Insulation in Lewisville, TX
Spray foam insulation in Lewisville typically runs $3.20-$7.75 per square foot installed, and most homeowners choose it because their 1980s or early 1990s brick-veneer tract home has HVAC ductwork baking in an unconditioned attic that hits 145°F every July. Attic air sealing plus blown-in insulation runs $2,900-$5,600 for a typical 1,800-square-foot house. Call (218) 261-7714 and you’ll get a written price before any work starts, not a verbal ballpark.
Why Lewisville Homes Are Different
Lewisville’s housing stock grew in a wave that now defines our work here. Between roughly 1978 and 1995, block after block of slab-on-grade, brick-veneer tract homes went up before Texas adopted its first statewide energy code in 2001. Those attics were built with R-11 to R-19 insulation, less than half the R-38 minimum code requires today. The older streets near downtown Lewisville and the early Lake Lewisville-area subdivisions are the most consistent examples: blown-in fiberglass has compacted to 3 or 4 inches, and recessed can lights punch through the ceiling plane uninsulated, each one acting like a small chimney into the attic. On a July afternoon, a thermal camera makes those heat columns visible in seconds.
Climate Zone 3 is the other half of the story. Lewisville summers push attic temperatures to 155°F, which is brutal for any HVAC air handler sitting up there. Then February 2021 happened. Winter Storm Uri froze homes that had never been insulated for sustained sub-freezing days, and it exposed exactly how thin pre-code North Texas insulation really is. The same house that overheats in August can’t hold heat in a hard freeze. We specify every Lewisville job for both extremes.
One more local reality: most HVAC systems in these neighborhoods have their air handlers and duct runs inside the attic. That was code-legal for decades and deeply inefficient. Sealing and insulating the attic envelope changes the whole performance picture because the mechanical system stops fighting a 150°F space.
Our Main Lewisville Services
Two jobs dominate our Lewisville schedule. Both come back to the same pre-code housing wave and the same unconditioned attic problem.
Attic Insulation in Lewisville
Most Lewisville attics we inspect have original blown-in fiberglass settled to R-11 or R-19, with top plates and can lights left unsealed from the day the house was framed. The fix is a top-up or full removal and reinstall, always after air sealing. We publish before-and-after blower-door numbers on every applicable job so you can see the air-leakage drop in one figure. For the full scope, see our dedicated page: Attic Insulation in Lewisville.
Crawl Space Encapsulation & Vapor Barrier in Lewisville
Some Lewisville homes on the east side and near the lake sit over vented crawl spaces rather than slabs, and North Texas humidity makes those spaces a mold and moisture liability nine months a year. Encapsulation closes the crawl space with a vapor barrier, seals the vents, and conditions the space so it stops pulling damp air into the house. That is a full building-envelope job, not a plastic-sheet afterthought. See the details here: Crawl Space Encapsulation & Vapor Barrier in Lewisville.
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.
Spray Foam Insulation in Lewisville
Spray foam insulation in Lewisville is the highest-impact retrofit for homes with HVAC equipment and ducts trapped in the attic. Open-cell foam on the roof deck brings that entire space into the building envelope, which means your air handler stops pulling 145°F attic air through every seam and the ducts stop losing a third of their conditioned air on the way to your vents. We install open-cell and closed-cell systems from Icynene and similar manufacturers, and every job starts with air sealing because foam over an unsealed attic floor defeats the purpose. For a detailed breakdown of the material and the process, see our Spray Foam Insulation page.
Open-Cell Spray Foam
Signs you need it
Your upstairs rooms run 8-10°F hotter than the downstairs in July, or your HVAC runs continuously from 3 p.m. to sunset.
What it costs in Lewisville
Open-cell spray foam on the roof deck typically runs $3.20-$5.50 per square foot installed in Lewisville.
How we do it
We air-seal top plates and penetrations first, then spray 5-6 inches of open-cell foam across the entire roof deck to create a semi-conditioned attic.
