you will need to install a series of floor joists across the entire length of the support beams; these will need to be the same length as the distance between the two rim joints so that they'll fit between them. In the example design, the floor joists are all separated by 14.5-inch gaps except for the outermost two, which are 13 3/4 inches from their immediate neighbors; this is to allow a standard piece of plywood to line up with the outermost edge of the outermost joist but only cover half of an interior joist, allowing its neighbor to cover the other half so that both can be supported properly. To keep the floor joists from moving, install a piece of blocking between each pair of floor joists along the center support beam.
Top-down view of the rim and floor joists. Note the piece of blocking between the second and third floor joist. - Nail plywood sheeting to the joists to form the floor. If necessary, use H-clips in addition to nailing the sheets into place; these fit between two pieces of plywood and lock them together for additional structural strength. In the example design, two standard sheets of 4- by 8-foot plywood are used whole and a third is sawn in half and used to fill in the 4-foot difference on either end. Because of the spacing of the piers, support beams, and joists, no additional cuts or adjustments are necessary. Note that the pieces of plywood are intentionally misaligned so that the floor doesn't have a single seam running across the whole thing, which would be a significant structural weakness.
Top-down view of the plywood sheeting. - Flooring may also be screwed down with 3-inch deck screws
- Build the framework for all four walls. To account for the fact that the front and back walls are different from each other (due to the doorframe in the front) and the side walls must both be sloped (to prevent rain from collecting on the roof), each of these will have to be tackled somewhat differently. It's easiest to construct the back first, the front second, and the two sides last, as shown in the numbered image below. See How to Frame a Wall for more information before you read the instructions below.
Top-down view of the order in which to make the framework for each wall.
- Build the framework for the back wall. Make the top and bottom beams (a.k.a. the plates) the same length as the length of the floor which they sit. To keep your measurements simply, make the spacing between the vertical studs identical to the spacing between your floor joists. Note that the back wall should be lower than the front wall so that the roof slopes and directs rain away from the door.
Face-on view of the framework for the back wall.
- Build the framework for the front wall. The front wall should be the same as the back wall except taller and with a door frame so that you can hang a door in the shed when you're done.
Face-on view of the framework for the front wall.
- Build the framework for the side walls. The bottom plate of each side wall should be the same length as the distance between the bottom plates of the front and back wall (so that the side walls will fit between them). The standard spacing between vertical wall studs in the US is 16 inches (from center to center, not from edge to edge); since this stud spacing doesn't perfectly divide into the total length of the side walls in the example design, the two outermost studs make up for this discrepancy by being slightly closer to their neighbors. Most importantly, the top plate is angled so that the roof will be sloped, which makes the height of each vertical stud slightly different. If you're not sure how to calculate the necessary height of each vertical stud in advance, make the two outermost vertical studs first, lay them the correct distance apart, cut a top plate that spans this distance, and then cut each remaining vertical stud individually based on the distance between the top and bottom plates at that exact location.
Face-on view of the framework for the side walls, which are mirror images of one another (to accommodate for the slope of the roof). Note that the bottom plate is shortened so that the side walls can fit between the front and back walls. - Assemble the four wall structures. Wall structures are usually nailed to the underlying support from the bottom up. However, if this is not possible with the design you've chosen, simply nail them downwards through the plywood and joists or toenail them into place by driving the nails downwards and at an angle. Note that you will probably need other people to help you hold the wall structures up until they can be attached to one another.
- Build rafters across the roof and separate them with blocking. These should overhang the walls of your shed for increased weather protection. Again, your measurements will be greatly simplified if you space the rafters the same way that you spaced your floor joists. When you're done, attach pieces of blocking between each pair of rafters along the top plates.
Top-down view of the roof rafters. Note the blocking in yellow. - Nail plywood sheeting to the rafters to form the roof. If you have added overhang, the plywood layout you used to cover the floor will have to be amended.
Top-down view of the roof sheeting. - Cover the walls. You can use siding, textured plywood, or anything else that gives the shed a more finished look.
Face-on view of the front of the shed. - Add tarpaper to the roof. Start from the lower end of the roof slope and work your way upwards, making sure that each new level of paper overlaps the one below it to keep rain from seeping into the cracks. You can also use shingles or other roofing material if desired.
Top-down view of the tarpaper roofing.
- A ramp instead of stairs will allow you to move wheeled equipment in and out of the shed easily.
- You may want to install a corrugated fiberglass roof for natural light.
- Click on images to get the best view. Some information is lost in the thumbnail view.
- If you plan to finish the inside, you should add an additional stud in each corner for a nailing surface.
Edit Things You'll Need - Deck piers (see linked article in Step 1)
- 16d nails for the framing
- 8d nails for the sheeting
- 4- by 6-inch (10- by 15-cm) beams for support
- 2- by 6-inch (5- by 15-cm) beams for joists, rafters, and blocking
- 3/4-inch (2-cm) plywood for flooring
- 2- by 4-inch (5- by 10-cm) beams for studs and plates
- 4- by 4-inch (10- by 10-cm) beams for frame headers
- 1/2-inch (127-mm) plywood for roofing
- textured plywood (or siding) for the walls
- tarpaper for the roof
Edit Warnings - Don't nail your finger!
- Find out from your local building department if there are required setbacks from your property's boundry.
- Check the zoning in your location to see if a shed is allowed.
- Before you begin construction check local laws at your town's building department to see if a permit is needed.
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