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Compost bin

This compost bin, easy to make, is built in blocks. It rests on a concrete sole similar to that of the brick planter. Place it preferably in a discreet location of your garden. This bin will produce the compost necessary for planting seedlings, planting, and repotting plants.

Necessary material

  • Float
  • Trowel
  • Bubble level
  • Plumb-line
  • Hammer
  • Roller
  • Brush
  • Screwdriver
  • crank shaft
  • White plaster
  • Plywood panel
  • Screw
  • battens
  • Cement
  • Breeze blocks (50 x 20 x 10 cm)
  • Product treating for wood
  • Metal handle
  • Large section pipe

Steps

  1. Mounting
  2. finishes

Mounting

Application of a mortar layer

Application of a mortar layer

1. When the foundation footing is dry, apply a layer of mortar trowel all around the perimeter. Use bastard mortar. The breeze blocks used, sold by all specialized traders, measure 50 x 20 x 10 cm. The concrete footing is not essential: decomposing compost can be in direct contact with the ground. In this case, it is enough to make foundations for the walls of blocks.

The first row starts from an angle

The first row starts from an angle

2. Begin laying the first row from an angle. Carefully check the verticality of each block with a bubble level or a plumb bob. Correct the position, if necessary, by pushing the breeze block into the mortar, hammering it with a hammer or the handle of the trowel.

The walls are mounted with broken joints

The walls are mounted with broken joints

3. The compost pile will exert a strong enough pressure against the walls: to reinforce their solidity, mount them with broken joints (see photo). Cut the blocks with a hammer and a mason's chisel. Use small openings in the wall to ensure aeration of the compost (necessary for its decomposition) by placing shims at the joints. Remove them as soon as the mortar starts to set.

finishes

Application of an exterior decorative coating

Application of an exterior decorative coating

4. Four rows of blocks (80 cm) are enough. If the tank is in a passage area, it is better to provide an exterior decoration, because the appearance of the blocks is not very aesthetic. The best is to use an exterior decorative coating, which goes by roller. A trowel-applied white cement plaster is also suitable for this construction. A good solution is to hide the tray by placing around some shrubs, boxwood or privet, for example.

The door must be able to be lifted

The door must be able to be lifted

5. The door is made of a plywood panel (or blockboard), rather thick, which slides up and down between the grooves of the blocks; an opening of 30 cm is enough. Treat this panel with a product against moisture and pests; apply, for the finishing, several layers of paint so that the wood is well protected. Screw a stainless steel handle securely into the top edge of the door. This system makes it possible to collect the compost at the base of the tank, where it is the oldest, and therefore better.

A perforated plastic pipe ensures aeration

A perforated plastic pipe ensures aeration

6. To be rot-free, the fermentation of vegetable waste needs good aeration. Favor it by placing a plastic pipe (a gutter down section, for example) in the tub, pierced along its length with a series of holes, made with a crankshaft.

On the same topic

  • DIY tips
    • Lawn mowers: selection criteria
    • Masonry: materials, products and proportions
    • How to build a brick planter
    • How to make earthworks and foundations?
    • How to mess up concrete?

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