Closed-Cell Spray Foam
Signs you need it
You have a flat or low-slope roof, or you need high R-value per inch because the attic is shallow and mechanically crowded.
What it costs in Lewisville
Closed-cell spray foam runs $4.50-$7.75 per square foot installed in Lewisville, with the higher end covering wall-cavity and rim-joist work.
How we do it
We spray closed-cell foam at 2-3 inches for roof decks or rim joists, using a two-component system that cures to a rigid, vapor-resistant barrier.
What Spray Foam Insulation Costs in Lewisville
| Item | Typical range in Lewisville |
|---|---|
| Open-cell roof deck, 1,800 sq ft attic | $5,760-$9,900 |
| Closed-cell roof deck, 1,800 sq ft attic | $8,100-$13,950 |
| Rim joist spray foam, 150 linear ft | $675-$1,160 |
Does spray foam work in a 1990s Lewisville attic with ductwork up there?
Yes. That is the single best application. Foam on the roof deck brings the ducts and air handler into semi-conditioned space, cutting duct losses the same day.
Will spray foam make my Lewisville roof too hot or cause shingle damage?
No study we have seen supports shingle-deck overheating from spray foam. The bigger risk is skipping air sealing first, which traps air leaks behind the foam.
Blown-In Insulation in Lewisville
Blown-in insulation in Lewisville is the most common retrofit on pre-code tract homes with settled original fiberglass. We blow cellulose or fiberglass over an air-sealed attic floor to bring total depth up to R-38 or better, and the result is immediate: less heat radiating through the ceiling in August and less heat escaping during a Uri-style freeze. The material choice depends on the attic’s condition and your budget, and we stock both. Our Blown-In Insulation hub page covers the differences in detail.
Blown-In Cellulose
Signs you need it
Your existing attic insulation measures 3-6 inches deep and you can see bare drywall or joist tops between the old rows.
What it costs in Lewisville
Blown-in cellulose in Lewisville typically runs $1,450-$2,800 for a 1,000-square-foot attic brought to R-38, plus air sealing.
How we do it
We use a dense-pack machine to blow recycled cellulose to the specified depth, but only after every top plate, can light, and penetration is sealed.
Blown-In Fiberglass
Signs you need it
You want an insulation-upgrade path that won’t settle as much as cellulose and works well in hard-to-reach truss attics common in Lewisville.
What it costs in Lewisville
Blown-in fiberglass in Lewisville runs $1,650-$3,200 for a 1,000-square-foot attic at R-38, including disposal of any contaminated top layer.
How we do it
We air-seal the attic floor first, then blow loose-fill fiberglass to the target depth using a calibrated machine and depth markers for verification.
What Blown-In Insulation Costs in Lewisville
| Item | Typical range in Lewisville |
|---|---|
| Attic floor top-up, 1,000 sq ft, R-38 | $1,450-$3,200 |
| Attic floor full removal and re-blow, 1,000 sq ft | $3,450-$5,600 |
| Dense-pack wall insulation, per 100 sq ft of wall | $350-$700 |
Can you blow insulation over my existing old fiberglass in Lewisville?
Usually yes, after we inspect for moisture, rodent activity, and settled depth. If the old layer is contaminated or compressed below R-11, removal makes more sense.
Will blown-in insulation stop my August cooling bill from spiking?
It will cut the ceiling-plane heat gain substantially, but attic temperatures stay high in Lewisville. Air sealing plus a radiant barrier gets the most improvement.
Radiant Barrier Installation in Lewisville
Radiant barrier installation in Lewisville targets the biggest summer problem in Climate Zone 3: 155°F attic surfaces radiating heat down through your ceiling insulation. A foil radiant barrier stapled to the roof deck reflects that energy back before it ever reaches the insulation below, and on a pre-code Lewisville attic with only R-11 to R-19 of old insulation, it is the highest-value cooling-season upgrade short of foam encapsulation. We install it as a complement to blown-in insulation, never a substitute. Details on materials and placement: Radiant Barrier Installation.
