Before hiring a company for crawlspace encapsulation or moisture work, ask six things: the vapor barrier's thickness (in mils) and warranty, whether the quote includes dehumidification, how the seams and penetrations will be sealed, whether they're fixing the actual source of the moisture or just covering it, and what their inspection process looks like. A detailed, specific quote tailored to your crawlspace is a good sign โ a vague, one-size-fits-all package is worth questioning.
Crawlspace work is one of those projects that's genuinely hard to evaluate as a homeowner โ it's out of sight, technical, and quotes can vary a lot without an obvious reason why. Here are the questions worth asking before you commit to anyone.
"What thickness vapor barrier are you using?"
Vapor barrier thickness genuinely affects how well an encapsulation holds up over the years. A specific answer, measured in mils, is a good sign; a vague "heavy-duty plastic" answer is worth pressing on. The vapor barrier is the centerpiece of the whole system, so this isn't a detail to gloss over.
"Is dehumidification included, or is that separate?"
A proper encapsulation typically includes both sealing the space and controlling the humidity within it โ usually with a dedicated dehumidifier. If a quote only covers sealing with no humidity-control plan, ask why: a sealed space still needs its residual moisture actively managed, or you can trap dampness inside rather than solve it.
"How are the seams and penetrations sealed?"
The vapor barrier is only as good as its weakest point. Ask specifically how the seams between sheets, and any pipes or posts passing through the barrier, will be sealed โ not just whether a barrier will be "installed."
"Are you addressing the actual cause of the moisture, or just covering it up?"
If your crawlspace has real water intrusion โ not just humidity โ ask whether the quote includes addressing the source, like grading or drainage, or whether it's just sealing over an unresolved water problem. As we cover in our breakdown of what encapsulation actually includes, sealing alone doesn't fix active water intrusion โ it just gives that water a sealed container to sit in.
"What does your inspection process actually look like?"
A company that walks you through what they found โ specific signs of moisture, where, and why โ before recommending a solution is giving you an assessment. A company that quotes a standard "encapsulation package" without ever really looking at your specific crawlspace is giving you a guess.
"What's the warranty on the work?"
Ask specifically what's covered, for how long, and what would void it. How confidently a company answers this tells you a lot about how much they trust their own installation.
Why These Questions Matter
Crawlspace work is largely invisible once it's done โ you're trusting that what's underneath your home was actually done correctly, since you're unlikely to crawl under there and check regularly yourself. Asking specific, detailed questions upfront, and paying attention to how specifically (or vaguely) they're answered, is one of the best ways to gauge whether you're getting a real, tailored assessment or a generic sales package.
A Good Sign vs. a Concerning Sign
A company that answers these questions specifically, walks your actual crawlspace before quoting, and explains its reasoning is generally a good sign. A quote that arrives without anyone really inspecting your space โ or answers that stay vague when you ask for detail โ is worth a second opinion.
Ask Us Every One of These Questions
If you're evaluating crawlspace work, call Perfect Service at 205-206-6091 or contact us online and ask us every one of these questions. We'd rather earn your trust with specific, honest answers about your particular crawlspace than hand you a vague sales pitch.
Common Questions About Hiring for Crawlspace Work
Itโs generally a good idea for any significant home project, and it gives you a chance to compare not just price but how specifically each company answers questions like these.
Not necessarily, but a significantly cheaper quote is worth scrutinizing closely against these same questions โ sometimes it reflects thinner materials or missing components like dehumidification.
A real inspection should result in specific findings about your home โ where moisture is coming from, what condition things are in โ rather than a generic recommendation that could apply to any home.
Thatโs worth taking seriously as a signal. A company confident in their work should be able to explain their materials and process in specific, understandable terms.
Sometimes a smaller, targeted fix genuinely is all a crawlspace needs, and thatโs a legitimate lower-cost answer โ the key is that it comes from an honest assessment, not just being the lowest number on a page.
