Free Range Designs Compost Toilet Box User manual

Compost Toilet Box
Assembly Instructions for a Compost Toilet Box,
designed by Free Range Designs

This compost toilet box is the simplest complete composting system (apart from a hole in
the ground of course). When using, add a handful of soak - saw dust, rice husks, wood
shavings etc. - to balance the bre content of the poo compost. Empty the bucket when
full and use the urine fresh in small quantities on your ower beds and fruit tree beds as
an excelent natural fertiliser.
All you need to construct this are the instructions you are reading, a few hand tools and
the materials listed below.
Introduction
Minimum tools needed:
• Tape measure,
• Pencil,
• Panel saw,
• Pozi headed screw driver,
• Set square,
• Clamps
• Waterproof wood glue,
• Sand paper,
• Danish oil
(Power tools such as drill driver, mitre
saw, table saw, sander, planer, nishing
nailer etc. would be handy if you have
them)
Materials: Get these from your local builder’s merchants.
NOTE - Check what dimensions you can source easily before cuing any pieces; for
example the 35mm square prole timber may be dierent dimensions and therefore
you’ll have to adapt the design to suit.
• Approx 2.4mm of 35x50mm of timber, spruce/pine or larch or douglas r.
• Minimum of 1100x1600mm of 12mm plywood, good quality (birch topped or
hardwood).
• Minimum of 544x514mm 18 mm ply for top/lid.
• 1 toilet seat (if made of wood it can be modied to create a more air tight seal)
• 2 x small brass or stainless steel hinges approx 40-50mm long and now greater than
18mm wide (to t the 18mm plywood top).
• 20mm, 25mm, 35mm and 80mm screws, and some suitable length panel pins to x
35mm or you choice of timber dimension to the front plywood sides.
• 1 x bucket purchased through eBay using suggested search term ‘20 Litre Plastic
Bucket with Lid’ (compost toilet designed to t bucket of these dimensions - design
change needed at various points if using dierent bucket).
• 1 x at boomed urine collector
• 1 x urine separator provided by Free Range Designs.

Front
Prepare:
12mm ply - 2 pieces @ 514x495mm
2 pieces @ 510x495mm
1 piece @ 510x490mm
35x35mm 4 pieces @ 483mm
Back
Bottom

Assemble main box as shown Glue and screw, and pin if necessary. Ensure they are square. and that the
internal dimensions are the same as the base, as shown.

Next, cut the seat ply to and cut an eliptical hole, larger than the toilet seat itself. e easiest way to get the
correct shape is to draw round the inside of the toilet seat and increase the ‘diameter’ of the hole by approx
20mm. It should be central width ways, and approx 7cm from front.
NOTE: Use these measurements as a guide only as your toilet seat hole size WILL dier. e hole should be
situated such that the front of the toilet seat overlaps the edges of the hole and should be as close as possible
to the front of the ply.
seen from below
If you have a wooden toilet seat to use:
Before xing the seat onto the ply it needs adapting. is
is so the seat creates a more air tight t that will function to
stop any undesirable odours and stop ies from gathering.
See next page on how to do this.

Remove all parts of the toilet seat except the seat itself
and the lid. is means removing the pad/feet on the
seat and lid and the hinges and xings.
en you should just have the bare lid and bare seat.
remove
Next, draw a line at the rear of the seat and lid and
cut the rear end o both. You only need to cut o
enough so that the two will have a at back (as shown
right).
Now take two small hinges and screw lid to the seat
(see right).
Now screw, from the underside of the ply, the seat to
the seat plywood.
Cut a block to t against the back of the toilet seat, in
between the two hinges, as shown right.

Cut the urine container platform as per the diagram.
Centre the urine container and make sure it’s up
against the front wall of the box.
Ensure the location is central on the ply from either side and that the spout of the separator will t directly
into the urine collector when the seat is tted onto the box.
Coat the cladding in a few layers of Danish Oil (you may want to coat the inside of the box also), and wait for
it to dry. Place the bucket inside, put the seat on and your compost toilet box is ready for use.

Screw your lid to the box, as shown below. Next cut a small ocut piece of the 18mm ply
and screw just a few millimeters lower than ush to the top of the box, to act as a stop for
the lid.
en place the urine container platform into the front of the box, and also the poo bin
behing it, as shown below, and there you have it :)