Blown-In Attic Insulation in San Antonio, TX

Blown-In Attic Insulation in San Antonio, TX

Blown-in attic insulation in San Antonio typically costs $1,100 to $2,800 for a standard 1,200 to 1,800 square foot attic, installed in a single day. It’s the fastest way to fix hot upstairs rooms, sky-high summer electric bills, and uneven temperatures between floors. At Laurel Attic Insulation San Antonio, we install blown-in fiberglass and cellulose from brands like GreenFiber and CertainTeed, with a written price before we start and photo proof of every square foot we cover. Call (254) 279-0971 to get your free estimate.

Most San Antonio homes built before 2010 are running on 6 to 10 inches of attic insulation, if that. The Department of Energy recommends R-38 to R-60 for our climate, and a blown-in job is often the only practical way to reach that depth without tearing out drywall. Our Attic Insulation team handles the full scope, from air sealing to top-offs, but this page covers what you need to know specifically about blown-in.

Here’s the short version: blown-in insulation is loose fiberglass or cellulose that’s pneumatically sprayed across your attic floor. It fills gaps, nests around pipes and junction boxes, and creates a continuous thermal blanket that batt insulation can’t match. Laurel stays green all year, so should your home’s comfort. That’s the idea behind the name.

Key Takeaways

• Cost in San Antonio: $1,100 – $2,800 for most attics, depending on square footage and R-value target.
• Installation time: One day, typically 2 – 4 hours for a standard attic.
• Energy savings: Most San Antonio homeowners see a 15 – 25% drop in cooling costs after upgrading to R-38 or higher.
• Best material for Texas heat: Cellulose (GreenFiber) or fiberglass (CertainTeed) both work well; cellulose has a slight edge for air infiltration.
• Laurel’s guarantee: 365-Day Done Right Promise and a free second visit if it fails, in writing.

When You Need Blown-In Attic Insulation

Here are the scenarios we walk into most often in San Antonio. If any of these sound familiar, your attic is likely under-insulated:

• Your upstairs is 8 – 10 degrees hotter than downstairs. In Stone Oak and Alamo Heights two-story homes, we regularly find attics with R-11 or R-19 coverage. Heat pours through the ceiling and the upstairs AC never catches up.
• Your summer CPS Energy bill tops $300 for a 2,000 sq ft home. Air conditioning accounts for roughly 55 – 65% of a San Antonio home’s summer energy use. An under-insulated attic forces your system to run nearly nonstop from June through September.
• You can see the tops of your ceiling joists. If you peek into the attic and see bare wood beams sticking up above the insulation, you’re at roughly R-13 or less. Code minimum for new construction in Bexar County is R-38.
• Your home was built before 2005 and insulation has never been touched. Insulation settles and loses effectiveness over time. Fiberglass batts installed 20 years ago have compacted, and the adhesive facing has often failed, leaving gaps.
• Rooms over the garage or bonus rooms are uncomfortable year-round. These spaces often sit above unconditioned areas with minimal insulation, and blown-in is the only way to reach the tight corners without opening walls.
• You’re tired of hearing every rainstorm and every neighbor’s dog. Blown-in insulation also acts as a sound buffer. It won’t silence everything, but it makes a noticeable difference in neighborhoods like Terrell Heights and Jefferson.

R-Value, Explained in Plain Language

R-value is the number that measures how well insulation resists heat moving through it. Higher R-value, slower heat transfer. In San Antonio, R-38 is the practical minimum we recommend, R-49 is ideal for most homes, and R-60 makes sense if you have a low-slope roof or a home with vaulted ceilings. Here’s what each depth gets you with blown-in fiberglass:

• R-38: roughly 13 inches of blown-in fiberglass, or 10 inches of cellulose
• R-49: roughly 16 inches of blown-in fiberglass, or 13 inches of cellulose
• R-60: roughly 20 inches of blown-in fiberglass, or 16 inches of cellulose

Cellulose packs a slightly higher R-value per inch, which is why GreenFiber cellulose is often our recommendation for attics with limited depth or tricky rooflines. We also install CertainTeed blown-in fiberglass for homeowners who prefer a fiberglass product with strong fire resistance.

Why Blown-In Beats Batts for Most San Antonio Attics

Fiberglass batts come in pre-cut rectangles. Attics are not rectangular. You have ducts, recessed light housings, plumbing vents, and cross-bracing. Every gap around those obstacles is a thermal leak if batts are installed carelessly. Blown-in insulation flows around all of it, forming a continuous layer with no seams.

We also see a lot of batt installations with compression. Homeowners shove extra batts into a cavity, or lay batts over wiring, and compressed fiberglass loses R-value. Blown-in doesn’t compress. It settles to its designed depth and holds there.

