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Base (or layers of base materials) under the floor

(See illustration of layers that make up the floor, on page 57).

Reasons for putting a base under the floor:

Moisture barrier between the ground and the floor?

The general rule with natural building is to avoid moisture barriers if possible. With good drainage design and an adequate gravel base, your floor shouldn't need a moisture barrier.

Floor base tests

You can make floor base experiments in 4 or 5 inch plastic potted plant containers. Fill them with the materials you have available, and tamp each layer. Then push them out of the container molds. See which are the toughest. Regardless which base you decide on, tamp, tamp, tamp!


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