Insulation in Covina, CA
Crawl space encapsulation and vapor barrier installation in Covina typically runs $3,500-$8,500 for a full encapsulation, with most homeowners seeing 15-30% reductions in cooling costs during the San Gabriel Valley’s brutal summer heat. We’re Envelope Insulation Co., and we treat air sealing as a hard prerequisite before any insulation goes in - blower-door numbers prove it. Call (562) 242-7569 for a written price before any work starts.
Why Covina Homes Are Different
Covina sits deep in the San Gabriel Valley heat pocket, where summer temperatures routinely hit 100-108°F - a full 25-30°F hotter than the LA coast just 25 miles west - yet the city’s housing stock is dominated by pre-1978 tract homes built before California’s Title 24 energy codes mandated meaningful insulation standards. This creates an unusually urgent and concentrated market: homes engineered for a mild climate, baking in one of the hottest inland microclimates in Los Angeles County, with original insulation that is now 50-70 years old.
The San Gabriel Mountains to the north form a geographic bowl that traps heat over Covina, and the city experiences almost no marine layer influence unlike communities closer to the coast - meaning attic spaces in summer routinely exceed 150°F, placing extreme thermal load on ceilings and accelerating degradation of older insulation materials. The valley also sees notable diurnal swings in fall and winter, increasing the value of both attic and wall insulation for year-round comfort, not just summer cooling.
Contractors working Covina’s older neighborhoods - especially the blocks east of Citrus Avenue and around the historic downtown core - frequently find that previous “insulation upgrades” consisted of a thin layer of blown cellulose added over flattened original fiberglass batts, creating dead air pockets and moisture traps rather than real R-value; pulling permits for attic work here regularly reveals this layered, patchwork condition unique to homes that changed hands multiple times during the 1980s-90s flipping era.
Our Main Covina Services
Most Covina homeowners who call us start with attic work or spray foam, but blown-in remains the workhorse for retrofitting older San Gabriel Valley homes. Here’s where each fits.
Attic Insulation in Covina
Attic insulation in Covina means dealing with 150°F summer attic temperatures and original R-11 batts that have settled to half their labeled thickness. We remove the compromised material, seal every penetration with expanding foam and caulk, then install fresh insulation to current Title 24 standards. Every attic job gets a blower-door test before and after, with the numbers published in your job record. Attic Insulation in Covina covers full project details and pricing.
Spray Foam Insulation in Covina
Spray foam insulation in Covina makes particular sense for the 1950s-1960s ranch homes with complex rooflines and limited attic access - the kind common north of Badillo Street. Closed-cell foam at R-6.5 per inch packs maximum R-value into shallow cavities, and it doubles as an air barrier, which matters when your attic is functionally a solar oven six months a year. We source our foam from Icynene and Demilec, with no proprietary lock-in. Spray Foam Insulation in Covina breaks down open-cell versus closed-cell applications.
Blown-In Insulation in Covina
Blown-in insulation in Covina is the standard retrofit for adding R-value over existing but settled material, but we never blow over an unsealed attic floor - that’s Haven Standard Clause 1 in action. The San Gabriel Valley’s temperature swings mean air movement through the ceiling plane costs you money in both seasons. We use GreenFiber cellulose and Owens Corning fiberglass, selected by attic condition and homeowner preference, always over a completed air-sealing layer. Blown-In Insulation in Covina explains material selection and installation process.
What happens when you call
- 1
A real person answersNo phone trees - you reach a local pro.
- 2
You get an upfront price rangeHonest numbers before anyone is dispatched.
- 3
A background-checked tech heads outLicensed & insured, dispatched right away.
- 4
You approve before work beginsNothing starts until you say go.
Before
AfterCrawl Space Encapsulation & Vapor Barrier in Covina
Covina’s pre-1978 tract homes were built with vented crawl spaces designed for a cooler, drier climate than the San Gabriel Valley delivers. Summer heat drives moisture through dirt floors and perimeter vents, while winter rains saturate the clay-heavy soils common east of Citrus Avenue. The result is chronically damp crawl spaces that rot floor joists, breed mold, and pump musty air into living spaces through the stack effect. Crawl Space Encapsulation & Vapor Barrier is our systematic response: seal the ground, seal the walls, condition the air, and document the before-and-after humidity readings.
