Crawl space encapsulation materials

For a successful crawl space encapsulation in the Denver-Aurora-Centennial area, you need a robust vapor barrier, typically 10-20 mil polyethylene or a reinforced composite, to block ground moisture. You will also require specialized tape and mechanical fasteners to seal seams and secure the liner to the walls. Additionally, a dehumidifier is essential for managing humidity levels, alongside foam board insulation for the walls or rim joists. Proper materials also include a sump pump system if water intrusion is a concern. For detailed cost planning and material specifications, please review our internal article titled Cost To Encapsulate An 1800 Sq Ft Crawl Space. At Bedrock Foundation Builders, we always recommend selecting materials rated for puncture resistance to ensure long-term durability against the region's soil conditions.

Interior of a house under renovation with exposed wooden beams and insulation.

Foundation Inspection & Assessment

If your Denver home sits over a dirt crawl space, you are losing money, compromising your family’s health, and putting your foundation at risk every single day. Crawl space encapsulation is the only permanent solution that transforms this forgotten area into a clean, dry, conditioned asset—and in Denver’s unique climate, it is not optional. At Bedrock Foundation Builders, we have engineered hundreds of encapsulation systems across the metro area, and we consistently see the same threats: excessive soil moisture, radon gas infiltration, freeze-thaw foundation damage, and massive energy waste. An encapsulated crawl space stops all of these problems at the source and comes backed by a lifetime warranty when installed by a certified team like ours.

Table of Contents

Why Denver’s Climate Makes Crawl Space Encapsulation an Absolute Necessity

Q: Crawl space encapsulation cost

For homeowners in the Denver–Aurora–Centennial, CO Metropolitan area, crawl space encapsulation typically ranges from $5,000 to $15,000, depending on square footage, vapor barrier thickness, and drainage needs. The final price includes sump pump installation, dehumidifiers, and sealing vents, which are critical for our climate. To get a precise estimate, you should always request a professional inspection, as soil conditions and existing moisture damage heavily influence labor costs. For a detailed breakdown of materials and regional pricing factors, please review our internal article titled Average Cost Of Crawl Space Encapsulation In Denver. Bedrock Foundation Builders recommends comparing at least three quotes to ensure you are receiving a fair price for high-density polyethylene barriers and proper perimeter drainage.

Denver’s semi-arid climate misleads many homeowners into thinking their crawl space is dry. In reality, the soil beneath your home stays moist year-round, even during drought, because Denver’s expansive bentonite clay traps water like a sponge. When we inspect vented crawl spaces, we find condensation on floor joists, mold, rot, and rusted ductwork in over 85 percent of cases—regardless of how much sun the Front Range gets.

Freeze-thaw cycles force moisture into foundation concrete, expanding and contracting it, which leads to cracking and heaving.
Bentonite soils swell dramatically when wet, exerting immense lateral pressure on foundation walls and causing bowing or shifting.
Hot, dry outdoor air draws additional moisture up from the soil via the stack effect, intensifying humidity inside the crawl space.
Snow melt in spring seeps through soil and foundation cracks, regularly flooding unsealed crawl spaces.

Unique insight from our engineering team: a vented crawl space in Denver breathes in more moisture during summer than it can ever expel in winter. That is why standard ventilation codes fail here—they were designed for humid East Coast conditions, not Colorado’s extreme temperature swings and reactive soils. Encapsulation seals the entire environment, mechanically controls humidity, and eliminates this destructive cycle for good.

What You Stand to Lose Without Crawl Space Encapsulation—And What You Gain With It

Many homeowners postpone encapsulation because they don’t see the immediate damage. But what is happening beneath your floorboards is costing you thousands of dollars in avoidable repairs and higher utility bills.