Attic Radiant Barrier
Signs you need it
Your attic is over 130°F in the afternoon and the ceiling below feels warm to the touch in summer, even with insulation present.
What it costs in Lewisville
Attic radiant barrier in Lewisville runs $1,200-$2,650 for a typical 1,800-square-foot attic, installed on the roof deck underside.
How we do it
We staple foil-faced radiant barrier to the underside of the rafters, keeping a small air gap at the top and bottom so heat can vent out the ridge.
Radiant Barrier Foil
Signs you need it
You want a lower-cost alternative to foam that still cuts the radiant heat load in a Lewisville attic with existing but insufficient insulation.
What it costs in Lewisville
Radiant barrier foil in Lewisville runs $0.65-$1.20 per square foot installed when done as part of a larger attic job.
How we do it
We install double-sided or single-sided foil depending on whether dust accumulation is a concern, then document the installation with photos you keep.
What Radiant Barrier Installation Costs in Lewisville
| Item | Typical range in Lewisville |
|---|---|
| Attic radiant barrier, 1,800 sq ft roof deck | $1,200-$2,650 |
| Radiant barrier foil, per sq ft | $0.65-$1.20 |
| Radiant barrier with attic ventilation fix | $1,800-$3,400 |
Does a radiant barrier do anything in a Lewisville winter?
Not much. It reflects radiant heat, which is a summer problem. In cold weather it has no meaningful effect on conduction losses through the attic floor.
Can I use radiant barrier instead of adding insulation in Lewisville?
No. Radiant barrier slows radiant heat gain only. You still need R-38 insulation on the attic floor to stop conducted heat from moving into the house.
Insulation Removal & Replacement in Lewisville
Insulation removal and replacement in Lewisville becomes necessary when the original blown-in fiberglass has compressed to 3 inches, been soaked by a roof leak, or been contaminated by rodents that nested in the attic for years. On pre-code Lewisville homes, leaving that old layer in place means insulating over a mess that is already failing, so we remove it, seal the attic floor, and start clean. You get a written scope before we start and a photo record of every step. More on the process: Insulation Removal & Replacement.
Attic Insulation Removal
Signs you need it
Your attic insulation has settled to 3-4 inches, shows dust and debris accumulation, or reads below R-11 on inspection.
What it costs in Lewisville
Attic insulation removal in Lewisville runs $1,900-$3,600 for a typical 1,200-1,800-square-foot attic.
How we do it
We set up a high-powered vacuum and run a containment path from the attic hatch to the outdoor truck, removing the old insulation without dusting the house.
Contaminated Insulation Removal
Signs you need it
You have had a roof leak, a rodent infestation, or a bathroom exhaust vent that has been dumping moisture into the attic insulation for years.
What it costs in Lewisville
Contaminated insulation removal in Lewisville adds $650-$1,400 to the base removal cost for sanitizing and disposal procedures.
How we do it
We remove the contaminated material, sanitize the attic floor and truss cavities, and document the before-and-after condition in the photo record you receive.
What Insulation Removal & Replacement Costs in Lewisville
| Item | Typical range in Lewisville |
|---|---|
| Attic insulation removal, 1,500 sq ft | $1,900-$3,600 |
| Contaminated removal and sanitizing | $2,550-$5,000 |
| Full removal plus R-38 re-blow, 1,500 sq ft | $4,200-$6,800 |
Can you remove insulation from a Lewisville attic without dragging it through my house?
Yes. We run a vacuum hose from the attic hatch directly to the truck outside. The house interior stays clean, and we lay down protective floor covering on the path.
Is it cheaper to just blow new insulation over the old stuff in Lewisville?
