Earthen Floors: A Modern Approach to an Ancient Practice by Reay Crimmel Sukita & Thomson James

Author:Reay Crimmel , Sukita & Thomson, James [Thomson, James]
Language: eng
Format: azw3, epub
ISBN: 9781550925616
Publisher: New Society Publishers
Published: 2014-04-20T16:00:00+00:00

Placement of vapor barrier in a wood-framed subfloor.

(CREDIT: JOHN HUTTON)

Drainage

Every on-grade subfloor should have a drainage layer. This is usually a layer of drainage rock, and in very wet soils may also include drainage pipes and/or a French drain. An important role of the drainage layer is to provide a capillary break, so that moisture in the ground cannot easily wick up into the upper layers of the subfloor. See Building a Compacted Gravel Subfloor appendix for more information, and consult a building professional if needed.

Vapor barrier

The ground contains moisture, which evaporates into water vapor. This vapor can migrate from the ground below up into the house; condense back into liquid water and cause increased humidity, mold growth and, in extreme cases, rot.

A vapor barrier is a waterproof membrane that blocks the movement of water vapor. Most building codes require the use of one in new construction; 6 mm black polyethylene plastic sheeting is the current standard for most situations. There are also paint-on barriers available for use on concrete slabs. Often a vapor barrier is added in conjunction with insulation. If working with a pre-existing subfloor that may not include a vapor barrier, consider adding one or test to see whether one is present.

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