Fast, Reliable Attic Insulation Across Marietta
Most attic insulation jobs in a Marietta ranch or split-level run between $1,800 and $4,200, and our crews complete the work in one day. We know the housing stock here because we have spent nine years working through it, block by block, from the Lockheed-era ranches east of the Square to the 1990s brick-front subdivisions off Barrett Parkway. Call (218) 261-7714 and we will give you a written price before anyone pulls the attic hatch.
Marietta’s mid-century homes share a fingerprint: settled rock wool compressed to under R-11, zero air sealing at top plates and can lights, and attic temperatures that exceed 150°F in July. That is not a one-off problem. It is the template for thousands of homes built fast during the Lockheed worker boom, and fixing it correctly means sealing first, then insulating, then documenting the result. We do all three, in that order, on every job.
Why Topside Attic Insulation Is Marietta’s Preferred Attic Insulation Company
We have insulated over 9,000 homes since 2016, and a large share of those sit in Cobb County. Marietta homeowners call us because we publish before-and-after blower-door numbers on every applicable job. That is a pressurization reading showing, in one figure, how much conditioned air the home was losing before and after our work. A typical 1960s ranch near Dobbins Air Reserve Base reads 4,000 to 5,000 CFM50 before air sealing and drops to under 2,500 after. You see the performance change you paid for, in writing.
Our crews serve Marietta directly, with dispatch coordinated from the Atlanta office. When you schedule, you get a named technician and a text when they are on the way. A live person answers the phone at (218) 261-7714, 24/7. No voicemail loops.
Under Haven Standard Clause 1, every job starts with a written price, a written scope, and a written warranty, before anyone lifts a tool. That has been our operating rule since Wes Okafor founded the company in 2016. It is why homeowners who read the three-star reviews as carefully as the five-star ones tend to call us.
Our Attic Insulation Services in Marietta
Blown-In Attic Insulation
For Marietta homes with open attic floors, blown-in fiberglass or blown-in rock wool gets the fastest, most uniform coverage. We typically blow to R-38 in Zone 3A, which for most Marietta attics means 13 to 15 inches of Owens Corning AttiCat or Johns Manville Climate Pro. In the ranch neighborhoods off Roswell Road and Sandy Plains, where the original rock wool has slumped to under 4 inches, we remove the failed material first, then air-seal, then blow to code-plus depth.
Attic Batt Insulation
Batt insulation works where blown-in is impractical: vaulted ceilings, knee walls, and attic hatches. We use Knauf and CertainTeed R-30 or R-38 batts in Marietta homes with low-slope roofs or finished attic bonus rooms. In 1980s and 1990s subdivisions around East Cobb, batts also make sense for topping off shallow joist bays where vent baffles limit blown coverage.
Attic Insulation Top-Up
A top-up adds new insulation over existing material that is still dry, clean, and performing. In Marietta, most 1980s and newer homes fall into this category: blown fiberglass from the original build, now settled to R-19 or R-24, with no moisture damage. We air-seal the attic floor penetrations first, because adding insulation over unsealed bypasses just hides the leak. Then we blow fresh fiberglass to bring the total to R-38 or R-49. Most Marietta top-ups run $1,200 to $2,600.
Attic Insulation Replacement
This is the service we perform most often in the Lockheed-era ranch homes east and north of Marietta Square. The original rock wool or fiberglass, installed in the 1950s or 1960s, has compressed to under R-11, absorbed decades of humidity, and in many cases is contaminated with rodent droppings. We remove it completely, sanitize if needed, air-seal every penetration, then install fresh blown-in insulation to R-38 or R-49. Replacement runs $2,200 to $4,800 in Marietta depending on attic size and contaminant load.
Attic Baffles and Ventilation Prep
Baffles are the rigid foam or plastic channels that keep soffit vents open when insulation is blown deep. Homes insulated in the 1960s and 1970s rarely got baffles, which is why so many Marietta attics have blocked soffit ventilation. We install baffles at every rafter bay before blowing insulation, so summer heat leaves the attic and winter moisture cannot condense on the roof sheathing. On a 1,300 sq ft ranch, expect 30 to 40 baffles and a cost of $300 to $600. For more on how this fits the full scope of work, see our Attic Insulation service page.
What happens when you call
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A real person answersNo phone trees - you reach a local pro.
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You get an upfront price rangeHonest numbers before anyone is dispatched.
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A background-checked tech heads outLicensed & insured, dispatched right away.
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You approve before work beginsNothing starts until you say go.
Trusted Brands We Service in Marietta
We stock Owens Corning AttiCat blown-in fiberglass, along with Johns Manville and Knauf batts, so most Marietta jobs start without waiting on a supply run. Our materials come from manufacturers with published third-party testing: no proprietary lock-in, no house-brand substitute. If you have a written estimate from another Marietta contractor, bring it to us. Under Haven Standard, we will read it with you and give you a free second opinion. Our Attic Insulation in Marietta team works with these materials daily and can tell you exactly what your attic needs, in writing, before you spend a dollar.
