Question 1

What is the difference between open-cell and closed-cell spray foam insulation?

Accepted Answer

Closed-cell spray foam has a dense, rigid structure with an R-value of approximately R-6 to R-7 per inch. It acts as both an air barrier and a vapor retarder, making it ideal for roof decks, crawlspaces, rim joists, and exterior walls in cold climates like Durango. Open-cell spray foam is softer and less dense, with an R-value of approximately R-3.5 to R-4 per inch. It is better suited for interior applications like soundproofing walls and attic floors. For Durango's IECC Climate Zone 5B and its cold winters, closed-cell is typically the recommended choice for maximum thermal performance.

Question 2

How much does spray foam insulation cost in Durango, CO?

Accepted Answer

Spray foam insulation costs in Durango typically range from $1.50 to $3.50 per square foot for open-cell foam and $3.00 to $6.00 per square foot for closed-cell foam, depending on thickness and application complexity. A typical residential attic project runs $1,500–$4,000. However, when you factor in LPEA rebates (up to $1,500/year standard, $3,000 income-qualified), the Colorado HEAR program (up to $1,600 for insulation), and EnergySmart Colorado incentives (up to $2,000), your net out-of-pocket cost can be significantly reduced. Call (970) 903-0768 for a free site-specific quote.

Question 3

What R-value do I need for my attic in Durango, CO?

Accepted Answer

Durango is in IECC Climate Zone 5B. The 2021 IECC (which Colorado has adopted) requires a minimum of R-49 for attic and ceiling insulation — though many building scientists recommend R-60 for optimal performance at Durango's elevation of 6,512 feet. If your home has less than R-30 in the attic (common in pre-1990 homes), upgrading to R-49 or R-60 is typically one of the highest-ROI improvements you can make.

Question 4

What is ACH50 and why does it matter?

Accepted Answer

ACH50 stands for Air Changes per Hour at 50 Pascals — a measurement of how airtight your home is. A blower door test depressurizes your home to 50 Pascals of pressure, then measures how much air leaks in per hour. The 2021 IECC requires new construction to achieve 3.0 ACH50 or better. A typical older Durango home might test at 8–15 ACH50, meaning its entire air volume is exchanged every 4–8 minutes — bleeding heated air out constantly. Proper air sealing and insulation can cut this dramatically, reducing heating bills and improving comfort.

Question 5

How does a blower door test work?

Accepted Answer

A blower door is a powerful fan mounted in an exterior doorway with a pressure gauge. The fan depressurizes your home to a standard 50 Pascals below outdoor pressure. At that pressure, every crack, gap, and unsealed penetration in your building envelope allows outside air in. We measure the total airflow required to maintain 50 Pa — expressed as CFM50 (cubic feet per minute) — and convert that to ACH50. We then use thermal imaging simultaneously to locate exactly where the leaks are. The entire test takes about 30–60 minutes and gives us a complete air-sealing map of your home.

Question 6

What causes ice dams and how does spray foam prevent them?

Accepted Answer

Ice dams form when warm air from inside your home escapes through the attic floor, warms the roof deck, and melts the underside of accumulated snow. That meltwater flows down to the cold eave overhang where it refreezes, forming a dam. Water then backs up under shingles and into your ceiling and walls. The solution is not a roof product — it's eliminating the heat source: air sealing every attic penetration (top plates, recessed lights, HVAC chases, plumbing stacks) followed by insulation to R-49 or R-60. This stops warm air escape entirely, so the roof stays uniformly cold and snow melts naturally.

Question 7

How long does spray foam insulation last?

Accepted Answer

Properly installed closed-cell and open-cell spray foam insulation is considered a permanent installation with an indefinite lifespan. Closed-cell foam does not settle, compress, or absorb moisture, and maintains its R-value for the life of the building — typically 50+ years. Unlike fiberglass batts, which can sag, compress, or become contaminated with moisture, spray foam adheres directly to the substrate and becomes part of the building structure.

Question 8

Is spray foam insulation safe for my family?

