Why is my crawl space wet if it hasn't rained?
On the coast, most crawl space moisture is airborne, not runoff. Warm humid air enters through the vents and condenses on cooler framing, ductwork and pipes - the same way a cold glass sweats. Add a shallow water table wicking moisture up through the dirt and the space never dries out on its own.
Isn't a vapor barrier enough?
A loose sheet of plastic over dirt slows ground evaporation and nothing else. Full encapsulation seals the floor and runs up the walls and piers, closes the vents, seals penetrations and adds dehumidification - that combination is what actually holds humidity down through a coastal summer.
Will encapsulation get rid of the musty smell?
Almost always, because the smell is microbial growth feeding on damp wood, and up to half the air upstairs is drawn from below. Remove the moisture and the source stops. Where growth is already heavy we clean and treat affected wood before sealing.
Do I need a dehumidifier in an encapsulated crawl space?
On this coast, nearly always. Sealing removes most of the moisture load, but a properly sized unit with a humidistat and drain line holds the space in range in August and after heavy rain. It appears as its own line item on your quote.
What does crawl space repair include?
Whatever the damage calls for. That usually means cutting out and replacing rotted sill plates and rim joists, sistering or replacing joists, replacing soft subfloor from below, treating mold on the framing, and replacing a torn barrier, soaked insulation or a failed sump. We also fix the moisture source, so the new wood stays dry.
How long does encapsulation take?
One to three days for most homes. Debris removal, drainage work or structural repairs can add a day. You'll have the schedule in writing before we start, and you can stay in the house the whole time.
Should crawl space vents be open or closed in summer?
On this coast, open vents let in humid summer air that condenses on cooler framing and ductwork, so they don't dry a crawl space out in July and August. Closing them only helps once the space is sealed and dried, with a dehumidifier holding the humidity down. In a FEMA flood zone the flood openings have to stay, so check before closing any vent.
Do gutters matter if my crawl space is sealed?
Yes. Roof water dumped at the foundation soaks the sand next to the footing and works its way under the house, sealed or not. Clean gutters and downspouts that discharge well away from the house take load off the drainage, the sump and the dehumidifier.