Sometimes, if the old layer is dry, clean, and deep enough to stay in place. If it has compressed past R-11 or been contaminated, full removal is the cheaper long-term fix.
Attic Air Sealing in Lewisville
Attic air sealing in Lewisville is the step that separates real insulation work from someone just blowing fiberglass over your problems. On pre-code tract homes, the top plates where interior walls meet the attic floor were never sealed, and every can light and plumbing penetration is an open channel between your air-conditioned rooms and a 145°F attic. We seal all of it before any insulation goes in, then measure the result with a blower-door test so you see the CFM50 number drop in black and white. That is the whole envelope, and it is the only order we work in. See Attic Air Sealing for the full method.
Top Plate & Penetration Sealing
Signs you need it
You feel drafts around interior walls in winter, or a blower-door test shows more than 3,000 CFM50 of leakage on a Lewisville tract house.
What it costs in Lewisville
Top plate and penetration sealing in Lewisville runs $900-$1,800 for a typical attic, before any insulation work.
How we do it
We pull back the existing insulation, seal every top plate seam with foam or caulk, then re-cover the area before blowing new insulation.
Can Light & Duct Boot Sealing
Signs you need it
Recessed can lights in the attic are hot to the touch in summer, or your HVAC runs longer than it should for the square footage.
What it costs in Lewisville
Can light and duct boot sealing in Lewisville runs $18-$30 per fixture or boot, typically $350-$900 on a whole-attic job.
How we do it
We install sealed, fire-rated covers over non-IC can lights and foam or mastic-seal every duct boot where it meets the ceiling.
What Attic Air Sealing Costs in Lewisville
| Item | Typical range in Lewisville |
|---|---|
| Whole-attic air sealing, 1,800 sq ft home | $1,400-$2,650 |
| Can light sealing, per fixture | $18-$30 |
| Blower-door test with before-and-after readings | $245-$450 |
Why does air sealing have to happen before insulation in Lewisville?
Because blowing insulation over unsealed leaks hides the problem and wastes the R-value you paid for. Seal first, then insulate. That order is non-negotiable on our jobs.
What CFM50 improvement should a Lewisville pre-code home see?
On a 1,800-square-foot tract house, we regularly measure 4,200 CFM50 before sealing and 2,100 after. You get both numbers in the written record.
Wall Insulation in Lewisville
Wall insulation in Lewisville is the quiet fix for rooms that never hold temperature, which is common in slab-on-grade tract homes with brick veneer and minimal original wall insulation. Exterior walls in 1980s and early 1990s Lewisville homes were often built with thin fiberglass batts or, on some early builds, nothing at all behind the drywall. We inject or dense-pack the cavities from the exterior or interior, and the improvement shows up first in rooms that used to run 6-8°F off from the rest of the house. Our Wall Insulation page walks through the method by wall type.
Injection Foam Wall Insulation
Signs you need it
Exterior walls feel cold to the touch in a Lewisville freeze, or rooms on the west side of the house stay hot through the evening in summer.
What it costs in Lewisville
Injection foam wall insulation in Lewisville runs $3.40-$5.80 per square foot of wall area, depending on cavity depth and access.
How we do it
We drill small access holes through the brick or drywall, inject foam into each stud cavity, and then patch the holes flush with matching material.
Dense-Pack Wall Insulation
Signs you need it
You hear road noise or neighbor noise through exterior walls, or you see old insulation slumping inside wall cavities during a remodel.
What it costs in Lewisville
Dense-pack wall insulation in Lewisville runs $2.80-$4.20 per square foot of wall area, typically $3,200-$6,000 for a full exterior retrofit.
How we do it
We dense-pack cellulose or fiberglass into wall cavities under pressure, filling every void so there are no gaps or settling later.
