Build a Backyard Corn Crib

The perfect storehouse for corn cobs and grain bags.

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    Trusses are assembled using an A-shaped marked on ply floor.
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    An easy-to-build corn crib that won't cost a bundle.
  • 174-060-01
    Expanded construction diagram.

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Here is a scaled-down version of an old-time, hopper-shaped, slat-sided whole-corn crib that you can build inexpensively.  



1. Locate an area that is level, sunny, open to wind flow, handy to fields or garden and house and within the mowed area of the homeplace.

2. Lay out a 4' x 8' rectangle of sod, with long side facing prevailing wind.

3. Dig out sod and loose topsoil inside rectangle. With stakes, line level and plumb bob, dig soil surface at corners and at midpoint of long sides so hole bottoms are all on the same level plane.

4. Set concrete blocks at corners and midpoint of long dimension. Stack blocks two high if needed to rise at least 4" above ground level (use mortar if three blocks high).


1. Locate 2" x 6" x 8" PTs (standing on edge) along both long sides of plywood floor. Fasten (through ply) to underside of floor with 3" nails or deck screws.

2. Cut remaining 2" x 6" x 8' into two approx. 3'-9" boards to fit on edge snugly between ends of long side boards. Fasten to underside of ply. Join board ends together at corners with nails and with right-angled metal corner ties located inside of joints.

3. As anti-rodent shield, cement (with roofing cement) sheet aluminum flashing on top of blocks so that it extends 3" beyond all edges. Leave loose and floppy so corn-hungry critters can't get a foothold.

4. Set platform on blocks. Shim level and firm to eliminate wobble.


1. From center point at one end of platform floor, mark rafter pattern to make A-shaped roof trusses. Mark each rafter to describe a 30° angle from the horizontal end of platform.

2. Cut the five 2 x 4 x 12' boards at a 60° angle across the midpoint of the board to make ten 6'-long rafters.

3. Lay out pairs of rafters at 30° in an A shape, with 60° angle end cuts facing at the center mark on floor edge. Set angle-cut faces 2 apart to make a notch to accept a 2 x 4 horizontal ridge board.

4. Cut a pair of 2 x 4 horizontal cross braces to fit across and connect each set of angled rafters: one to fit across rafters 4 down from peak to make a bottom for the 2 x 4 top notch; a second (the roof joist) to connect rafters where they reach the 4' span that is the width of the crib-the bottom edge of the joist placed where the rafters' lower edges intersect the long sides of the ply floor.

5. Trim ends of cross braces to match angle of rafters and fasten to rafters


1. Prefab two 8' x 8'-3" high crib side-wall frames from stock 2 x 4 x 8's, doubling boards on ends and arraying vertical studs 24" on center that is, three single vertical 2 x 4 x 8's fastened between top (header) board and bottom (footer), and spaced 2', 4' and 6' from ends.

2. Raise side-wall frames to the vertical; angle-brace with scrap lumber. Assure wall is vertical and fasten footer (bottom horizontal board) to floor every 6".

3. Connect top of side-wall frames across ends of crib with 2 x 4 x 4' crossbeams. Fasten approx.
3'-9" boards to floor between side walls at each end.

4. On the door end, fasten a second 4' crossbeam 1' down from top, then cut to size and fasten a pair of vertical 2 x 4 door frames 36" apart between lower crossbeam and floor.

5. At the other (closed) end, fasten horizontal 4' crossbeams at top and 1',3' and 5' down.

6. Tack a temporary brace or two across tops of side walls and remove angle braces.

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