Common Attic Insulation Problems We See in Marietta Homes
- Settled rock wool in 1950s-1970s ranch attics. The Lockheed worker homes around Dobbins and east Marietta were insulated with rock wool blown to about R-11 at 4 to 6 inches. Sixty years of settling and humidity have compressed it to 2 to 3 inches, leaving ceilings that radiate 140°F heat into living spaces every July afternoon.
- Missing air sealing at top plates, can lights, and plumbing chases. In Marietta’s mixed-humid climate, these attic bypasses pull conditioned air out of the house and humid air into the attic. The result is mold on roof sheathing and higher cooling bills, even in homes with “adequate” insulation depth.
- No baffles, blocked soffit vents. Insulation installed decades ago without vent baffles blocks airflow at the eaves. In Marietta’s climate, that means hot, moist air trapped in the attic in summer, and condensation on roof decking in winter.
- Fiberglass batts sagging in vented crawl spaces. While this is technically below the attic, it affects the same older Marietta homes. Ground moisture wicks into batts stapled between floor joists, they sag under their own weight, and R-value drops within a few years. Encapsulation is often the real fix for homes off Canton Road and Sandy Plains.
Pricing for Attic Insulation in Marietta, GA
Here are real numbers for the Marietta market, based on the work we have completed across Cobb County:
| Service | Typical Marietta Range | Home Size |
|---|---|---|
| Attic Insulation Top-Up (air sealing included) | $1,200 - $2,600 | 1,000 - 1,800 sq ft |
| Blown-In Insulation (new install to R-38) | $1,800 - $3,400 | 1,200 - 2,000 sq ft |
| Full Replacement (remove failed material, air-seal, R-38) | $2,200 - $4,800 | 1,200 - 2,200 sq ft |
| Attic Baffles + Ventilation Prep | $300 - $600 | Added to any of the above |
Every line item above includes the air sealing that should have been done before the original insulation ever went in. That is not an upsell; it is the part that actually makes the numbers move on your bill. Call (218) 261-7714 and we will give you a written price on the first visit. No bidding war, no waiting a week for a number.
We Serve Cities Near Marietta
Topside Attic Insulation crews serve Marietta and the surrounding north metro, including Smyrna, Atlanta, Roswell, and Alpharetta. If you are in one of those cities and your attic has the same Lockheed-era fingerprint, the same crew shows up with the same written-price rule. Scheduling is coordinated from the Atlanta office.
Serving Marietta, GA - Our Local Coverage Area
We’re based in the Marietta 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 - Attic Insulation in Marietta
Because the original rock wool or fiberglass was installed at only 4 to 6 inches in the 1950s and 1960s, and six decades of settling, humidity absorption, and gravity have compressed it to 2 to 3 inches. That leaves the effective R-value under R-11, well below the R-38 minimum for Zone 3A. Call (218) 261-7714 and we will measure exactly what is in your attic, in writing.
If the old insulation is dry, clean, and not compressed beyond usefulness, we can top it up. But in most Lockheed-era ranches we enter in Marietta, the material has absorbed decades of Georgia humidity and is often contaminated with rodent waste. In those cases, removing it first and air-sealing the attic floor is the only way to get a real performance result. We will show you photos of exactly what we found before we recommend either path.
Baffles keep the soffit vents open so outside air can flow through the attic, which carries summer heat and moisture out. In Marietta’s Zone 3A climate, without baffles, blown insulation blocks those vents, trapping hot air in July and condensation in January. We install baffles as standard prep before any blown-in insulation job.
Attic insulation is half the fix. Ice dams form when warm air from the house leaks into the attic, melts snow on the roof deck, and the melt refreezes at the cold eaves. Sealing the attic bypasses and bringing insulation to R-38 reduces that heat transfer dramatically, but ventilation matters too. We address both in every attic job, which is why our blower-door numbers come with a full scope, not just a depth target.
Because these homes repeat the same construction details block after block: same joist spacing, same top plates, same can-light placements, same rim joist issues. A crew that has worked hundreds of these homes can pre-quote the scope before pulling the hatch and knows exactly where the air leaks will be. Generic installers discover problems mid-job. We know them before we arrive. Call (218) 261-7714 for a written estimate.
Contact Topside Attic Insulation in Marietta
If your Marietta home has a 1950s, 1960s, or 1970s attic that has never been properly air-sealed and insulated, the fix is straightforward and the payoff shows up on your next Georgia Power bill. Call (218) 261-7714 today and we will schedule a visit, give you a written price before any work starts, and document the entire job when we leave. Under the 365-Day Done Right Promise, if it is not done right, we make it right.
Written by Wes Okafor, Owner at Topside Attic Insulation, serving Marietta since 2016.
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