5 Common Signs of Deck Rot

If you step onto your deck and it feels spongy or crumbly underfoot, it may be developing deck rot, a wood condition caused by a combination of fungi and moisture. Some additional signs of deck rot include musty odors and visible mold, and chunks of wood may be missing.

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If it's not addressed promptly, deck rot can sometimes lead to structural damage and an increased risk of injuries. Knowing how to spot deck rot and taking steps to fix it as quickly as possible may help you prevent further issues.

What Is Deck Rot and What Causes It?

Deck rot, also referred to as wood rot, happens when excess moisture causes deck wood to deteriorate. Outdoor decks are under constant assault from elements such as rain and snow. Most decks are sealed with waterproofing treatments to help extend the lifespan of the wood, but these sealants can wear off over time. When this happens, moisture can make its way into weakened areas and damage the wood.

Wood rot occurs when fungus develops in areas where moisture has infiltrated the boards. The fungus eats away at the wood fibers or cellulose, creating soft spots, crumbling areas and splintered boards. If early signs of wood rot aren't addressed in a timely manner, the risk of structural failure increases.

What Are Some Common Signs of Deck Rot?

The amount of time it takes for deck rot to develop can range from a few months to a few years or longer. This makes it important to inspect your deck regularly for possible signs of rotting and address any issues promptly. Here are five common signs of deck rot to check for:

• Soft, spongy boards and beams. Soft spots and wood with a spongy texture are common signs of deck rot. These issues can occur when water seeps into the wood and breaks down the fibers. Over time, wood fungus can develop and further weaken the decking.

• Discolored wood. If the wood on your deck appears faded or discolored, this may be due to moisture infiltration deep inside the boards. Excess moisture can allow fungal growth, damaging the wood fibers and causing a faded appearance.

• Mold or mildew growth. Visible mold or mildew or musty odors can indicate waterlogged or rotted wood. When excess moisture saturates wood decking, it creates an ideal breeding ground for mold spores. You may also notice visible fungus or mushroom-like growths on the rotted areas.

• Termites. Soft, weakened wood can serve as a ready food source for hungry termites. If your deck is rotting, you may notice signs of insect activity, such as small droppings that resemble coffee grounds or termite swarms.

• Loose deck boards. When moisture sets into your decking, it can weaken the wood. This can result in unstable or loose deck boards, increasing the risk of further damage and potential injuries if areas of the boards collapse.

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What Are the Potential Dangers of a Rotted Deck?

Having moisture and fungi invade your deck can lead to a host of issues. Mold spores and mildew growth can cause unpleasant musty odors and trigger potential allergic reactions in sensitive individuals. As wood rot takes over, it can weaken the beams under your deck to the point that the wood starts to crumble. Stepping on a weakened deck may also cause wood breakage and put you at risk of injury.

How to Stop Deck Wood From Dry Rotting

Taking preventive measures, such as regularly treating your deck with water-resistant sealant and scheduling periodic inspections, may help prevent wood rot from developing. If you live in an area prone to wet or snowy weather, installing composite decking is another option to help keep deck rot at bay. Composite decking looks similar to natural wood, but it's crafted from recycled plastic and wood fibers. This helps make it highly resistant to the elements and very durable. Plus, composite products generally require less maintenance and upkeep than traditional wood decking.

If you've noticed rotting wood, water damage or other signs of deck rot, it's best to schedule an inspection with a licensed deck contractor or carpenter. An experienced professional can assess the extent of the issue and advise you on available solutions to keep your deck in good condition.