Crawl Space Vapor Barrier
Signs you need it
Your crawl space has standing water after rain, white mineral deposits (efflorescence) on block walls, or floor insulation that sags and drips in summer.
What it costs in Covina
A 6-mil to 20-mil vapor barrier installed over bare dirt in a typical Covina crawl space runs $1,200-$2,800, with thicker mil ratings and seam sealing at the higher end.
How we do it
We remove debris and old fallen insulation, grade the soil for drainage, lay overlapping polyethylene sheets with sealed seams, and extend the barrier 6-12 inches up pier posts and walls before fastening.
Crawl Space Encapsulation
Signs you need it
You smell mustiness indoors in humid months, your hardwood floors cup or crown seasonally, or your HVAC ducts in the crawl space show corrosion or mold.
What it costs in Covina
Full encapsulation with sealed vapor barrier, wall insulation, sealed vents, and dehumidification for a typical Covina crawl space ranges $3,500-$8,500 depending on square footage and access constraints.
How we do it
We install a reinforced vapor barrier across the floor and up walls, seal all vents and penetrations with rigid foam and closed-cell spray foam, add a mechanical dehumidifier with condensate pump, and deliver humidity readings before and after.
What Crawl Space Encapsulation & Vapor Barrier Costs in Covina
| Item | Typical range in Covina |
|---|---|
| Vapor barrier (6-20 mil, dirt floor only) | $1,200 - $2,800 |
| Partial encapsulation (floor + walls, no dehumidifier) | $2,800 - $5,500 |
| Full encapsulation with dehumidification | $3,500 - $8,500 |
How long does crawl space encapsulation take in Covina?
Most Covina crawl space encapsulations take 2-4 days depending on access, debris removal needs, and whether we find pest damage requiring repair before sealing. We deliver a written schedule with your written price before work starts - no surprises. Call (562) 242-7569 for a free estimate and exact timeline.
Will encapsulation fix my musty smell?
Yes, when the source is crawl space moisture - we measure pre-encapsulation humidity, install sealed barriers and mechanical dehumidification, and verify post-work readings below 60% relative humidity. If your odor persists, we’ll find why and make it right under our 365-Day Done Right Promise.
Radiant Barrier Installation in Covina
Covina’s attic temperatures routinely exceed 150°F in summer, and the city’s pre-1978 housing stock was built with no meaningful radiant barrier protection - just dark shingles and a vented attic cavity turning your ceiling into a radiant heater. A properly installed radiant barrier can reduce attic heat gain by 20-35%, which translates directly to shorter AC run times and lower peak demand during San Gabriel Valley heat waves. Radiant Barrier Installation is our answer for homes where the attic is the primary thermal battlefield.
Attic Radiant Barrier
Signs you need it
Your AC runs continuously from 2-7 PM in summer, your ceiling is hot to the touch on upper floors, or your cooling bills spike July through September despite reasonable thermostat settings.
What it costs in Covina
Radiant barrier foil stapled to rafters or laid over attic floor insulation in a typical Covina ranch home runs $1,800-$3,500 depending on attic square footage and accessibility.
How we do it
We air seal first - always - then install perforated radiant barrier foil with proper drape for ventilation channels, avoiding compression over existing insulation and ensuring electrical clearances.
Radiant Barrier & Ventilation
Signs you need it
Your attic has inadequate or blocked soffit vents, your ridge vent was covered during a re-roof, or you see mold on roof decking despite seemingly “adequate” ventilation.
What it costs in Covina
Radiant barrier paired with ventilation correction - adding soffit baffles, ridge vent, or powered exhaust - typically runs $2,800-$5,500 in Covina’s 1,200-2,000 square foot attics.
How we do it
We calculate net free ventilation area per IRC requirements, install baffles to preserve intake airflow, add exhaust ventilation as needed, then install radiant barrier with documented before-and-after attic temperature readings.
What Radiant Barrier Installation Costs in Covina
| Item | Typical range in Covina |
|---|---|
| Radiant barrier foil (rafter or floor application) | $1,800 - $3,500 |
| Radiant barrier with ventilation correction | $2,800 - $5,500 |
| Radiant barrier roof deck (new construction or re-roof) | $3,500 - $6,500 |
Does radiant barrier work with existing insulation?
