Indoor. Outdoor. Concrete Tables.
A tutorial by
.- 4 – H-Frame Table & Bench Legs, in desired sizes and finishes (we used 28"x12" and 20"x12" in raw steel—for outdoor use, we recommend our rust-resistant powder-coat finishes)
- Plywood
- 1x2 lumber
- Tape measure
- Pencil
- Straightedge
- Clamps
- Circular saw
- Orbital sander and sanding disc, optional (to adjust lumber for a tightly fitted form)
- Drill/driver and bits (we used a 3/8" masonry bit)
- Painters tape, optional (to mark your drill bit to avoid drilling too far)
- Screws (we used #8 x 2-1/4" deck screws for the forms, and 1-1/2" masonry screws to attach our legs)
- Caulk and caulk gun
- Concrete mix (we chose a post concrete for the pebbles and quick dry time) and mixing supplies
- Rebar or mesh supplies to reinforce your tabletops, if needed (see below)
- Hand trowel
- Hammer
- Shovel
- Sanding and finishing supplies, if you'd like to finish your tabletops (see below)
- Safety gear such as eye protection, a mask/respirator, and gloves
A few things to consider when planning your build:
- Reinforcement. The tables we built were small, so we decided to not use any internal reinforcement. If you want to create a larger table, or a tabletop that will bear weight, you’ll want to reinforce the concrete. To do so, pour a small first layer of concrete into your form, place rebar or wire mesh, and finish pouring the concrete.
- Concrete dry time. Be patient while waiting for your concrete to dry. While our bag of concrete said it would set within a few hours, we waited overnight to make sure we had as solid of a surface as possible before we took it out of the forms.
- Finishing your concrete. Surfaces used every day or outdoors should see some sort of treatment. If you want a smooth finish, fill in the holes with concrete filler, and sand to your desired level of smoothness. A concrete sealer coated on top will protect your slab for years to come.


Mark Won
Maker | Semi Exact Team Member
I love using recycled/upcycled material to build beautiful furniture fit for any modern home. Officially, I’m a Semi Exact employee, but tinkering and DIY has been a hobby since childhood. Added dream job bonus: pursuing my love of interior design.
I hope to learn from the many skilled makers out there, and to turn my builds up a notch!


Step 1:
Cut wood for concrete forms

Step 2:
Adjust pieces if needed

Step 3:
Assemble the forms

Step 4:
Drill in your side boards

Step 5:
Caulk the forms

Step 6:
Smooth out the caulk

Step 7:
Mix the concrete

Step 8:
Mold the concrete

Step 9:
Smooth the concrete

Step 10:
Remove the forms

Step 11:
Wax raw steel legs

Step 12:
Attach your legs
