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March 9, 2001

Defeating Wood Decay

Even in well-constructed and designed buildings, wood decay can occur. Greater Vancouver’s mild, rainy climate means wood buildings are exposed to large amounts of moisture. This can lead to the development of fungus (plural: fungi), which causes wood decay and damage.

Decay fungi are plants that feed on wood, decomposing it and weakening its structure. The signs of fungi attack are often difficult to detect.  The decay process is gradual and may occur over many years. 

To determine if you may be the victim of wood decay, take a tour of your home and property. Be on the lookout for discoloration, small uneven holes or a crusty, crumbling surface. Outdoors, pay particular attention to wooden eaves, trim, window casings, steps, railings, decks, fences and sheds. These area are the most likely to show development of fungi.

Inside your home, look for condensation on wood frame windows, areas around leaking plumbing, ceiling and wall stains, areas that may have experienced rain leaks and excess moisture in your crawl space.

If you spot signs of decay, the first step is not to panic. The solution to the problem will depend on the severity of the damage. You may need the services of a specialist to identify the extent of the problem. 

The easiest way to deter and prevent decay it is to eliminate any source of moisture that may have caused it in the first place. That means:

• regularly maintaining gutters so that water drains properly away from your home;
• controlling groundwater
• pruning bushes and shrubs adjacent to your home that may trap moisture and channel it down exterior walls.

Consider installing a vapor barrier over soil in your crawl space and a ventilation system that includes a dehumidifier. On warm days, ventilate closets and cabinets and clean away any mould or mildew with a bleach solution.

To make wood last longer, there are exterior finishes that repel water and act as a deterrent to decay. These finishes are effective in high-risk areas such as outdoor decks and walkways, are non-corrosive and are environmentally safe.

If the fungi have damaged the wood, it will likely need to be repaired or replaced. Before you hire a specialist to determine the cause of the problem, get referrals, request qualifications and at least three references.  That way you ensure your repairs will correct wood decay for the long term.