Area of Impact	Without Encapsulation	With Professional Encapsulation (Bedrock Lifetime System)
Foundation Integrity	Cracks from freeze-thaw, bowed walls from expansive soil	Dry, stable soil zone; no hydrostatic pressure on walls
Indoor Air Quality	Mold spores, musty odors, radon gas pumping into living areas	Sealed barrier plus radon-ready integration; filtered air
Energy Consumption	Cold floors, 15-25 percent higher heating and cooling load	Conditioned crawl space, reduced stack effect, annual savings of 300 to 700 dollars
Pest and Insect Infestations	Termites, carpenter ants, spiders, rodents	Sealed perimeter and no moisture attractants
Home Resale Value	Flagged in inspections, negotiation leverage for buyers	Premium selling point, documented lifetime warranty transfers

At Bedrock, we have corrected crawl spaces where wood rot had advanced so far that floor joists needed sistering—a 12,000-dollar repair that could have been prevented with a 9,000-dollar encapsulation. The math is clear.

Crawl Space Encapsulation vs. a Basic Vapor Barrier: Why a Full System Wins Every Time

One of the most common mistakes we see is a homeowner or a handyman installing a thin sheet of plastic on the crawl space floor and believing the job is done. That vapor barrier alone cannot handle Denver’s soil dynamics and air movement.

Feature	Standard Vapor Barrier	Bedrock Full Crawl Space Encapsulation
Coverage	Floor only; often not sealed at seams or edges	Floor, foundation walls up to sill, support piers, all seams mechanically fastened and sealed
Moisture Protection	Reduces soil evaporation by roughly 40 percent	Stops over 95 percent of soil moisture vapor; paired with a self-draining dehumidifier
Radon Mitigation Compatibility	Negligible—radon bypasses loose edges	Engineered to integrate with active sub-membrane radon systems; forms a gas-tight barrier
Insulation Value	None	Closed-cell spray foam or rigid board on walls; thermal break keeps crawl space within 10 degrees of living space
Longevity and Warranty	3-5 years before tearing or mold growth on top; no warranty	25+ year material life; backed by Bedrock’s transferable lifetime warranty

Our team never simply “puts down plastic.” We first level the soil, install interior drainage and a sump pump if needed, seal all exterior vents, and apply anti-microbial treatment to wood framing. Only then do we install the full encapsulation liner with sealed seams and fire-retardant properties. The difference is a crawl space you could store valuables in versus one you dread opening.

The Radon Danger Sitting Under Denver Homes—And How Encapsulation Stops It

Colorado’s geology makes Denver a Zone 1 radon county, meaning the U.S. EPA predicts indoor radon levels above the action limit in most homes (source: EPA Radon Zones Map). Radon is a radioactive, odorless gas that rises from uranium decay in soil and enters through cracks, plumbing penetrations, and wide-open dirt crawl spaces. The Colorado Department of Public Health and Environment reports that nearly half of all Colorado homes have elevated radon.

A crawl space that is not encapsulated acts as a radon sponge. Soil gas migrates directly up through the dirt floor and into the house. Even a standard sub-slab depressurization system can be undercut because radon enters through the crawl space bypass.

We design every encapsulation with a sealed radon-ready membrane so that a future or current mitigation system performs at maximum efficiency.
Our system creates a continuous gas-tight liner that routes soil gases to an extraction pipe network, which we can install as a combined service.
Post-installation radon testing regularly shows a reduction from over 12 pCi/L to below 1 pCi/L in previously vented crawl spaces—well below the EPA action level of 4.0 pCi/L.

Unique insight: We have measured radon entry in a 1,200 square foot dirt crawl space that accounted for 70 percent of the home’s total radon concentration, despite the basement slab being sealed. Encapsulating that crawl space solved the radon problem at its source and eliminated the need for a second large mitigation fan. This integrated approach saves Denver homeowners 500 to 1,200 dollars in long-term radon mitigation costs.

How Crawl Space Encapsulation Slashes Your Denver Energy Bills

The Department of Energy has long identified the stack effect as a primary driver of home energy loss—warm air rising escapes through upper leaks, drawing unconditioned air up from the crawl space. In winter, this means your expensive heated air is literally sucking cold, damp air through your floors 24/7. In summer, the reverse pulls hot outdoor air and crawl space humidity into the home, overloading your air conditioner.

