A vented, dirt-floor crawl space pulls in humid air all summer and stays damp all winter — encapsulation seals that cycle off completely and it usually shows up on your energy bill within a season.
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Four commitments that separate a properly trained crawl space encapsulation crew from a generalist showing up with a truck and a hope.
Our crews are trained in building science fundamentals — stack effect, dew point, vapor drive — not just liner installation.
Most Gaithersburg, MD service areas can get an inspection scheduled within a day or two of your call.
You'll see a line-item breakdown covering liner, sealing tape, vent covers, and dehumidifier if one is recommended.
Seams are heat-taped or mechanically sealed, and liners are run up piers and foundation walls, not just laid flat on the dirt floor.
Each service below is scoped specifically to crawl space encapsulation, not a generic waterproofing menu with the name swapped in.
A complete encapsulation seals the dirt floor, foundation walls, and piers with heavy-gauge reinforced polyethylene, cutting off the ground moisture that feeds humidity, mold, and wood rot. This is the baseline fix for most crawl spaces showing chronic humidity above 60%.
We seal vents with rigid foam or vent covers as part of a full encapsulation, converting the space to a conditioned, sealed environment.
Even a fully encapsulated crawl space can hold residual moisture from concrete curing, plumbing condensation, or seasonal humidity swings. Units include a humidistat so the system only runs when actually needed, not continuously.
Crawl spaces with a history of standing water need drainage addressed before encapsulation, or the liner just traps water underneath itself.
Every encapsulation project includes a joist and subfloor inspection, and we flag any structural concerns before sealing the space, not after.
Here's the exact path from your call to a finished encapsulation.
A quick phone triage helps us bring the right liner mil-thickness and dehumidifier sizing information to the first visit.
You'll get a text confirmation with an arrival window before the technician heads out.
You'll see photos of any wood rot, mold growth, or standing water documented before the quote is finalized.
The space isn't considered complete until relative humidity readings confirm the system is holding at target levels, not just until the liner is down.
Real feedback from Gaithersburg-area customers who called us for crawl space encapsulation.
"The musty smell that used to reach our upstairs bedrooms is completely gone since they encapsulated the crawl space."
"They showed us the mold on the joists with a camera before we ever agreed to anything — appreciated the transparency."
"Dehumidifier they installed keeps the readout right around 45% humidity year-round now. Huge difference from before."
"Sump basin they added handled a heavy rain last month without a drop making it under the new liner."
The questions Gaithersburg customers ask us before booking crawl space encapsulation service.
Arrow Tight Waterproofing provides crawl space encapsulation throughout Gaithersburg, MD, dispatching from regional staging points to keep arrival times short across our full coverage footprint.
Our encapsulation coverage area grows as we add regional crews, so a past 'outside our area' answer may no longer be accurate.
Notice: Arrow Tight Waterproofing is a free referral service designed to assist homeowners and businesses in connecting with independent local contractors. All contractors and service technicians are independent and Arrow Tight Waterproofing does not warrant or guarantee any work performed. It is the responsibility of the customer to verify that the hired contractor furnishes the necessary license and insurance required for the work being performed. All calls are routed to independent local service providers.
