Quick Answer
A good foundation for an outhouse typically involves a 4-inch thick concrete slab, with a footprint that's about 25% larger than the outhouse itself. The slab should be sloped to allow for proper drainage and to prevent water from accumulating under the structure. It's also essential to ensure the foundation is level and securely anchored to the ground.
Laying the Foundation
When building the foundation for an outhouse, start by excavating a trench that’s about 12 inches deep and slightly wider than the slab will be. Fill the trench with compacted gravel to facilitate drainage, then pour a 4-inch thick layer of concrete. Use a level and a spirit level to ensure the slab is perfectly level and plumb.
Sloping the Slab
The slab should be sloped at a rate of about 1/4 inch per foot to allow for proper drainage. You can achieve this slope by using a mixture of sand and cement to create a smooth, even surface. Make sure the slope is consistent and doesn’t create any low spots that could collect water.
Anchoring the Foundation
To prevent the foundation from shifting or settling over time, it’s essential to anchor it to the ground. You can do this by digging a few holes around the perimeter of the slab and filling them with concrete. Then, attach rebar or anchors to the slab and bury them in the concrete. This will ensure the foundation stays secure and level, even in areas with high winds or heavy rainfall.
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