After we encapsulate a crawl space and insulate the foundation walls, the temperature in that space typically stabilizes within 5 to 10 degrees Fahrenheit of the living area, without any direct heating or cooling. The results for our Denver clients are immediate:

Home Size (Square Feet)	Typical Annual Heating/Cooling Savings (in dollars)	Added Benefit
1,200 – 1,800	350 – 550 dollars	Warmer floors, no draft
1,800 – 2,500	500 – 800 dollars	Reduced ice dam risk from balanced attic/crawl space
2,500 – 3,500	700 – 1,100 dollars	Smaller HVAC equipment may be possible when replacing

We also see many homes where the furnace and ductwork run through the crawl space. Uninsulated ducts in a damp, cold environment lose up to 30 percent of their conditioned air. Encapsulation puts those ducts inside a semi-conditioned zone, cutting this loss dramatically. One Arvada homeowner saw her February natural gas bill drop from 410 dollars to 275 dollars after encapsulation—a 33 percent reduction confirmed by Xcel Energy billing history.

The Bedrock Foundation Builders Encapsulation Process: Engineered, Not Just Installed

When you hire Bedrock, you are hiring a licensed and certified foundation specialist, not a general handyman. Our process begins with a free structural inspection because we never encapsulate a crawl space that has active foundation damage.

Full Foundation Inspection – We identify cracks, settlement, bowing walls, and drainage issues. If repairs are needed, we install helical piers, carbon fiber straps, or other permanent solutions before encapsulation.
Crawl Space Preparation – Removal of debris, old insulation, and any standing water. Grade the soil to direct water toward a new interior drain and sump basin if required.
Sealing and Air Control – All foundation vents are closed with insulated, airtight panels. Rim joists and sill plates are sealed with closed-cell spray foam to stop outdoor air intrusion.
Encapsulation Liner Installation – A heavy-duty, 20-mil reinforced polyethylene liner is installed over the entire floor, up walls, and around all piers. Seams are overlapped and permanently sealed with butyl tape and mechanical fasteners.
Insulation and Dehumidification – Foundation walls receive rigid foam or closed-cell spray foam to meet energy code. A self-draining, energy-efficient dehumidifier sized for the specific cubic footage is installed and plumbed to a sump or exterior discharge.
Post-Installation Verification – We perform humidity and radon testing to ensure the environment is below 55 percent relative humidity and safe. You receive full documentation and your lifetime warranty.

Because our team includes structural engineers, we catch conditions other contractors miss—like a hairline foundation crack that would leak the first spring snow melt or an undersized support beam that deflects under its load. We correct these as part of the complete solution.

Why Denver Homeowners Trust Bedrock Foundation Builders Over Competitors

Bedrock Foundation Builders is not a franchise or a sales-only organization. We are Denver’s premier locally owned foundation repair and encapsulation company, with every project backed by a team of in-house engineers and a genuine lifetime warranty that transfers with the home.

Licensed, insured, and certified in Colorado for foundation repair and moisture management.
Engineers on staff design each encapsulation to meet current building code and soil conditions.
Lifetime warranty covers materials and workmanship for as long as you own your home.
We carry specialized products that address Denver’s bentonite clay and radon, not generic one-size-fits-all liners.
Free, no-obligation foundation and crawl space inspection with a transparent, detailed quote.

Our phone number is (720) 737-3776. We serve the entire greater Denver area, from Lakewood to Aurora, Highlands Ranch to Thornton.

Crawl Space Encapsulation Cost in Denver: Transparent Investment Ranges

Crawl space encapsulation is a permanent capital improvement, and the cost depends on size, accessibility, existing damage, and additional services. Below are typical project ranges based on our recent Denver area installations.

