I love a project that makes a patio feel finished without turning into a full construction job, and this outdoor daybed platform is exactly that kind of build. By laying cedar deck boards over stacked concrete deck blocks, you get a low, sturdy base that looks custom-made, then you top it with a thick weatherproof cushion for a spot that feels equal parts lounging bench and backyard retreat.
This is a great project for anyone who wants comfortable outdoor seating with a clean, modern look and no complicated framing. I especially like it for families, because it creates one big place to stretch out with a book, share snacks, or pile on outdoor pillows for movie night on the patio.
Materials
6 cedar deck boards, 5/4 in. x 6 in. x 8 ft.
Instructions
1. Mark out a rectangle about 30 in. x 78 in. on your patio or yard, and check that the area is reasonably level. If you are setting it on soil, remove the top 2 in. of grass or loose dirt first.
2. Lay down the landscape fabric over the footprint, then spread the gravel evenly on top and tamp it flat. This gives the blocks a cleaner, more stable base and helps with drainage after rain.
3. Arrange the 8 concrete deck blocks in two rows of four, spacing them evenly so they support the cedar boards across the full length. Check each block with a level and use rubber shims where needed to make the tops even.
4. Sand the cedar boards lightly to smooth any rough edges, then wipe away the dust. Brush on the exterior wood sealer and let the boards dry fully according to the product directions.
5. Lay the six cedar boards side by side across the blocks, keeping the ends flush and leaving a small gap of about 1/8 in. between boards for drainage. Center the boards so each end overhangs the outer blocks evenly.
6. From underneath, connect neighboring boards with galvanized mending plates, placing plates near both ends and at the center to keep the platform acting as one solid piece. Fasten each plate with the 3/4 in. structural screws.
7. Drive a few 2 1/2 in. deck screws down into the block contact points only where the board positions need help staying aligned, being careful not to split the cedar. In many cases the weight of the platform is enough, so use only what is necessary.
8. Test the platform for wobble by pressing on all corners and the center, then adjust shims or block spacing until everything feels steady. This is the step I never rush, because a few extra minutes here makes the finished seat feel store-bought.
9. Set the ivory weatherproof cushion on top and center it so there is a slim cedar border visible around the edges. Add the hook-and-loop strips between the cushion underside and the boards if you want to keep it from shifting on breezy days.
10. Finish with outdoor pillows and place the daybed where you will actually use it, whether that is a sunny patio corner or under string lights by the grill. Once it is styled, it becomes the spot everyone drifts toward.
Variations & Tips
For a larger lounge: Use 8-foot boards with a wider layout and add a third row of blocks down the middle so two people can stretch out comfortably.
For picky weather: If your yard stays damp, choose extra-thick rubber shims and make sure the board gaps stay open so water does not sit on the cedar.
Cushion shortcut: A deep-seat bench cushion or twin-size outdoor cushion works well if you cannot find a daybed cushion in the exact size.
Family-friendly comfort: Add a washable outdoor throw blanket and a few softer pillows, especially if kids will use this for reading or snack time outside.
Wood option: Cedar is my favorite here because it handles outdoor conditions well and smells wonderful when you are cutting and sanding it, but pressure-treated deck boards can work if you let them dry thoroughly before sealing.
Keep it looking nice: Reapply a clear exterior sealer every year or two, and store the cushion in a deck box when heavy storms are coming through.
Before you build: Double-check your cushion size first, then build the platform about 1 to 2 inches larger in both directions so the finished piece looks intentional and not squeezed.