Yes, but only after air sealing - we never install radiant barrier over an unsealed attic floor, since convective air movement bypasses radiant reflection. We seal first, test with the blower door, then install barrier and re-test so you see the combined effect in documented CFM50 reduction.
How much will my cooling bill drop?
Most Covina homeowners see 10-25% summer cooling reduction after radiant barrier plus air sealing, with the highest savings in homes with dark shingles and minimal existing attic insulation. We don’t guess - we measure attic surface temperatures before and after, and you get those numbers in writing. Call (562) 242-7569 for a free estimate.
Insulation Removal & Replacement in Covina
Covina’s 50-70 year old insulation is often a stratified mess: original R-11 batts flattened by decades of HVAC traffic, layered with thin blown cellulose from a 1990s flip, contaminated with rodent droppings, or holding moisture from roof leaks long since patched. We see this patchwork most often east of Citrus Avenue and in the downtown core, where homes changed hands repeatedly during the flipping era. Insulation Removal & Replacement starts with assessment, includes safe removal and disposal, and ends with properly installed new material over a sealed envelope.
Contaminated Insulation Removal
Signs you need it
You find rodent droppings, urine staining, or nesting material in attic insulation, or you smell ammonia or mustiness that intensifies in hot weather.
What it costs in Covina
Contaminated insulation removal with HEPA containment, PPE protocols, and proper disposal in Covina runs $2,500-$5,500 for a typical 1,200-2,000 square foot attic.
How we do it
We establish negative air pressure with HEPA filtration, remove contaminated material in sealed bags, apply EPA-registered sanitizer to exposed surfaces, and deliver photos documenting the clean substrate before new insulation goes in.
Insulation Replacement
Signs you need it
Your insulation is compressed below its original thickness, has visible water staining or mold, or delivers less than R-19 in a climate zone that calls for R-38 or higher.
What it costs in Covina
Full insulation removal and replacement with air sealing and new blown-in or batt insulation to R-38 typically runs $3,500-$7,500 in Covina’s ranch-style homes.
How we do it
We remove old material completely, seal all top plates, penetrations, and bypasses with foam and caulk, perform blower-door testing, then install new insulation to specified R-value with documented depth markers.
What Insulation Removal & Replacement Costs in Covina
| Item | Typical range in Covina |
|---|---|
| Contaminated insulation removal only | $2,500 - $5,500 |
| Standard insulation removal + replacement | $3,500 - $7,500 |
| Vermiculite removal (asbestos testing required) | $5,500 - $12,000 |
Do I have to leave during removal?
No for standard removal, yes for vermiculite or heavy contamination - we establish containment barriers and negative pressure, but recommend occupancy elsewhere during active removal for your comfort. We notify you 24 hours ahead if vacating is advised, and we never start work without a written scope detailing containment protocols.
Can you match my existing insulation type?
We can, but we rarely recommend it - Covina’s climate and your home’s current condition should drive material selection, not habit. We stock Owens Corning, Johns Manville, Knauf, and GreenFiber, and we’ll show you the R-value, air-sealing performance, and price of each option before you decide. Call (562) 242-7569 for a free second opinion on any competing quote.
Attic Air Sealing in Covina
Covina’s pre-1978 tract homes were built with minimal attention to the attic floor as an air barrier - top plates were left open, electrical and plumbing penetrations were cut and forgotten, and can lights were installed with no rated enclosures. In a climate where attics hit 150°F, every crack is a chimney pumping conditioned air out and superheated air in. Attic Air Sealing is the foundation of every insulation job we do, and we prove the result with blower-door numbers.
Top Plate & Penetration Sealing
Signs you need it
You feel hot spots on your ceiling in summer, see dirty insulation indicating air filtration, or your blower-door test shows excessive leakage despite seemingly intact insulation.
What it costs in Covina
Top plate and penetration sealing for a typical Covina ranch attic runs $1,500-$3,200, with complexity increasing for homes with extensive recessed lighting or multiple HVAC zones.
How we do it
We expose top plates at all interior and exterior walls, seal with expanding foam and fire-rated caulk, foam or box every wire and pipe penetration, and verify with blower-door testing before insulation goes back.
Can Light & Duct Boot Sealing
Signs you need it
You have original non-IC can lights in your ceiling, your HVAC ducts in the attic show dust blow-by at connections, or rooms farthest from the air handler are consistently hotter or colder.
