If you're dealing with an old, torn vapor barrier from the original construction that's stopped doing anything, Arrow Tight Waterproofing's Vapor Barrier Installation specialists are ready to diagnose it right and fix it for good — not just patch the symptom.
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Our technicians assess your specific humidity source before recommending barrier thickness and coverage area.
Most residential installations are completed in a single day, minimizing disruption to the rest of your property.
Vapor barrier installation is quoted by your actual crawl space or basement square footage, given as a fixed price after an on-site measurement.
We install a minimum 20-mil reinforced polyethylene barrier, thick enough to resist tears from foot traffic or stored items — not the thin 6-mil sheeting that punctures within months.
Every Vapor Barrier Installation job starts with a real inspection — here's what that can include depending on what we find.
We lay a continuous 20-mil reinforced poly barrier across the entire crawl space floor, overlapping and taping every seam so there's no gap for ground moisture to migrate through.
Support piers, ductwork, and plumbing penetrations are individually wrapped and sealed rather than simply draped over, which is the most common point of failure in budget installations. That termination detail is what actually stops the stack-effect air movement, not just the flat coverage.
📞 Get a Free Quote →For basements being finished or re-floored, we install a vapor barrier beneath new flooring material to block moisture vapor transmission through the concrete slab before it reaches your new floor.
This step is essential before installing hardwood, laminate, or carpet in a below-grade space — skipping it is a leading cause of flooring failure in finished basements. We treat proper sealing as part of the install, not an optional add-on to save on material.
📞 Get a Free Quote →The vapor barrier is mechanically fastened and sealed at the foundation wall or sill plate termination point, closing the gap where most amateur installations leave the barrier loose and ineffective.
Proper termination is what actually stops the stack-effect air movement that pulls humid ground air into your living space. It's the part of the job that separates a real vapor barrier from plastic that just sits on the ground.
📞 Get a Free Quote →If you already have a vapor barrier that's simply failing at the seams, we can often correct and reseal the existing material rather than requiring a full tear-out and replacement.
We assess existing barrier condition honestly — if it's too degraded to salvage, we'll say so rather than patching something that will fail again. We treat proper sealing as part of the install, not an optional add-on to save on material.
📞 Get a Free Quote →For spaces with elevated humidity beyond what a barrier alone will resolve, we plan and quote a dehumidification unit alongside the barrier installation for complete moisture control.
We're upfront when a barrier alone won't be enough — the two work together, not as substitutes for each other. That termination detail is what actually stops the stack-effect air movement, not just the flat coverage.
📞 Get a Free Quote →Call +1-866-476-1348 and let us know whether you have an existing barrier that's failing or no barrier at all. That helps us scope the visit correctly.
Vapor barrier inspections in Marcus Hook are typically scheduled within days, with installation often completed the same visit for straightforward jobs.
The technician measures square footage, checks existing barrier condition if any, and quotes a fixed price for material and installation.
Once approved, we install and seal the barrier, then provide written warranty documentation covering the material and seams.
"Crawl space had literally nothing down there but dirt since the house was built in the 80s. New 20-mil barrier sealed up properly at the walls — floors upstairs noticeably less cold and damp within a couple weeks.Simple fix that made a real difference."
"Old vapor barrier was torn and bunched up in places, basically useless. They assessed it honestly and said a full replacement made more sense than patching — glad they didn't just charge us for a band-aid fix.Should have been done from day one."
"Installed a barrier under new flooring before we finished the basement. No moisture issues with the new floor at all since, which our contractor said is not always the case when people skip this step.Simple fix that made a real difference."
"Ductwork in the crawl space used to get condensation dripping off it constantly. After the barrier install sealed off the ground moisture, that stopped completely.Simple fix that made a real difference."
Arrow Tight Waterproofing provides Vapor Barrier Installation throughout Marcus Hook, PA, with regionally staged crews that keep response times short whether you're in Marcus Hook or a neighboring community.
