What is a crawl space vapor barrier and what does it do?

A vapor barrier is a heavy polyethylene sheet laid over the crawl space floor, and often up the foundation walls, that blocks ground moisture from evaporating into the space above. It keeps the wood framing and sub-floor insulation dry, reduces musty air rising into the home, and makes the crawl space less inviting to pests. AtticGuard installs it so the seams and edges actually seal rather than just cover the dirt.

Do I need a vapor barrier in San Diego's dry climate?

Usually yes, because the soil releases moisture regardless of the weather above ground, and San Diego adds the coastal marine layer, landscape irrigation, and the vented crawl spaces common in older homes. Those conditions keep many crawl spaces more humid than owners expect. A free inspection shows whether the crawl space is holding moisture and whether a barrier is warranted.

What is the difference between a vapor barrier and full encapsulation?

A standard vapor barrier covers the crawl space floor to block ground moisture, which handles the main source for most homes. Full encapsulation seals the floor and the foundation walls into one closed envelope with taped seams and sometimes a dehumidifier, for crawl spaces with heavier moisture problems. AtticGuard recommends the level that matches what the inspection finds, and scheduling starts at +1 (858) 330-6197.

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