Crawl Space Wet After Rain

It rains, and the crawl space is wet. Maybe you see it at the hatch, maybe the rooms smell the next day, maybe a contractor showed you a photo. Rain is the clue you can use. Water that shows up with storms is coming from the storm until a pipe proves otherwise. A pipe leak is wet on sunny days too. A rain-only wet space points outside.

Walk outside in the rain if you can do it safely, no lightning, no slick roofs. Watch each downspout. Water should leave the foundation, not firehose the soil at the wall. Watch gutters that spill over. Watch window wells and any low door into the crawl space. A well that fills will pour in. A hatch cover that leaks will too. These are visible. Photograph them while they are happening. Dry weather makes everyone forget the path.

From the hatch after the storm, look without crawling into a pond. Where is the water relative to the wet wall outside? A match is a strong hint. Standing water around a pier, a stream along one side, ducts dragging in it. If you see that, the repair is drainage and maybe a sump or grading, designed by someone who does it, not a bag of absorber. Get out if the space is tight, electrified in a sketchy way, or you cannot see your exit.

Do not lay plastic over the flood and call it handled. Do not run a box fan from the crawl into the living room. Do not close vents in a panic during the storm. Change the water's route, then talk about covers and ventilation with someone who can see this house.

The smell upstairs the day after rain fits this pattern. Note it. If the smell also happens with no rain when the AC starts, you have a second pattern. Both can be true. The notebook keeps the crawl space rain from eating the whole diagnosis.

Pipes still matter if the "rain" wet spot is under a bath and the weather was fine. Look at the timing before you dig the yard. Timing is free.

Soft wood after repeated wetting is a pro's inspection, not a smell candle. Say how often it floods. "Every hard rain at the north wall" is a work order.

Compare two storms before you sign a big dig. If both wet the same wall and the spout on that wall is short, extend the spout and watch the third storm. If the wall stays dry, you just avoided a complicated job. If it floods anyway, you bring the photos and the spout note to the person who designs the drainage. You tried the obvious fix.

Keep the hatch closed between looks so the wet air is not pouring into a closet. Closing it is not the repair. It is manners while you wait for the next rain to teach you something. Mark the date of each look so the photos tell a sequence.

If water reaches ducts or a furnace in that space, turn off what you safely can and call a technician. Equipment sitting in a puddle is no longer a smell article. It is a repair with a safety edge. Do not wade in to rescue a filter.

If you cannot be home during the storm, ask someone to look at one spout, or set a dry towel at the hatch edge and check it when you return. A wet towel with a date is still evidence. A memory of the smell the next day is weaker than the towel.

This is a house check, not a diagnosis. Symptoms go to a doctor, and big wet repairs go to a licensed pro.

Rain and the hatch are in the ClearNest picture guide When Your House Doesn't Feel Right. $2.99 at https://clearnestair.com/book.