What's inside
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This slatted outdoor coffee table has a simple rectangular frame, a slatted top and a lower shelf for cushions, books or a serving tray. The shelf is open rather than boxed in, so rain can drain through it. The plan suits a beginner who can make straight cuts and drive screws; accurate, square assembly matters more than advanced joinery.
The finished table is about 42 inches long, 22 inches wide and 18 inches high. Adjust the dimensions to fit your seating, but keep the lower shelf roughly 5 inches above the ground so it is easier to sweep beneath and less exposed to standing water.
Contents
Materials and tools
Use naturally durable wood such as cedar, or pressure-treated lumber rated for above-ground use. Cedar is lighter and easier to work, but costs more and dents readily. Pressure-treated boards are usually cheaper; let wet lumber dry before finishing, and wear a dust mask when cutting it. Avoid untreated pine if the table will stay outside: it is inexpensive, but the legs and shelf can decay quickly when they remain damp.
- Four 2×2 legs, cut to 17 inches
- Two 1×4 long aprons, cut to 38 inches
- Two 1×4 end aprons, cut to 18 inches
- Three 1×3 shelf supports, cut to 18 inches
- Seven 1×3 top slats, cut to 42 inches
- Seven 1×3 shelf slats, cut to 42 inches
- Exterior-rated screws: 2½-inch for frame joints and 1⅝-inch for slats
- Exterior wood finish, sandpaper and exterior-rated wood glue (optional)
These cuts use nominal lumber sizes; actual board dimensions are smaller. The 38-inch aprons fit between the legs, producing a frame about 41 inches long once the legs are included. The 18-inch end aprons fit between the legs across the width. Check your actual lumber and dry-fit the frame before cutting the slats; a small change in apron length affects the finished width.
A miter saw makes repeat cuts convenient, but a circular saw and a square-cut guide work. A box of exterior-rated deck screws is worth buying; interior screws can rust or fail outdoors. For the finish, a penetrating exterior oil is easy to renew, while an exterior film finish offers more surface protection but can peel if water gets underneath it.
Choose wood for your conditions
| Material | Best fit | Trade-off |
|---|---|---|
| Cedar | Lighter table and straightforward cutting | Higher cost; soft edges can dent |
| Pressure-treated lumber | Lower-cost table with outdoor exposure | Often wet or bowed at the store; let it dry before finishing |
| Untreated pine | Covered porch or short-term project | Lowest initial cost, but poor choice for frequent rain and ground moisture |
Cut and prepare the parts
Choose straight boards with no large knots near the ends or screw locations. Reject badly twisted legs; a frame cannot reliably pull them straight without adding stress. Cut the parts to length and label them. Sand the slats and any edges you can reach after assembly with 120-grit paper, then break sharp corners with a light pass. Outdoor furniture is more comfortable when edges are eased, and finish covers a rounded edge better than a sharp one.
For a more polished top, a random-orbit sander speeds up smoothing. It is not essential: sanding by hand is fine for this small project, particularly if you accept a slightly less uniform finish.
Assemble the upper frame
Place two legs on a flat surface and position one long apron between them, with the apron’s top edge about 1 inch below the top of the legs. That setback leaves room for the slats to sit on the frame without making the tabletop too high. Drill pilot holes through the apron into each leg, then drive two 2½-inch screws into each joint. Repeat with the opposite long apron and both end aprons.
Measure diagonally from corner to corner in both directions. If the measurements differ, push the longer diagonal inward until the frame is square, then tighten the joints. A twisted or out-of-square frame makes the slat gaps uneven and can leave one leg wobbling. Check squareness again after adding the shelf supports.
Install the lower shelf
Mark the inside faces of the legs 5 inches above the bottoms. Fit one 18-inch support across each short end at those marks, then add the third support midway between them. Keep their top edges level so the shelf slats do not rock. Predrill and fasten each support into the legs with two 2½-inch screws per end.
Lay the seven shelf slats across the supports, running them along the length of the table. Leave an even gap of about ⅜ inch between slats. Use a scrap offcut as a spacer rather than measuring every gap individually. Fasten each slat to each support with one 1⅝-inch screw. Predrill near the ends, especially in cedar, to reduce splitting.
Attach the tabletop slats
Set the seven top slats across the frame, parallel to the shelf slats. Center the first and last slats over the aprons and use the same ⅜-inch spacers between boards. The slats should overhang the frame by about ½ inch at each end and side. Adjust the gap slightly if needed to keep the overhang even; consistent spacing matters more than hitting an exact number.
Secure each slat to both long aprons with a 1⅝-inch screw. Drill pilot holes and keep screws at least ¾ inch from board ends. Do not overtighten: driving a screw head deeply into soft wood can crush the surface and trap water around the hole.
Finish and maintain the table
Sand exposed surfaces, remove dust, and apply an exterior finish according to its label. Coat the undersides of the slats and the cut ends as well as the visible faces; end grain absorbs water readily. For a low-maintenance schedule, use an exterior penetrating finish you can clean and reapply without stripping. A water-based outdoor paint is another option, but every cut and joint needs full coverage and any damaged areas should be touched up promptly.
Set the table on a reasonably level surface, not directly in soil or a puddle. Recheck screws after the first few weeks as the wood dries and moves. If the table rocks, confirm the ground is level before shortening a leg; cutting a leg to compensate for uneven paving can make the table unstable elsewhere. Store cushions indoors, and refresh the finish when water stops beading or the wood begins to look dry.