Instructables
Picture of Concrete Christmas Tree
This concrete christmas tree is made using the same foam forming approach as the Concrete STOP.

Materials + Supplies:
  • Foam
  • Plastic Liners
  • Base Board
  • Spray Adhesive
  • Rubber Gloves
Tools:
  • Something to Cut Foam
  • Sandpaper
  • 100% Silicone Caulk
  • CHENG Corner and Seam Shaping Tools
Concrete Mix:
  • Sakrete 5000+ Concrete Mix (or similar)
  • CHENG Evergreen SmartColor Pigment
  • Decorative Aggregate
 
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Step 1: Preparation

Picture of Preparation
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First thing to do is get some foam and figure out what shape to cut.

Any type of EPS (expanded polystyrene) foam will work, from styrofoam that you find in the trash, to insulating foam that you buy at a building supply store. Foam that is more dense will sand to a smoother finish. For this project, two sheets of 1" thick pink insulating foam were glued together with an adhesive made for foam. This adhesive won't melt the foam and gives a strong bond.

  • Spray both sides liberally with foam-lok adhesive.
  • Wait 4+ minutes and then press together.
  • Check for gaps around the edge and press them together.
Using a 3D modeling program like sketchup is a quick way to make a model and see how it looks. From the model you can print out a 1:1 template to trace onto the foam.

The main concern in this project is that the walls aren't too thin and that the piece will have room for a tea light candle at the base.

Step 2: Trace Shape onto Foam

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  • Print and cut out a 1:1 template.
  • Trace the shape onto the foam.

Step 3: Cut Foam

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  • Cut the foam out with a hot wire, CNC router, jig saw, utility knife, scroll saw, band saw, laser cutter, whatever you have available.
  • Leave some room when cutting the foam so you can sand it to the exact size.
In this project, the foam will be lined with plastic, so the quality of the cut isn't that important.
Such a cool idea! can't wait to make one :)
AngryRedhead11 months ago
Looks great! Very creative!

And when it's not Christmas, you can use it as a giant real life cursor and not worry about storing it after the holidays. :D