How Does Water Damage Affect Drywall vs Plaster?

Drywall, made of gypsum pressed between paper layers, acts like a sponge. When water hits it, the paper wicks moisture inward and the core softens. Even a small leak can cause visible swelling, staining, and a mushy texture within hours.

You can often spot the damage as a sagging ceiling or a bubbled wall surface. If the drywall stays wet for more than a couple of days, mold can start growing on the paper backing. The usual fix involves cutting out the damaged section, drying the framing behind it, and installing new drywall.

For drywall, look for stains, soft spots, peeling paint, and a musty smell. Press gently on the wall; if it gives way or leaves a dent, the core is damaged. Discoloration often appears as brown or yellow rings.

Plaster may show hairline cracks that widen over time, or a powdery residue where moisture has leached salts. You might also see bulges or a hollow sound when you tap. Water behind plaster can be hidden, so use a moisture meter if you have one.

Act quickly when you spot water, because the longer it sits, the more damage you'll have. Turn off the water source if you can, and move furniture away from wet walls. Open windows and doors to increase airflow, but don't use high heat.

If you live in Bellingham, keep your shutoff valve location written down. A small leak can become a big problem in a wet climate. For serious damage, a water damage inspection can map out what's affected and guide the repair process.