What Wall Insulation Costs in Lewisville
| Item | Typical range in Lewisville |
|---|---|
| Injection foam, full exterior wall retrofit | $5,400-$9,800 |
| Dense-pack cellulose walls, 1,800 sq ft home | $3,200-$6,000 |
| Interior wall soundproofing, per room | $850-$1,900 |
Can you insulate the walls of a Lewisville brick home without tearing out drywall?
Yes. We drill from the exterior through the mortar joints or from the interior through the drywall, inject the insulation, and patch the holes. The brick face stays intact.
Why do west-facing rooms in Lewisville stay hot after sunset?
Because the brick veneer absorbed hours of afternoon sun and keeps radiating heat into the wall cavity. Cavity insulation slows that transfer, but air sealing and attic work also matter.
Attic Cleaning & Rodent Proofing in Lewisville
Attic cleaning and rodent proofing in Lewisville goes hand in hand with the insulation work because the same pre-code houses that lost their R-value also have open soffit gaps and roof returns that rats and squirrels use as entry doors. We remove contaminated insulation, sanitize the attic, wire-brush any soiled truss areas, and then seal every entry point so the problem does not return in a month. It is a two-part job: clean out what the rodents left, then close the building envelope they came through. Full details: Attic Cleaning & Rodent Proofing.
Attic Cleanout
Signs you need it
You see droppings, nesting material, or scattered insulation in the attic, or you hear scratching in the ceiling at dawn and dusk.
What it costs in Lewisville
Attic cleanout in Lewisville runs $850-$2,100 for a typical 1,200-1,800-square-foot attic, including disposal of waste material.
How we do it
We remove damaged insulation and debris, vacuum the attic floor, and haul every bag off-site in a sealed truck.
Rodent Proofing & Exclusion
Signs you need it
You find new droppings or chewed wiring within weeks of cleaning, which means entry points are still open somewhere in the roofline or soffits.
What it costs in Lewisville
Rodent proofing and exclusion in Lewisville runs $750-$2,400, depending on the number of roof returns, gable vents, and soffit gaps found.
How we do it
We seal every opening with galvanized steel mesh, foam, and flashing, then check the attic with a thermal camera to confirm no hidden routes remain.
What Attic Cleaning & Rodent Proofing Costs in Lewisville
| Item | Typical range in Lewisville |
|---|---|
| Attic cleanout, 1,500 sq ft attic | $850-$2,100 |
| Rodent proofing and exclusion | $750-$2,400 |
| Cleanout plus full exclusion plus re-insulation | $3,800-$6,200 |
Does rodent proofing come with any kind of guarantee in Lewisville?
Yes, the 365-Day Done Right Promise covers exclusion work. If rodents get back in through a point we sealed, we re-seal it at no charge within that window.
Should I clean the attic before or after re-insulating in Lewisville?
Before. Blowing new insulation over rodent waste locks the contamination under a clean-looking top layer. Remove, sanitize, then insulate.
Home Energy Audit in Lewisville
A home energy audit in Lewisville gives you a single written record of where your pre-code house is losing conditioned air, and it is the only way to know whether the next dollar should go into the attic, the walls, or the duct system. We run a blower-door test, scan every room and attic surface with a thermal camera, and test duct leakage under pressure. On Lewisville tract homes, the audit almost always shows the attic as the top air-loss zone, but the numbers tell you how bad it is. See Home Energy Audit for the full test list.
Blower Door Test
Signs you need it
Your energy bills swing wildly between summer and winter, or you want a documented CFM50 baseline before paying for any retrofit work.
What it costs in Lewisville
A blower door test in Lewisville runs $245-$450 as a standalone service, and it is included on any full energy audit.
How we do it
We mount the blower door in an exterior doorway, depressurize the house to 50 pascals, and record the CFM50 number with a calibrated manometer.
Thermal Imaging Inspection
Signs you need it
Rooms run unevenly hot or cold, or you suspect missing insulation behind walls and ceilings but cannot see into the cavities.
What it costs in Lewisville
A thermal imaging inspection in Lewisville runs $280-$500, including a written report with annotated images of every anomaly found.
