Age Range: 6 to 12 years
I loved to play in my mother’s flower garden with my cars making roads and tunnels. Kids are fascinated with digging and playing in dirt. A sandbox is a perfect alternative to the backyard mud pit. Self-contained, free of debris, and easy to dig up with the most plastic of toys, a sandbox can keep kids occupied for hours. Here is a fun family project that can be done together and can be accomplished in an afternoon. In fact, it’s so simple it’s practically child’s play—and we can dig that.
This sandbox is a basic rectangle of 4×4 timbers stacked three high and set just below grade into the ground. The timbers sit end-to-side at the corners, and the arrangement is alternated at each corner to create a lapped pattern—a stronger seam for the large pieces. The three layers tie together with long, self-tapping timber screws.
The box has a lining of landscape fabric—cleverly held in place between the second and third course of timbers—which keeps weeds from growing up through the sand from the ground. The sand itself is play sand or natural sand, an extremely fine sand that has been sifted to be free of large or jagged particles.
1. Cut the timbers
Cut the timbers that make up the walls of the sandbox. They will butt end-to-side at the corners. So to determine how long the timbers have to be, subtract 3½ inches (the true width of a 4×4) from the length you want each side to be. Using a circular saw, cut the timbers to these dimensions. You will need 3 pieces for each side of the box.
2. Lay out the sandbox
Arrange four timbers in an outline of the sandbox, butting each timber’s end against the next timber’s side. Using a spade or square-edged shovel, mark the sandbox’s outline by cutting vertically through the turf both inside and outside the loose-laid timbers’ perimeter.
3. Dig out the center of the box
Using a spade, dig down 6 inches within the outline of the sandbox. Then add a 4-inch-wide and 1-inch-deep layer of sand inside the perimeter of the hole. If the area you’ve chosen for your sandbox is not level, dig a flat-bottomed hole.
4. Lay the base course
Position the first course of timbers on top of the sand. Push a framing square into each corner and adjust the timbers until they are perfectly square. Hold each corner in this square position by bracing it with a scrap piece of 2×4 screwed down with 3-inch decking screws. Using a sledge and a 4-foot level, gently tap each timber down into the sand until it is level.
5. Position the second course
Remove the 2×4 braces at the corners. Lay the next course of timbers on top of the base course, but arrange them so they overlap at the corners in the opposite direction from the first course. This will create a lapped pattern.
6. Tie the courses together
Using a drill/driver fitted with a nut-driver bit, drive 6-inch timber screws down through the top course and into the timber beneath every 3 feet around the perimeter.
7. Line the box with landscape fabric
Lay landscape fabric along the inside of the box, allowing it to cover the bottom and overlap the second course of timbers. Make sure to push the fabric against all of the edges and into the corners.
8. Lay the third timber course
Lay the third course of timbers on top of the second, overlapping the corners again. Fasten them to the second course with timber screws (as before). Trim the excess fabric hanging over the outside of the box.
9. Fill the box with sand
Fill the interior with natural sand and dig-in! To prevent rain and animals from getting into the box, cover it with a tarp held down with Velcro tape.
Supplies You Will Need
1. 4×4 CEDAR TIMBERS to make up the sides of the sandbox
2. SCRAP 2×4 to hold the timbers square while you fasten them down
3. 3-INCH DECKING SCREWS
4. 6-INCH SELF-TAPPING TIMBER SCREWS
5. LANDSCAPE FABRIC to line the box and keep weeds from growing up through the sand
6. PLAY SAND
8. VELCRO TAPE to hold the tarp down