What it costs in Covina
Sealing or replacing non-IC can lights with rated enclosures and sealing all duct boots with mastic typically adds $800-$2,200 to attic air sealing in Covina homes.
How we do it
We install fire-rated airtight enclosures over each can light, seal duct boots with mastic and mechanical fasteners, and pressure-test the duct system where accessible to confirm no bypass leakage.
What Attic Air Sealing Costs in Covina
| Item | Typical range in Covina |
|---|---|
| Top plate and penetration sealing | $1,500 - $3,200 |
| Can light and duct boot sealing | $800 - $2,200 |
| Full attic air sealing (comprehensive) | $2,500 - $5,500 |
Will air sealing alone lower my bills?
Yes - typically 10-20% in Covina’s climate, with the biggest gains in homes with the leakiest attic floors. We measure with the blower door before and after, and you’ll see your CFM50 number drop in writing. Insulation added over an unsealed floor is largely wasted; sealed first, then insulated, in that order.
How do I know if my attic is leaky?
Schedule our blower-door test - a pressurization reading that shows, in one number, how much air your building envelope is losing. Covina’s older homes typically test at 3,500-6,000 CFM50; after our air sealing, we target 2,000-3,000 or better. The test takes under two hours and comes with a written report. Call (562) 242-7569 to schedule.
Wall Insulation in Covina
Covina’s 1950s-1960s tract homes were built with 2×4 walls and R-11 batts - far below current standards - and many have no wall insulation at all in garage-adjacent rooms or additions. The San Gabriel Valley’s temperature swings mean uninsulated walls radiate cold in winter and absorb heat in summer, creating the uncomfortable rooms homeowners learn to avoid. Wall Insulation for existing homes means working from the inside with minimal disruption, or from the exterior during siding replacement.
Drill & Fill Wall Insulation
Signs you need it
Your exterior walls are cold to the touch in January, you have rooms that are consistently 5-10 degrees different from the thermostat setting, or your home was built before 1978 with no insulation in exterior walls.
What it costs in Covina
Drill-and-fill with dense-pack cellulose or fiberglass in a typical Covina ranch home runs $2,500-$5,500 depending on wall square footage and interior versus exterior access.
How we do it
We drill 2-inch holes at stud bay intervals, blow cellulose or fiberglass to calculated density with continuous fill verification, plug with matching patches, and deliver a photo record of each wall section completed.
Injection Foam Wall Insulation
Signs you need it
Your walls have irregular cavities, abandoned chimney chases, or mixed framing that prevents consistent dense-pack fill, or you need both insulation and air sealing in one application.
What it costs in Covina
Injection foam for a typical Covina home with 1,500-2,500 square feet of wall area runs $3,500-$7,500, with open-cell at the lower end and closed-cell at the higher end.
How we do it
We access wall cavities through interior or exterior openings, inject slow-rise foam to fill without bowing studs, trim after cure, and verify fill completeness with thermal imaging before closing.
What Wall Insulation Costs in Covina
| Item | Typical range in Covina |
|---|---|
| Drill & fill (dense-pack cellulose or fiberglass) | $2,500 - $5,500 |
| Injection foam (open-cell) | $3,500 - $6,500 |
| Injection foam (closed-cell) | $5,000 - $7,500 |
Will drill-and-fill damage my walls?
We patch every hole with matching texture - the process is designed for finished homes, and our crews are trained in drywall repair as part of the scope. You get a photo of each patch before we leave, and any texture mismatch is corrected under our 365-Day Done Right Promise.
Can you insulate walls from outside?
Yes, during siding replacement or if your exterior is already open - this is often faster and leaves zero interior repair. If you’re planning re-siding, call us first; we coordinate with your siding contractor to sequence insulation before the new exterior goes on. Call (562) 242-7569 to discuss timing.
Attic Cleaning & Rodent Proofing in Covina
Covina’s mature tree canopy and older housing stock create ideal conditions for roof rat and squirrel access - gnawed fascia boards, unscreened vents, and gaps at roof-wall junctions that have opened over decades of settlement. Once inside, rodents compress and contaminate insulation, creating health hazards and destroying R-value simultaneously. Attic Cleaning & Rodent Proofing addresses both the infestation evidence and the entry points that allowed it.
Attic Sanitizing & Decontamination
Signs you need it
You hear scratching at night, find droppings in the attic or insulation, or see grease marks (sebum trails) along rafters and pipes where rodents travel repeatedly.