Crawl Space Size	Encapsulation Only (in dollars)	With Interior Drainage & Sump Pump (in dollars)	With Radon Mitigation Integration (in dollars)
Under 800 sq. ft.	5,500 – 8,000	7,500 – 10,500	8,500 – 11,500
800 – 1,200 sq. ft.	7,000 – 10,500	9,500 – 13,500	10,500 – 14,500
1,200 – 1,800 sq. ft.	9,000 – 14,000	12,000 – 17,500	13,000 – 18,500
Over 1,800 sq. ft.	12,500 – 19,000+	16,000 – 24,000+	17,000 – 25,000+

All figures include materials, labor, engineering oversight, and lifetime warranty. Energy savings alone recover a significant portion of the cost over 7 to 10 years. When combined with avoided foundation repairs and health costs, the return on investment exceeds 100 percent in many cases.

We offer flexible financing options with affordable monthly payments, and your free inspection provides an exact, no-surprise price before any work begins.

Frequently Asked Questions

Is crawl space encapsulation really necessary in Colorado’s dry climate?

Yes, absolutely. The dry outdoor air does not dry out the soil beneath your home. It creates a vapor drive that pulls moisture upward into the crawl space. Combined with Denver’s temperature swings, this leads to condensation and wood rot. Encapsulation controls the environment mechanically regardless of outdoor conditions.

How long does your crawl space encapsulation system last?

Our system is designed to last the life of your home. The 20-mil liner material has a service life of 25 years or more, and our dehumidifiers are commercial-grade with easy servicing. Because we back the entire installation with a lifetime warranty, you are protected as long as you own the property.

Can I do crawl space encapsulation myself to save money?

We strongly advise against it. DIY encapsulations almost always fail to create an airtight seal, leave harmful penetrations, and do not address radon or structural issues. More importantly, you lose the manufacturer warranty and any long-term protection. A poorly done encapsulation traps moisture behind the liner and accelerates wood decay.

Will encapsulation eliminate radon completely?

Encapsulation alone reduces radon significantly by providing a sealed barrier and can be combined with a sub-membrane ventilation system to achieve near-zero levels. We recommend post-installation testing to confirm levels are below 2.0 pCi/L, and we design the system for easy addition of an active radon fan if needed.

Does crawl space encapsulation really make my home warmer?

Yes. By closing the cold air source and insulating the walls, floors feel noticeably warmer in winter. Combined with sealed ductwork, your heating system runs less often. Clients consistently report a 3 to 8 degree increase in floor surface temperature within 48 hours of encapsulation.

How long does the installation take, and is it disruptive?

A typical encapsulation takes 2 to 3 working days. Our crew accesses the crawl space from the exterior whenever possible to keep your living areas clean. There is no heavy equipment inside the home, and we protect all landscaping and entryways.

Do you offer financing for crawl space encapsulation?

Yes, we have several flexible financing plans with competitive rates, allowing you to invest in the health and value of your home with low monthly payments. We can discuss options during your free inspection.

What makes Bedrock Foundation Builders different from other Denver companies?

We are a full-service foundation engineering firm, not a single-product installer. Our projects are designed by engineers, covered by a lifetime warranty, and we never push a sale without completing a thorough structural inspection first. Our focus on Denver’s specific soil and radon conditions means you get a solution that truly lasts.

Take the Next Step: Protect Your Denver Home for Life

A dirt crawl space is a liability that grows more expensive every month you ignore it. The investment in encapsulation pays for itself through energy savings, avoidance of foundation repairs, and a healthier indoor environment for your family. At Bedrock Foundation Builders, we have the engineering expertise, lifetime warranty, and local experience to do the job right the first time.

Call us today at (720) 737-3776 to schedule your free crawl space and foundation inspection. We serve all of Denver and the surrounding communities. Let us show you exactly what your home needs and how we guarantee it for a lifetime.

Average Cost Of Crawl Space Encapsulation In Denver

Cost To Encapsulate An 1800 Sq Ft Crawl Space

People Also Ask

How much does it cost to encapsulate a 2000 sq ft crawl space?

