Table of Contents
- 4About the measurements, Materials you will need and Informative notes
- 5Materials continued and cutting list for the form
- 6The plans - dimensions
- 7The form plans - schematic
- 8Step 1.1 Cutting and assembling the frame pieces of the seat form
- 9Step 1.2 Cutting the plywood, the plastic, and assembling the seat form
- 10Step 1.3 Cutting the form pieces for the legs
- 11Step 1.4 Assembling the forms for the legs
- 12Step 1.5 Aligning and bolting the leg forms to the seat form
- 13Steps 2.1 to 2.3 Cutting, shaping and tying the mesh
- 14Concrete mix information
- 15Steps 3.1 to 3.2 Dry and wet mix
- 16Steps 4.1 to 4.3 Applying the release agent, half filling the seat form and placing the reinforcing
- 17Steps 4.4 to 4.5 Topping up the seat form and attach the leg forms to the seat form
- 18Step 4.6 Topping up the leg forms
- 19Step 4.7 Releasing the leg forms
- 20Step 4.8 Releasing the seat form
- 21Appendage: Easier options
Step 1.2 Cutting the plywood, the plastic, and assembling the seat form
Cut a rectangular piece of ⅝” (15mm) thick plywood, 40″ long x 22″ wide (1000mm long x 550mm wide).
Also cut a rectangular piece of ⅛” (3mm) thick *plastic sheet, 40″ long x 22″ wide (1000mm long x 550mm wide).
*Note: The plastic sheet is to make a smooth finish on the top of the seat. The end product of a concrete cast will be as smooth as the form. The plastic sheet can be any thickness, or you can disregard it altogether, in which case the finished product will be as smooth as the plywood form – which can still be an acceptable finish.
Lay the piece of plywood on a flat even surface.
Then lay the plastic sheet on top of the plywood sheet and the ‘picture frame’ on top of that.
Temporarily hold everything in place with clamps while you screw the all the pieces together.
Fix (glue and nail) strips of ½” (12mm) *angle fillet (f) around the inside perimeter of the seat form against the frame and the plastic sheet.
*Note: Angle fillet is a triangular shaped strip of wood. Its purpose is to make a beveled-type edge around the top of the seat. You can use a different profiled piece of wood if you want something a bit more fanciful, or you can disregard it altogether, for a plainer look.