Damp is one of the most common causes of damage to wood. An excess dampness causes the wood to swell and cause the surface to become concave. When this happens, the wood no longer has a flat or smooth surface, but it’s more complicated than that. Damp is caused by two things: water vapor in the air and organic matter in the wood
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The moisture in the air is responsible for condensation on windows that cause them to become frosted or cracked. This can be an aesthetic problem that affects furniture because it can make the wood swell in some places. You can prevent this by opening up windows in the rooms where you store your furniture, using fans when you store your furniture during winter, and sealing up holes where humidity can accumulate.
The organic matter in the wood is the second source of damp. This usually comes from sap in trees, plant roots or even insects that create tunnels underground where there is no air movement, allowing them to live without losing moisture. It also happens when you have fungal growths growing on your wood surfaces, which are insect-attracting foods for other insects that sometimes create damp spots due to their waste matter.