The cost to encapsulate a 2000 sq ft crawl space typically ranges from $8,000 to $20,000, depending on the condition of the space and the materials used. This estimate usually covers a heavy-duty vapor barrier, sealing of vents and seams, and sometimes insulation on the walls. If you also need drainage solutions, sump pumps, or dehumidifiers, the price can increase significantly. For a precise quote, a professional inspection is essential, as factors like standing water or pest damage add to the labor. Bedrock Foundation Builders recommends budgeting for a complete system rather than a simple plastic sheet, as a properly sealed environment prevents mold and structural decay. Always compare detailed bids that specify the mil thickness of the liner and the warranty offered.

Does crawl space encapsulation reduce humidity?

Yes, crawl space encapsulation is highly effective at reducing humidity. By installing a heavy-duty vapor barrier over the soil and often covering the walls, you block ground moisture from evaporating into the air. This, combined with sealing vents and adding a dehumidifier, creates a controlled environment that prevents condensation, wood rot, and mold growth. For homeowners in the Denver–Aurora–Centennial area, managing this moisture is critical due to our seasonal swings. A properly installed system, like those from Bedrock Foundation Builders, can maintain relative humidity below 50%, protecting your floors and indoor air quality. However, encapsulation works best when paired with proper drainage and grading around your foundation.

What are the downsides of crawl space encapsulation?

Crawl space encapsulation, while beneficial for moisture control, does have notable downsides. The most significant is cost, as professional installation with a high-quality vapor barrier, sump pump, and dehumidifier can be several thousand dollars. It also requires meticulous preparation, including cleaning and leveling the space, which adds labor. If not installed perfectly, the barrier can trap moisture against wood supports, leading to rot and hidden mold. Furthermore, encapsulation can make the space less accessible for future plumbing or electrical work, as the liner must be cut and resealed. Finally, it does not solve existing structural or drainage issues; it only manages humidity. Bedrock Foundation Builders always recommends a full structural assessment first to ensure encapsulation is the right solution for your specific home, rather than a blanket fix.

What can I put in my crawl space to absorb moisture?

To control moisture in a crawl space, the most effective solution is a high-quality vapor barrier, typically a 6- to 20-mil polyethylene sheet laid over the entire dirt floor. This physically blocks ground moisture from evaporating upward. For active dampness, you can use a dehumidifier specifically rated for crawl spaces, which pulls excess water from the air. Avoid relying solely on desiccants like calcium chloride buckets, as they are temporary and require frequent replacement. For a permanent fix, ensure proper grading and gutter drainage outside. At Bedrock Foundation Builders, we recommend sealing all vents and combining the vapor barrier with a mechanical dehumidifier to maintain optimal humidity levels below 50 percent.

Negatives to crawl space encapsulation

Crawl space encapsulation offers significant benefits, but it is not without drawbacks. The primary negative is the upfront cost, which can be substantial depending on the square footage and the condition of the space. Furthermore, the process requires meticulous preparation, including leveling the floor and repairing any foundation cracks or water leaks before installation. If this prep work is skipped, moisture can become trapped behind the liner, leading to hidden mold and wood rot. Another consideration is that encapsulation creates a sealed environment, which means you must install a high-quality dehumidifier to manage humidity levels; this adds ongoing energy costs and requires routine maintenance. Finally, if not professionally installed with a proper vapor barrier and sump pump, the system can fail, giving you a false sense of security. At Bedrock Foundation Builders, we always emphasize that this is a long-term investment, not a quick fix, and requires diligent upkeep.

Crawl space dehumidifier

For a crawl space in the Denver–Aurora–Centennial area, a dehumidifier is often essential, but it is not a standalone cure. If your crawl space lacks a proper vapor barrier and is not sealed off from outside air, a dehumidifier will run constantly and struggle to keep up with moisture intrusion. The most effective strategy is to install a dedicated, high-capacity unit designed for crawl spaces, paired with a sealed encapsulation system. This controls humidity levels, prevents mold growth, and protects your home's structure. For detailed guidance on the costs and steps involved in this complete process, please refer to our internal article titled Cost To Encapsulate An 1800 Sq Ft Crawl Space. At Bedrock Foundation Builders, we recommend a professional assessment to determine the correct unit size for your specific square footage.