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Foster Lyons is an engineer and building-science consultant based in Trumbull, Conn. You can subscribe to his weekly newsletter, called Building Science Sunday, by following this link.
The average new home contains about 1,700 gallons of excess water, which will cause problems without an effective management and drying strategy.
The answer depends on the size of the overhangs, the type of foundation, the climate, and the surrounding soils.
Learn why a building scientist thinks there is no good reason to use an underlayment between wood flooring and the subfloor.
Make sure the wall is well-pointed, then apply your choice of material on the inside to stop air ingress while still allowing water-vapor transfer.