Crawlspace Repair
Encapsulation
Turn a damp, dirt crawlspace into a dry, sealed space.
Encapsulation covers the ground and foundation walls with a sealed liner, closes off outside vents and manages humidity so moisture stops rising into your floors and living space.
What crawlspace encapsulation is
A typical vented crawlspace lets humid outdoor air in during the summer. That air meets cooler surfaces under the house and condenses, keeping wood framing damp. Bare soil adds even more moisture. Encapsulation separates the crawlspace from both sources.
A full system usually includes a durable liner across the floor and up the walls, sealed seams and penetrations, sealed vents and access doors, and a way to control humidity, commonly a crawlspace dehumidifier or a conditioned air supply. Any standing water problem should be fixed with drainage first, because a liner is not designed to hold back flowing water.
Signs your crawlspace needs moisture control
You may notice these from inside the house before anyone looks underneath.
Musty odors in the living space
Air from the crawlspace moves up into the home, carrying humidity and odors with it.
Condensation on ductwork or pipes
Sweating ducts and pipes under the house are a sign of high crawlspace humidity.
Sagging fiberglass insulation
Insulation that absorbs moisture gets heavy and drops out of the floor joists.
Pests and insects
Damp crawlspaces attract termites, crickets, rodents and other pests.
Cupping hardwood floors
Moisture rising from below can make wood flooring swell and cup.
How encapsulation is installed
A proper installation is mostly preparation and sealing. The liner is only one part.
Inspect and measure moisture
The crawlspace is checked for standing water, wood moisture, mold, damaged framing and drainage problems.
Fix water and structural issues first
Drainage, sump pumps, mold cleanup or structural support are handled before sealing, so problems are not hidden under the liner.
Clean and prepare
Debris, old vapor barrier and failed insulation are removed, and the ground is leveled where needed.
Install and seal the liner
The liner is laid across the floor, run up the walls and piers, and taped and sealed at seams and edges.
Seal vents and control humidity
Vents and the access door are sealed, and a dehumidifier or conditioned air supply is set up and tested.
Every property is different. The exact scope is set after an on-site assessment.
Good to know
Local codes apply
Closing crawlspace vents changes how the space is treated under building codes. Requirements vary by jurisdiction and are confirmed during planning.
Combustion appliances need attention
If a furnace or water heater in the crawlspace draws combustion air from it, that has to be addressed before sealing.
One call, every trade, start to finish
Crawlspace problems rarely have a single cause. Drainage, moisture control and the framing above it all need to be handled in the right order.
One point of contact
You work with one coordinator instead of tracking down separate contractors for each part of the job.
Every trade the job needs
Restoration rarely stops at one trade. Follow-on work like drywall, flooring, electrical or roofing can run through the same request.
Local professionals
We connect homeowners with service professionals in our network across Illinois, Missouri, Kentucky and Indiana.
Records you can share
Photos and written scopes from the job can be shared with your insurer at your discretion. We are not affiliated with any insurance company and do not make coverage decisions.
Encapsulation FAQs
Related services
Vapor Barriers
Ground covers that limit moisture rising from crawlspace soil.
Drainage Systems
Getting standing water out of the crawlspace and keeping it out.
Mold Cleanup
Cleaning mold off crawlspace framing before the space is sealed or repaired.
Find out if encapsulation is right for your crawlspace
Tell us what you are noticing in the house. A local professional can inspect the crawlspace and recommend a scope.
Call +1 (618) 925-0085Filling out the form
Under Services, choose Crawlspace Repair, then select Encapsulation.
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