What it costs in Covina
Attic sanitizing and decontamination with HEPA removal, enzyme treatment, and surface disinfection in a typical Covina attic runs $1,800-$4,500 depending on contamination extent and insulation replacement needs.
How we do it
We remove contaminated insulation under negative pressure, apply enzyme digester to break down organic waste, fog EPA-registered sanitizer, and deliver lab-verified clearance or proceed to new insulation installation.
Rodent Proofing & Exclusion
Signs you need it
You’ve had repeated pest control treatments but rodents return within months, or you can see gaps at roof vents, plumbing penetrations, or fascia gaps larger than 1/4 inch.
What it costs in Covina
Comprehensive rodent proofing with metal flashing, hardware cloth, and sealant for a typical Covina home runs $1,500-$3,500, with complexity increasing for tile roofs or multiple roof levels.
How we do it
We inspect every potential entry with photo documentation, install gnaw-proof metal barriers at all access points, seal with concrete or metal where appropriate, and guarantee the work - if rodents breach our exclusion, we return and fix it.
What Attic Cleaning & Rodent Proofing Costs in Covina
| Item | Typical range in Covina |
|---|---|
| Attic sanitizing and decontamination | $1,800 - $4,500 |
| Rodent proofing and exclusion | $1,500 - $3,500 |
| Full attic restoration (cleaning + proofing + insulation) | $4,500 - $9,500 |
Do you trap rodents or just seal?
We coordinate with your pest control provider or can recommend one - our scope is structural exclusion and restoration, not trapping. We seal every entry so rodents can’t return, then clean and reinsulate so your attic performs as intended. Call (562) 242-7569 for a free assessment of entry points and contamination.
How do I know if my insulation is contaminated?
Look for compressed tunnels through insulation, dark staining from urine, scattered droppings, or a persistent ammonia smell that worsens in summer heat. We document everything with photos during our inspection, and we don’t push replacement if cleaning alone is sufficient - you’ll get an honest scope with a written price for each option.
Home Energy Audit in Covina
Covina’s combination of old housing stock, extreme summer heat, and layered, often compromised insulation creates complex energy problems that single-symptom fixes can miss. A homeowner chasing high cooling bills with more attic insulation may never address the duct leakage in a 150°F attic that’s losing 30% of conditioned air before it reaches the rooms. Home Energy Audit is our diagnostic starting point: measure everything, prioritize by cost-effectiveness, and build a written scope with prices for each improvement.
Blower Door Test
Signs you need it
Your energy bills are 30% or more above similar homes, you feel drafts even with windows closed, or you’re planning insulation work and want to measure the actual improvement.
What it costs in Covina
A standalone blower-door test with written report in Covina runs $350-$650, and is credited toward any work we perform within 90 days.
How we do it
We install a calibrated fan in an exterior door, depressurize the house to 50 Pascals, measure CFM50 leakage, and use smoke pencils and thermal imaging to locate major leak paths while the house is under test.
Thermal Imaging Inspection
Signs you need it
You have rooms that never reach temperature, suspect missing insulation in walls or cathedral ceilings, or want to verify contractor work before final payment.
What it costs in Covina
Thermal imaging as part of a full energy audit runs $450-$850 in Covina, or $250-$450 as a standalone inspection focused on specific problem areas.
How we do it
We scan every interior and accessible exterior surface with a FLIR camera during heating or cooling season, annotate images with temperature differentials, and deliver a report mapping insulation gaps, moisture intrusion, and thermal bridging.
What Home Energy Audit Costs in Covina
| Item | Typical range in Covina |
|---|---|
| Blower-door test with written report | $350 - $650 |
| Thermal imaging inspection | $250 - $450 |
| Comprehensive home energy audit | $450 - $850 |
Will the audit tell me what to fix first?
Yes - we rank recommendations by cost-effectiveness and your stated priorities, with written prices for each option. In Covina’s climate, air sealing and attic insulation typically deliver the fastest payback, but your home’s specific test results may point elsewhere. You get the data, not a sales pitch.
How long does a full audit take?
Plan on 3-4 hours for a comprehensive audit including blower-door test, thermal imaging, duct pressure testing, and combustion safety checks. We schedule morning starts to catch good thermal imaging conditions, and you receive your written report with prioritized recommendations and prices within 48 hours. Call (562) 242-7569 to schedule.