The other advantage is coverage speed. A 1,500 square foot attic takes our two-person crew about three to four hours with blown-in. The same attic with batts takes six to eight hours and still leaves seams.

Our Blown-In Attic Insulation Process

Here’s exactly what happens when you book blown-in insulation with Laurel Attic Insulation San Antonio:

1. You call or book online. A live person answers, 24/7. We ask about square footage, current insulation depth, hot spots, and your energy bills. We schedule a visit at a specific time, not a four-hour window.
2. We inspect your attic and give you a written price. Chase Whitaker or one of our senior techs measures the attic, checks for air leaks, identifies any existing issues like mold or rodent damage, and calculates the exact R-value you need. You get a written price before anything starts. No door-step surprises.
3. We prep the attic. We seal small air leaks around plumbing penetrations and junction boxes where it’s practical, tag any recessed lights that need protective covers, and confirm your soffit vents are clear. We don’t block ventilation; that’s how you get moisture problems.
4. We blow the insulation to the specified depth. Our crew runs a hose from the truck to the attic and applies insulation evenly to the depth on your written quote. We monitor depth markers throughout the job.
5. You get photo proof before we leave. We photograph the finished attic from multiple angles, including the corners and around the attic hatch. You get those photos in your digital invoice, which you can pay from a link.
6. Your 365-Day Done Right Promise starts the day we finish. If anything isn’t right within a year, we come back and make it right. Free second visit if the repair fails. In writing.

Blown-In Attic Insulation Pricing in San Antonio

Most blown-in attic insulation jobs we do in San Antonio run $1,100 to $2,800. Here’s the honest breakdown of what affects the price:

Scope	Typical Price Range	What’s Included
Top-off (add 6-8 inches over existing)	$700 – $1,200	Blown-in fiberglass or cellulose to reach R-38, basic air sealing at penetrations
Full attic, 1,200 sq ft, R-38	$1,100 – $1,600	Full coverage, depth markers, photo documentation, 365-Day Done Right Promise
Full attic, 2,000+ sq ft, R-49	$1,800 – $2,800	Full coverage to R-49, air sealing, vent covers for recessed lights if needed
Old insulation removal + new blown-in	$2,500 – $4,500+	Removal of old batt or blown-in, attic cleanup, new blown-in to R-49

What moves the price:

• Square footage of the attic floor. This is the biggest driver. More area, more material and more labor.
• Depth of existing insulation. A top-off is cheaper than a full job, but only if your existing insulation is in decent shape and not compacted or water-damaged.
• Condition of the attic. If we find old rodent nests, mold, or water damage, that needs to be handled before new insulation goes in. We’ll tell you what we find and give you a separate written price for any remediation work. No surprise charges.
• Access difficulty. Steep roof pitches, very low attics, or attic hatches in tight closets add some labor time.
• Air sealing scope. Basic sealing around plumbing stacks and electrical penetrations is included. More extensive air sealing around ductwork or chimney chases is quoted separately.

We give you a written price before any work starts, so you know exactly what you’re paying. No square footage surprises at the end of the job. Call (254) 279-0971 for a free estimate.

If you want to compare, our full Attic Insulation in San Antonio page breaks down pricing across all insulation types we install, including spray foam and batt.

Blown-In Fiberglass vs. Cellulose: What We Recommend

Both products work well in San Antonio’s climate, but they have different strengths. Here’s how we present it to homeowners:

Cellulose (GreenFiber)

Made from recycled paper treated with borates for fire resistance and pest resistance. Cellulose has a slightly higher R-value per inch (about R-3.7 per inch versus R-2.5 to R-3.0 for fiberglass). It also does a better job blocking air infiltration because the fibers pack more densely. In older San Antonio homes with leaky attic floors, we often recommend cellulose for this reason.

Fiberglass (CertainTeed)

Lighter weight than cellulose, which matters if your ceiling drywall is older or you have any concerns about weight. CertainTeed blown-in fiberglass is also non-combustible and won’t settle as much as cellulose over the first few years. It’s the most common choice for top-off jobs.

Both materials are included in our standard pricing. We’ll match the product to your attic’s specific conditions and your budget, not to whatever happens to be loaded on the truck that day.

Air Sealing: The Step Most Insulation Companies Skip

Blown-in insulation without air sealing is like putting a heavier blanket on a drafty bed. You’ll feel some improvement, but you’re still losing conditioned air. In San Antonio, the biggest air leaks we find are around plumbing penetrations, recessed lights, and the attic hatch itself.

