Wet drywall and floors: water damage drywall repair in NYC apartments

NYC Water Damage Repair is an independent referral service, not a restoration company or contractor. When you send the form, your details go to an independent local restoration provider serving New York City, who can contact you, inspect and quote any work directly. You decide whether to hire them.

Three questions decide it

1. What kind of water was it? The IICRC S500 sorts water into categories by contamination, considering its source and what it touched. For Category 2 or 3 water, the S500 calls for remediation before restorative drying, so more material is removed.
2. How long has it been wet? EPA’s guidance is to dry water-damaged areas and items within 24 to 48 hours to prevent mold growth. The longer a material stays wet, the more likely it is to be replaced rather than dried.
3. What is behind it? Insulation, a vapor barrier or a second layer of board holds water against the wall and slows drying.

Drywall

Drywall is gypsum between paper faces. In general practice, drywall wet with clean water and dried quickly can often stay, especially if the cavity behind it is empty. Drywall that is soft, crumbles at the bottom, has swollen or sagged, or got wet with contaminated water is usually cut out. The common method is a straight cut a little above the highest wet reading, so the cavity can dry and the repair is a clean strip of new board.

Plaster in pre-war buildings

Many pre-war buildings have plaster walls and ceilings on wood or metal lath. Plaster is heavier and harder than drywall and can come through a clean-water soaking well, as long as it stays bonded to the lath. Signs it has let go: it sounds hollow when tapped, it bulges or cracks in a spider pattern, or pieces crumble at the edges. Plaster dries more slowly than drywall, so expect the drying to take longer and ask for readings before anyone repaints.

Wood floors

Solid hardwood swells as it takes on water. Boards that cup, with edges higher than the middle, can sometimes flatten as they dry if the drying starts quickly. Boards that buckle up off the subfloor usually need replacing. Engineered wood and laminate are less forgiving: the core can swell and delaminate. Do not sand or refinish a floor until it reads dry, or the boards can move again afterwards.

Tile, vinyl and carpet

• Tile survives water well, but water can sit in the mortar bed or the subfloor below. Readings around the edges tell you.
• Vinyl sheet and plank can trap water underneath. If water has got under it, it often has to be lifted to dry the subfloor.
• Carpet pad soaked in anything but clean water is usually thrown out; the carpet itself can sometimes be cleaned and relaid after a clean-water leak.

If you see mold

EPA says that a moldy area smaller than about 10 square feet can in most cases be handled yourself, and New York City’s Health Department gives the steps: keep children and pets away, use soap and water on hard surfaces, wear waterproof gloves and dry completely. Mold inside a wall, or more than 10 square feet of it, is different, and in larger buildings city and state rules decide who may do the work. See mold remediation in NYC.

The order of the repair

1. Leak fixed and confirmed.
2. Wet materials mapped with a moisture meter.
3. What cannot be dried is removed.
4. Drying until the readings reach the dry target.
5. New board or plaster, tape and compound.
6. Stain-blocking primer, then paint; floors refinished or replaced last.

The whole sequence is on the page about water damage restoration in NYC. If the water came from above, see ceiling leak repair.

Questions people ask