Introduction: DIY Concrete Top Coffee Table

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This Instructable is how to make a DIY Concrete Top Outdoor Coffee Table. The base is made from cedar 2x4's and the top was my first time working with concrete. You can also see the full blog post at:

Tools Used (affiliate):

Materials Used:

Step 1: Cut the Parts to Size and Drill Pocket Holes

Cut all the table base parts with three 33” pieces for the aprons and lower stretcher, five 21” boards for the side top and bottom and center support, and four 16-½” boards for the legs.

Find the best side of each board and mark for pocket holes.

Drill pocket holes on the backside of all the parts except for the legs.

Step 2: Assemble the Base

Assemble the sides by joining the legs to the top and the bottom with glue and 2-1/2" exterior pocket screws.

Flip the side assemblies on edge and connect them with an apron with glue and screws.

Flip the table base back over and Install a center support to help with the weight of the concrete. Position it between the aprons then secure it with glue and screws as well.

Apply your choice of finish to the base (I used an outdoor spar urethane) and let it dry while you work on the concrete.

Step 3: Make the Concrete Form

Cut a melamine sheet to 30” wide by 48” long. Use the offcut to get two long sides at 1-1/2" wide and the full 48” long.

Crosscut the 30x48 piece down to 30” by 44” and use the offcut and rip down two pieces to 1-1/2" by 30”.

Place the table base on the form and secure the long sides on edge using 2" countersunk screws. Cut the short sides to fit and install them the same way.

Vacuum out the form and caulk the seams with a silicone caulk. Put tape over all the screw heads so concrete won't get in them.

Cut rebar mesh for support for the concrete top. Use bolt cutters and trim it about 1" in from all the sides. Lastly, clean up the form with some rubbing alcohol to get any residue off the surface.

Step 4: Mix and Pour the Concrete

I used a countertop mix concrete and mixed it per the bag instructions. Fill the form and work the concrete around to about 1” thick.

Then press the rebar mesh into the concrete.

Use a straight piece of wood to screed the surface flat. Ride the board along the top of the form in a sawing motion and this levels and distributes the concrete.

Use a reciprocating saw (no blade installed), sander, or something similar and vibrate around the form to help release air bubbles.

Trowel the bottom surface smooth so it will sit flush on the base. Then cover the form with plastic and let it cure.

Step 5: Prep the Finished Top

After the concrete has cured, remove the concrete from the form and sand the top with 120 grit then 220 grit sandpaper. Mix a slurry of portland cement or just the concrete mix to a toothpaste consistency and fill in all the air pockets on the sides and top. When dry repeat the sanding process.

Apply concrete sealer per manufacturer’s recommendation with a microfiber cloth. You may need to wait up to 30 days to do this depending on your sealer.

Step 6: Install the Top on the Base

Install rubber feet on the bottom of the base to keep the wood away from standing water.

Put a dollop of silicone on at several spots on the top to keep the top from shifting then place the top on the base. I used the long sides of the form as spacers when installing the top so we didn’t pinch our fingers.

If you liked the video please subscribe to my YouTube channel!

And if you want full detailed plans and 3D drawings you can get them here:

And if you feel like I've earned it I'd appreciate a vote for the Tables and Desks contest, just hit the "Vote!" button on top right.

Tables and Desks Contest 2016

Third Prize in the
Tables and Desks Contest 2016