Accepted Answer

Once fully cured (typically 24 hours after installation), spray foam insulation is inert and non-toxic. During installation, our crews wear appropriate PPE and the space must be ventilated and vacated. After the 24-hour curing window, the foam is safe for occupancy. We use low-VOC formulations where possible. The finished product does not off-gas and does not release particles into the air. Spray foam also does not provide a food source for mold or pests.

Question 9

Are there rebates for insulation upgrades in Colorado?

Accepted Answer

Yes — multiple programs stack in Durango: (1) LPEA (La Plata Electric Association) offers up to $1,500/year standard or $3,000/year income-qualified in member rebates. (2) The Colorado HEAR program (Home Electrification and Appliance Rebates, launched November 2025) provides up to $1,600 for insulation and air sealing. (3) EnergySmart Colorado via 4CORE offers up to $2,000 for weatherization improvements plus a $150 LPEA rebate after your first measure is installed. Durango city residents who are Atmos Energy customers also qualify for a FREE home energy assessment through the City/LPEA/4CORE partnership. Income-qualified households can receive 100% of costs covered through the Colorado Weatherization Assistance Program.

Question 10

What is the difference between spray foam and blown-in insulation?

Accepted Answer

Spray foam (both open and closed-cell) expands to fill cavities and creates an air seal — it does not just add R-value, it also stops air movement through the building envelope. Blown-in insulation (cellulose or fiberglass) fills cavities and adds R-value but does not create an air barrier on its own. For maximum performance, especially in Durango's climate, spray foam is preferred for air-critical locations (rim joists, roof decks, crawlspaces). Blown-in cellulose is an excellent, cost-effective choice for topping up attic floors in retrofit projects where the air sealing has already been done.

Question 11

How long does spray foam installation take?

Accepted Answer

Most residential spray foam projects take 1–2 days, depending on scope. A standard attic air sealing and insulation project can typically be completed in a single day. Larger projects — whole-house air sealing, commercial metal buildings, or multi-zone applications — may take 2–3 days. The foam requires a 24-hour curing window before the space is reoccupied. We'll give you a specific timeline as part of your free quote.

Question 12

Can spray foam be applied in an existing home or only new construction?

Accepted Answer

Spray foam is effective in both new construction and existing homes. In existing homes, we commonly apply closed-cell foam to accessible crawlspaces, rim joists, basement walls, attic eaves, and roof decks. For enclosed wall cavities in existing homes without demolition, blown-in dense-pack cellulose or fiberglass is typically more practical. If walls are being opened for renovation, spray foam is an excellent option. We assess your specific situation and recommend the right product for each application.

Question 13

Does spray foam help with soundproofing?

Accepted Answer

Open-cell spray foam is an effective sound dampener due to its soft, sponge-like structure — it absorbs sound waves and reduces sound transmission between rooms and from outside. Closed-cell foam is denser and provides less sound absorption, though it still reduces airborne sound transmission. If soundproofing is a primary goal, open-cell foam in interior wall cavities combined with other acoustic treatments is the most effective approach.

Question 14

What areas do you serve from Durango?

Accepted Answer

From our location at 28146 US-160, we serve all of La Plata, Montezuma, and Archuleta counties — including Durango, Bayfield, Cortez, Mancos, Ignacio, Pagosa Springs, Hesperus, Bondad, and the Purgatory Resort corridor along US-550. We also serve Dolores, Telluride area, and parts of the Four Corners region. Call (970) 903-0768 to confirm your area.

Question 15

Do you work with the Three Springs development requirements?

Accepted Answer

Yes. Three Springs — the master-planned traditional neighborhood development on US-160 — requires all builders to achieve a HERS score of 90 or lower, verified by a third-party rater. Our insulation and air sealing work is designed to meet and exceed these requirements. We are familiar with Three Springs' builder requirements and can coordinate directly with your builder's HERS rater to ensure your home passes inspection.

Question 16

Do you offer a warranty on your work?

Accepted Answer

Yes. We stand behind every installation. The spray foam products we use carry manufacturer warranties on material performance. Our workmanship is guaranteed — if any installed area fails to perform due to our installation, we will return and correct it at no charge. We also provide post-installation blower door testing on new construction projects to verify that air sealing meets the specified ACH50 target.

Spray Foam Insulation FAQs — Durango, CO

Common Insulation Questions Answered

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