There are a few building features which are essential to insuring that the composting process works consistently and is compatible with environmental and nuisance concerns. A roof is necessary to prevent rainwater from reaching the compost and creating fly breeding situations and unsatisfactory composting conditions. It will also prevent run off from the compost into the ground or surface water. A roof overhang of two feet with guttering is recommended if compost bins are located on the sides of the building. An impervious weight-bearing foundation such as concrete is critical for an all weather operation.
Concrete allows easier cleaning, preventing litter and compost runoff during rain events.
It will assist with rodent control as well. Pressure-treated lumber will resist rotting which the composting activity encourages. The cost of materials for composters will vary considerably. Copies of these drawings and material listing are available through your local county extension agent office. Composter Bin Design Bins constructed inside the composting building need to meet certain criteria to facilitate composting and enable easy turning of the compost.