A faucet that drips is annoying. A faucet that drips into a cabinet, a wall or a joist is a mold problem with a start date. The EPA's guidance for homeowners is direct about the timing: mold will grow on damp materials within 24 to 48 hours, and the only way to stop it is to fix the water problem. Everything else, including every cleaner on the shelf, is cleanup after the fact.
The leaks that cause trouble are the quiet ones
A faucet dripping into a sink does no damage. The ones that matter are the leaks that land on something absorbent and stay there:
- the supply line or the trap under a kitchen or bathroom sink, soaking the cabinet floor;
- a toilet that weeps at the base or at the tank bolts onto the subfloor;
- a shower valve or a tub spout leaking behind tile, where nothing shows until the wall below goes soft;
- a washing machine hose at the connection, usually found when the pan under the machine finally overflows;
- a slow drip at a joint in the basement ceiling, onto a joist.
Drywall, plaster, wood, insulation, cardboard, dust and the paper facing on insulation are all food for mold once they are wet. Tile and glass are not, which is why a bathroom can look clean and still smell musty.
Finding one you cannot see
- Follow your nose. A musty smell in one room, one cabinet or one closet is worth chasing. Mold has a smell long before it has a visible patch.
- Read the water meter. Turn off every fixture and appliance in the house, note the meter reading, and come back in an hour or two. Movement means water is going somewhere. The Philadelphia Water Department explains the meter and how to use it on its own site.
- Look low. Cabinet floors, baseboards and the first few inches of drywall show it first. Press gently. Soft, spongy or stained material is the end of a trail.
- Check the ceiling below a bathroom. Our post on finding the source of a water stain on a ceiling walks through that one in detail.
Fix the water first, then clean
The order matters. Cleaning mold while the material is still getting wet buys you a few weeks at best. Fix or shut off the leak, dry the area out, and only then clean.
For cleanup, the EPA draws a practical line in its mold cleanup guide: if the moldy area is less than about 10 square feet, roughly a three-foot by three-foot patch, a homeowner can usually handle it. Beyond that, or where mold came from sewage or badly contaminated water, it recommends getting a professional involved. A few more points from the same guidance that are easy to get wrong:
- Absorbent or porous materials such as ceiling tiles and carpet may have to be thrown out. Mold grows into the material, and the surface cannot be made clean again.
- Do not paint or caulk over mold. The paint will peel and the problem continues underneath.
- Dry everything completely within 24 to 48 hours of getting wet, which in practice means fans, open cabinets and a dehumidifier, not just wiping.
- Protect yourself: gloves, eye protection, and an N-95 respirator for anything more than a wipe-down.
Testing is usually not the first step. The EPA's position is that if you can see or smell mold, you already know you have a moisture problem, and sampling will not change what you do about it.
Keep the house dry the rest of the year
Philadelphia summers are humid and the winter brings condensation on cold surfaces, so some of this is seasonal rather than plumbing.
- Keep indoor humidity under 60 percent. A cheap hygrometer tells you where you stand; a dehumidifier in the basement does the work.
- Run the bathroom fan during a shower and for a while after, and make sure it vents outside, not into the attic.
- Vent the clothes dryer outside and keep the duct clear. Our post on dryer vent cleaning covers the fire side of that, but the moisture side matters too.
- Deal with gutters and grading. Most basement damp in a rowhome starts outside with water that was never sent away from the wall.
When to call a plumber instead
Call someone if the leak is inside a wall or under a slab, if the shut-off valve under the fixture does not hold, if you are looking at a supply line rather than a drain, or if the material around it is already soft. Those are not patch jobs, and the longer the material stays wet the more of it has to come out.
To get more than one opinion, describe the job once and compare estimates from plumbers serving Philadelphia. Before you pick anyone, check the contractor: license, insurance, and a written scope that says what is being opened up and what is being put back.
HomeKept is a brand of FalconAI LLC, 331 E Street Rd, Feasterville-Trevose, PA 19053.
HomeKept needs JavaScript. Please enable it and reload the page. ·
HomeKept necesita JavaScript. Actívalo y vuelve a cargar la página. ·
Для работы HomeKept нужен JavaScript. Включите его и обновите страницу.