What Things Could Be Producing an Acetone Smell in the Walls of My House?

Caulk

• Caulk and silicone-based sealants can have a distinctively acetone or vinegar smell. These odors can linger for some time. If the wall with the odor in question is in a bathroom or kitchen, and you have recently sealed around a tub, sink, or toilet, this is one potential source for the odor. Consider placing a fan in the area and opening doors and windows to air out the room.

Mold and Mildew

• A prolonged leak behind a wall can lead to mold and mildew growth. One reason household mold is dangerous is because many varieties give off chemicals as they grow and spread. These chemicals can take on a number of odors, from rotten eggs to acetone. If you suspect you have had a leak in your wall, have your house inspected for mold and water damage.

Sewer Gas

• A dry drain trap in your basement or a cracked sewer pipe in your crawl space can allow sewer gas to escape up into your home's walls. The odor may permeate the walls easier than the floor and thus seem to emanate from them. Check for the odor, and look at your sewer and drain pipes for signs of cracks or leaks. If your drain trap is dry due to not being used, simply pouring water down the drain can refill the trap and seal off sewer gas.

Electrical Wire Issues

• A less likely, but still possible, source is an electrical issue. When wires short circuit inside walls, they can burn plastic in junction boxes, rubber coatings on the wires themselves and even insulation. These issues can produce a range of chemical smells that may include acetone. If you suspect an electrical issue, shut off your circuit breaker and contact the local fire department to see if they offer free inspections.