Why Do Plaster Walls Handle Water Better Than Drywall?

Plaster walls are made from a dense mix of lime, sand, and water, often applied over lath or masonry. This creates a hard, compact surface that resists water penetration far better than drywall. Drywall consists of a gypsum core sandwiched between paper layers, and both the paper and gypsum are highly absorbent.

When water hits drywall, it wicks into the material quickly, causing the paper to bubble and the gypsum to soften. Plaster, on the other hand, has a much tighter structure, so water beads up or runs off rather than soaking in. This means plaster can often survive a spill or leak with only surface staining, while drywall may need to be cut out and replaced.

• Plaster is denser and less porous than drywall.
• Drywall's paper face and gypsum core absorb water rapidly.
• Plaster can sometimes be dried and repainted after a small leak.
• Drywall often swells, sags, or crumbles when wet.
• Plaster's thickness adds structural resilience.
• Water damage to drywall is usually more extensive and permanent.

Drying a wet plaster wall is often more straightforward than drying drywall. Plaster can be dried with air movers and dehumidifiers, and once dry, it may only need a coat of primer and paint to cover any stains. In many cases, the structural integrity of the plaster is preserved, so you avoid the mess and cost of tearing out and replacing large sections.

If you have water damage on any wall, whether plaster or drywall, it's wise to have a professional assessment. The pros can determine the extent of the damage, check for hidden moisture, and recommend the right course of action. Water damage can be deceptive, with moisture traveling along studs and behind baseboards, so a thorough inspection is valuable.

For plaster walls, the pros can often dry and repair the wall, saving you the cost and effort of replacement. For drywall, they may need to remove and replace damaged sections. In either case, acting quickly reduces the risk of mold and structural issues.

The cost of repairs depends on the extent of the damage, the type of wall, and the drying time needed. Policies vary, and your insurer decides what is covered. If you're unsure whether your insurance will help, check your policy and contact your insurance company to ask about your coverage.

• Call the pros if you see stains, bubbling, or sagging walls.
• Act fast to dry walls and prevent mold growth.
• Keep records of the damage for your insurance claim.
• Ask about drying equipment to minimize damage.
• Check your policy to see what water damage is covered.
• The pros can help with water extraction and wall repair.