Before we blow insulation, we seal those penetrations with caulk or spray foam where accessible. For recessed lights, we install a protective cover if the fixture isn’t rated for insulation contact. This is a safety issue: some older recessed fixtures can overheat if insulation is piled directly against them, which is a fire risk. We’ll identify any fixtures that need covers and include them in your written quote.

We also check that your soffit vents are not blocked. Blown-in insulation can easily bury soffit vents and choke off attic ventilation, which leads to moisture buildup and mold. We install baffles where needed to keep air moving. This is standard practice on every blown-in job we do, not an upsell.

How Blown-In Insulation Affects Your CPS Energy Bill

Here’s what we see in real numbers. A 2,000 square foot home in San Antonio with R-19 attic insulation in August will run the AC roughly 14 to 16 hours per day during peak heat. That same home with R-49 blown-in insulation sees the AC run 10 to 11 hours per day. The difference is hundreds of dollars over a single summer.

Most homeowners report a 15% to 25% reduction in cooling costs after upgrading attic insulation to R-38 or higher. The payback period in San Antonio is typically three to five years, depending on your usage patterns and how much you run your AC. Homes in Leon Valley and Helotes, where afternoon sun exposure is more direct, tend to see faster payback.

CPS Energy also runs rebate programs periodically for insulation upgrades. We’ll help you check whether your project qualifies when we come out for the estimate.

Scheduling and What to Expect on Installation Day

You’ll get a live arrival time, not a window. Our technicians are background-checked and uniformed. They’ll lay down floor protection from the entry to the attic hatch, run the hose from the truck, and get to work. The whole job usually takes two to four hours for a standard attic.

During installation, you’ll hear the blower running. It’s loud, like a leaf blower in the attic. You won’t need to leave the house, but if you work from home, you may want to schedule calls around the noise. We’ll give you a heads-up before the blower starts.

After we finish, you get photos of the finished attic in your digital invoice. You can pay from the link, no check-writing. And we don’t disappear; your 365-Day Done Right Promise is in writing on every job.

FAQs – Blown-In Attic Insulation

How much does blown-in attic insulation cost in San Antonio?

Most blown-in attic insulation jobs in San Antonio cost between $1,100 and $2,800, depending on attic square footage, the R-value you’re targeting, and whether old insulation needs removal first. Top-off jobs run $700 to $1,200. Call (254) 279-0971 for an exact quote, estimates are free.

Can you install blown-in insulation the same day?

Yes, in most cases we can schedule and complete blown-in attic insulation within the same week, often within 48 hours. Installation itself takes two to four hours for a standard attic. Call (254) 279-0971 to check current scheduling.

Is blown-in insulation better than batts?

For most San Antonio attics, blown-in insulation performs better because it fills gaps and creates a continuous thermal layer without seams. Batts leave gaps around ducts, wiring, and recessed lights, and they lose R-value when compressed. Blown-in also installs faster.

How much can I save on my electric bill with blown-in insulation?

Most San Antonio homeowners see a 15% to 25% reduction in summer cooling costs after upgrading attic insulation to R-38 or higher. On a $300 monthly CPS Energy bill, that’s $45 to $75 per month during cooling season. Call (254) 279-0971 to get a free estimate specific to your home.

Do you remove old insulation before blowing in new?

Only if it needs removal. If your existing insulation is dry, mold-free, and not compacted, we can blow new insulation directly over it. If we find water damage, rodent contamination, or mold, we’ll give you a separate written quote for removal. We don’t sell removal you don’t need.

Is blown-in insulation safe around recessed lights?

Blown-in insulation is safe around recessed lights when proper covers are installed over fixtures that are not IC-rated. Older recessed fixtures can overheat if insulation is piled directly against them, which is a fire risk. We inspect every fixture and install protective covers where needed as part of the job.

How long does blown-in insulation last?

Blown-in fiberglass and cellulose both last 20 to 30 years when installed correctly and kept dry. Cellulose settles slightly in the first year, which is why we install it slightly above target depth. After that, performance is stable. Your 365-Day Done Right Promise covers any workmanship issues in the first year.

Get a Free Blown-In Attic Insulation Estimate in San Antonio

If your upstairs is hot, your energy bill is climbing, or you can see bare joists in your attic, let’s fix it. Call Laurel Attic Insulation San Antonio at (254) 279-0971 and we’ll schedule a free attic inspection. You’ll get a written price before anything starts, a live arrival time, and photo proof of the finished job. No pressure, no surprises, no vague promises. Just insulation done right, in writing.

Written by Chase Whitaker, Owner at Laurel Attic Insulation San Antonio, serving San Antonio.