How we do it
We scan every interior surface, attic, and exterior wall with a high-resolution thermal camera, then document heat anomalies in a delivered photo report.
What Home Energy Audit Costs in Lewisville
| Item | Typical range in Lewisville |
|---|---|
| Full home energy audit with blower door | $545-$900 |
| Blower door test only | $245-$450 |
| Thermal imaging add-on | $280-$500 |
What does a home energy audit in Lewisville actually tell me?
It tells you, in CFM50 and thermal images, exactly where your house leaks air and where insulation is missing or failed. Then you can prioritize repairs with real data.
Do I need an energy audit before an insulation quote in Lewisville?
No, but it makes the quote more accurate. Without it, we can inspect the attic and give you a written price. With it, you get a whole-house priority list.
Brands We Service in Lewisville
We work with Knauf, Rockwool, CertainTeed, and Icynene materials depending on the application, and we stock common replacement batts, loose-fill, and foam systems locally. Most brand-specific orders arrive within two to three business days. See our brands for the full material line.
Pricing for Insulation in Lewisville, TX
| Service | Typical range in Lewisville |
|---|---|
| Spray foam, open-cell roof deck (1,800 sq ft) | $5,760-$9,900 |
| Spray foam, closed-cell roof deck (1,800 sq ft) | $8,100-$13,950 |
| Blown-in attic top-up, R-38 (1,000 sq ft) | $1,450-$3,200 |
| Full attic removal and re-blow (1,000 sq ft) | $3,450-$5,600 |
| Radiant barrier (1,800 sq ft roof deck) | $1,200-$2,650 |
| Attic air sealing, whole attic | $1,400-$2,650 |
| Wall insulation, injection foam (full retrofit) | $5,400-$9,800 |
| Attic cleanout with rodent proofing | $3,800-$6,200 |
| Home energy audit with blower door | $545-$900 |
The biggest price drivers in Lewisville are contaminated insulation removal, deep truss attics that slow the crew down, and homes where HVAC equipment blocks large portions of the attic. Whatever the number, you get it in writing before any work starts, and the price does not move after the contract is signed.
Neighborhoods We Serve in Lewisville
We run insulation and air-sealing jobs across Lewisville every week, with crews familiar with the housing stock in each area. We schedule most neighborhood jobs within 3 to 5 business days.
- Old Town Lewisville and the streets near Main and Mill
- Lake Lewisville-area subdivisions
- The Colony border area and east Lewisville tracts
- Southwest Lewisville near Vista Ridge and Garden Ridge
- Castle Hills and the northern 121 corridor neighborhoods
Service Area - Cities Near Lewisville
Our crews cover the whole Dallas-Fort Worth metro north corridor. For insulation work in the neighboring cities, see our pages for Flower Mound, TX, Carrollton, TX, Plano, TX, and Richardson, TX. Dispatch and scheduling are coordinated from our DFW office, with crews serving Lewisville locally.
Serving Lewisville, TX - Our Local Coverage Area
We’re based in the Lewisville 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 Lewisville
Most Lewisville jobs are scheduled within 3 to 5 business days, and we answer the phone live 24/7, so a real person will give you a date, not a callback window.
Most insulation and air-sealing work does not require a city permit in Lewisville, but some HOAs require a project review. We will tell you what your neighborhood needs before the written price.
The 365-Day Done Right Promise covers the completed work. If it is not right, we make it right, and you already have the written scope, written warranty, and photo record to document what was agreed.
Ready to see the numbers for your Lewisville house? Call (218) 261-7714 and we will schedule the inspection, write the price, and send a named technician with a text when they are on the way.
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 Lewisville Customers Say
"The winter gas bill dropped by about a third. They had estimated a quarter, so they under-promised."
- Genevieve R."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."Fixed price, clean work, and they hauled the old material away as agreed."
- Todd M.