Brands We Service in Covina
We source insulation and air-sealing materials from Owens Corning, Johns Manville, Knauf, Rockwool, CertainTeed, Icynene, Demilec, and GreenFiber - no proprietary product lock-in means we specify what’s right for your home’s condition and your budget. Our Los Angeles office stocks common materials for Covina jobs, so most projects start within a week of written approval. our brands
Pricing for Insulation in Covina, CA
| Service | Typical range in Covina |
|---|---|
| Crawl space vapor barrier (6-20 mil) | $1,200 - $2,800 |
| Full crawl space encapsulation | $3,500 - $8,500 |
| Radiant barrier foil installation | $1,800 - $3,500 |
| Radiant barrier with ventilation correction | $2,800 - $5,500 |
| Contaminated insulation removal | $2,500 - $5,500 |
| Insulation removal and replacement | $3,500 - $7,500 |
| Attic air sealing (comprehensive) | $2,500 - $5,500 |
| Drill & fill wall insulation | $2,500 - $5,500 |
| Injection foam wall insulation | $3,500 - $7,500 |
| Attic sanitizing and decontamination | $1,800 - $4,500 |
| Rodent proofing and exclusion | $1,500 - $3,500 |
| Comprehensive home energy audit | $450 - $850 |
Prices in Covina push higher when we encounter layered, patchwork insulation from previous flip-era work, limited attic access in older ranch homes, or the need for structural repairs before insulation can perform. Every job still begins with a written price before any work starts - Haven Standard Clause 1 - and ends with a Documented Photo Record; on applicable jobs, before-and-after blower-door readings are provided so you can verify the air-sealing result.
Neighborhoods We Serve in Covina
Our crews work throughout Covina’s residential core, from the historic downtown blocks to the postwar ranch tracts north of Badillo Street and the hillside homes approaching the San Gabriel foothills. Dispatch and scheduling are coordinated from our Los Angeles office; crews serve Covina locally with same-day response for urgent calls.
- Downtown Covina Historic District
- Charter Oak
- Valleydale
- North Covina (Badillo Street corridor)
- Covina Hills
Service Area - Cities Near Covina
We serve the full San Gabriel Valley insulation market from our Los Angeles coordination office, with local crews regularly working Azusa, CA to the north, West Covina, CA immediately west, Baldwin Park, CA to the southwest, and Glendora, CA to the northeast. Each city gets the same Haven Standard: written price before work starts, documented record when we leave, and blower-door numbers on every applicable job.
Serving Covina, CA - Our Local Coverage Area
We’re based in the Covina area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs About Insulation in Covina
Yes - the City of Covina requires permits for attic insulation work that involves removal, replacement, or air sealing modifications; we pull permits as part of our standard scope and include the cost in your written price. Our familiarity with Covina’s building department means most permits clear within 3-5 business days.
Most Covina jobs start within 5-10 business days of written approval, with emergency calls for failed insulation or pest contamination prioritized for same-day or next-day response. A live person answers our phones 24/7 - no voicemail loops - and you’ll get a text when your technician is en route.
Yes - we’ve worked with multiple Covina HOAs and understand their documentation requirements for exterior modifications, color matching, and work-hour restrictions. We provide the written scope, material specifications, and proof of insurance they typically require, and we schedule around HOA maintenance windows when needed.
Ready to see what your home’s actually losing? Call (562) 242-7569 for a free estimate with a written price before any work starts. We’ll run the blower-door test, show you the numbers, and build a scope that fixes what’s actually broken.
What happens when you call
- 1A real person answersNo phone trees - talk to a local insulation pro.
- 2You get an upfront price rangeHonest numbers before anyone is dispatched. No surprises.
- 3A background-checked tech heads outLicensed & insured, typically within 1-hour.
- 4You approve before work beginsNothing starts until you say go.
What Covina Customers Say
"Crawl space encapsulation done properly. Photographs of the vapour barrier at every seam, and the damp smell in the hallway is gone."
- Ainsley P."Two other companies quoted to blow more insulation on top of what was there. These were the only ones who said the existing material had to come out first, and explained why."
- Clifford E."They air-sealed the attic floor before insulating and showed me the blower-door number before and after. The upstairs is finally the same temperature as downstairs."
- Marisol D.