Make Concrete Garden Boxes PART 1 – Precast Form Build

Assemble the SIDES

Now assemble the Sides with glue and screws.

Attach side walls to side hold-down
Attach side walls to side hold-down

I attached a stop strip to my workbench and onto it I attached two hold down clamps. The clamps quickly and securely hold part C to the table. I also attached an end stop to align the ends of B and C.

Hold down clamps - man about tools cast form mold concrete garden boxes
Hold down clamps

Then apply a small bead of exterior wood glue to the side and press it into place. I drill a pilot hole into the hold-down strip then run in a screw.Then drill pilots thru the side all the way down and secure it with screws. Check each assembly that the L shape is 90 degrees.
Set these aside for the glue to set up.
The Sides have a small square Stop Block to hold the ends in place. Rip and cut these to length.

Drill pilot holes in small square stop block - concrete garden boxes
Drill pilot holes in small square stop block

Then pre-drill these as well.

Assemble the ENDS

Now assemble the ends parts E and F.

Attach block to end assemblies
Attach block to end assemblies

I marked the center of each to help with alignment and also used the hold down clamps to secure the pieces during assembly. Like before, apply glue, drill, and attach with screws.
Drill pilot holes into E and attach the Blocks with glue and screws.

Attach stop blocks to side assemblies
Attach stop blocks to side assemblies

Mark the side assemblies and attach the small square Stop Blocks with glue and 1″ screws.

Make the INSET

Next we will make the angled Inset.

Rip Inset at 30 degrees on table saw
Rip Inset at 30 degrees on table saw

I used 5/8″ material, and beveled the sides 30 degrees on the table saw. And cut to length on my miter saw also at 30 degrees.

Attach inset with glue and screws
Attach inset with glue and screws

I attach the Inset part to the base by pre-drilling with a countersink, then attaching it with glue and short screws.

Reduce end of dowel to fit into pipe
Reduce end of dowel to fit into pipe

Lastly, I’ll cut the 5/8″ Dowels to length and chamfer the end on the disc sander, or you can round off one end with coarse sandpaper.

Glue dowels into block and sides - man about tools cast form mold concrete garden boxes
Glue dowels into block and sides

Glue these into place and let the glue fully setup.
Cut a short test piece of half inch PVC electrical conduit.

Test fit pipes on dowel pins
Test fit pipes on dowel pins

Use this to test fit the Dowel Pins. Use some sandpaper to slightly reduce the diameter of these dowels so the pipe slips on easily. The inside diameter of the pipe is bit less than 5/8″.

Fill screw head holes with wood filler
Fill screw head holes with wood filler

Fill the screw holes with wood-filler, let it dry completely, then sand smooth. Also fill any gaps in the plywood and add some filler to the inset where it meets the base. Give everything a light sanding to break any sharp edges.

Continued on the Next Page

Shopping Cart
Scroll to Top