How to Prevent Fungus Damage to Wood Structures

The general principles for protecting wood from decay are discussed. Most problems of decay can be met either by moisture control or, when this is not feasible, by use of wood that has been chemically treated or is naturally resistant to decay. Decay in buildings can be controlled by using dry, sound lumber and by designing the structure so as to reduce wetting by soil-water, rain, or condensation. When moisture control is doubtful or not feasible, use a decay-resistant wood or one treated with preservative chemical. Concrete slabs can be built on noncapillary material combined with a water-proof membrane. Wood in contact with concrete slabs should be chemically treated. Vapor barriers should cover the ground beneath basementless houses and the crawl-space should be ventilated. Porches should be designed to resist wetting and to dry quickly. Exterior millwork should be protected through the use of roof overhang, metal flashings, treatment with water-repellent preservatives, and by caulking of joints. Sheathing paper should permit water vapor to pass through it. The installation of a vapor barrier as near the warm surface of the wall or ceiling as possible is recommended. Good attic ventilation also helps.

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