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Understanding Your Options
What Is Blown-In Attic Insulation and Is It Right for Your Home?
Blown-in insulation is loose-fill material, cellulose or fiberglass, machine-blown into your attic space. It conforms to every surface and fills every void, making it the go-to choice for most existing attics and retrofit projects.
Best for most attics
Blown-In Insulation
Fills every gap, cavity, and irregular space
Even R-value distribution across the entire attic
Installed in one day, most homes in 3–5 hours
Ideal for existing attics and retrofit projects
Works around wiring, plumbing, and obstructions
Batt Insulation
Fills every gap, cavity, and irregular space
Even R-value distribution across the entire attic
Installed in one day, most homes in 3–5 hours
Ideal for existing attics and retrofit projects
Works around wiring, plumbing, and obstructions
Not sure which is right for your attic? Every attic is different. During your free inspection, we’ll assess your space and recommend the insulation type that makes the most sense for your home’s layout, condition, and budget. Master Attic installs both blown-in and batt insulation.
Why Blown-In
One Upgrade. Six Benefits You'll Notice Every Single Month.
Lower Energy Bills
Most homeowners see a 20–40% reduction in heating and cooling costs after proper attic insulation. The upgrade often pays for itself within 2–3 years.
Comfort Right Away
Feel the difference as soon as the job is done. No waiting weeks for results, your home’s temperature evens out right away.
Complete Coverage
Blown-in insulation reaches every corner, junction box, and irregular space, eliminating the hidden gaps that waste energy.
Fast Installation
Most blown-in attic insulation jobs are completed in a single day, typically 3–5 hours with minimal disruption to your household.
Rodent Proofing Included
We seal entry points and rodent-proof your attic as part of the job keeping critters out and your insulation intact for years to come.
Year-Round Performance
Proper insulation keeps heat in during winter and out during summer. Your HVAC runs less, lasts longer, and your home stays comfortable 365 days a year.
Our Process
How Our Blown-In Insulation Process Works
From inspection to completion, here’s exactly what to expect.
1
Free Attic Inspection
We assess current insulation, check for air leaks, moisture, and rodent activity, then give you a clear recommendation with upfront pricing.
2
Old Insulation Removal
If your existing insulation is damaged, contaminated, or infested, we remove it completely using professional vacuum equipment.
3
Seal & Protect
We lay down protective plastic and seal off your living space so nothing contaminates your home. Then we seal air leaks and rodent-proof entry points.
4
Professional Install
Our crew machine-blows insulation to the precise R-value your attic needs. Even coverage, no gaps, no shortcuts.
5
Final Walkthrough
We show you the completed work, verify R-value depth, and clean up completely. You’ll feel the difference that night.
Master Attic did a phenomenal job with our attic insulation and duct replacement. We had a loss from smoke damage from a neighboring fire and we were met with compassion and excellent customer service from Danny Jones and Jorge Diaz. We chose them for their quality of work, expertise and fair pricing and they got the job done promptly. Thank you for the excellent work and we will be recommending you highly!
Iris ZJune 1, 2026
★★★★★Rated 5 out of 5
We just had our attic insulation replaced, and the entire experience was pleasant from start to finish. Robert is knowledgeable, honest and easy to work with at the initial estimate period. Roberta and his crew did a great job replacing the attic insulation for our house. They were very professional, efficient and respectful. They did everything that needed to be done and left the space clean and in excellent condition. I am very happy that I chose Master Attic and would highly recommend them.
James McAleerMay 29, 2026
★★★★★Rated 5 out of 5
Dan Jones and the Ronald crew did a great job from start to finish! I had original insulation in my attic with no electricity, not an easy job. Our upstairs was very hot in the summer and cold in winter. With having central air, we still needed AC units and space heaters to manage. Dan set up a great plan to eliminate that. He and his crew were able to come and finish the job shortly after we first met. They were quick, clean and managed to crawl into small spaces to remove old insulation and install fresh insulation. We have already noticed a major difference! Highly recommended!!
Mary HowardMay 24, 2026
★★★★★Rated 5 out of 5
We hired Master Attic to clean out debris, mice, old insulation, and replace with new insulation in both our attic spaces. Roberto and his crew did a phenomenal job. They were extremely professional, polite, and did a fantastic job. They invited my husband to see the attic after each step, and took pictures on their phone to show me since I could not get up in the attic. They took the time to protect the space with plastic sheeting before the job up in the attic, and then cleaned up everything perfectly afterwards. I highly recommend them!
PetlorMay 5, 2026
★★★★★Rated 5 out of 5
Great job by the team. Cleaned out the entire attic and replaced all the old insulation with new fresh insulation. Made a huge difference.
Alex was great to work with and was very professional. Would highly recommend.
Steven CApril 29, 2026
★★★★★Rated 5 out of 5
Awesome experience from start to finish. Rob provided a great assessment and capabilities overview, arrived on time and was very generous and thorough in explaining the work. I signed on the spot. A crew of six arrived (again, on time) and completely transformed our attic space - thoroughly cleaned out the old insulation (looked spotless afterwards), sanitized the space, sealed it/rodent proofed it, added baffles and of course, replaced the insulation and added more in areas that needed it. Completed the whole job in half a day and we are delighted with the result. Thank you, Master Attic team, for a job very well done! Highest recommendation.
celineMarch 8, 2026
★★★★★Rated 5 out of 5
What a great experience I had with this company and its employees. It started with initially interacting with Joe who came out for the estimate. He was funny because he came down from my attic and said "have you seen up there". I laughed because I had and I knew it was bad. He was no pressure and no nonsense. Gave me an estimate and said if I wanted we could have the work done next day. I wasn't ready for that but after some schedule juggling I told him we could be ready. Joe had his guys out next morning with the best part being Jorge calling me to advise he was about thirty minutes out. I appreciate when I am given a heads up as to ETA. Three of them arrived Jorge set out plastic and covered exposed furniture. Jorge, Angel and Gonzalo were all polite and worked hard to complete the task. They worked efficiently and were done quickly. Jorge made sure he included me in each step of the process and when I saw the finished product I was amazed. I can actually use my attic for storage if I choose to do so. I did not realize when they were here that they also do work on crawlspace areas. I will be calling them back to see what they can do for my crawlspace which easily rivals the diasaster called my attic. I recommend at least giving this company and its employees an opportunity to help you.
Rick LuessenOctober 30, 2025
★★★★★Rated 5 out of 5
Great company to work with. From beginning to end, Dan came out, spent plenty of time with me going over everything that needed to be done, and the process of everything that needed to be updated it both attics. His professionalism was top notch, answered all my question and concerns. When it came time for George and his six-man crew to do the work their quality of workmanship was well above average, they were here the whole day, and I don't think they even had a lunch break (hopefully I don't get him in trouble). They all worked and everyone knew what their job was, they removed all the insulation, cleaned, spray foamed all holes and top plates, re-insulated both attics and cleaned up like they weren't even here. Will definitely use them again.
Tiffany HathawayApril 13, 2026
★★★★★Rated 5 out of 5
Master Attic remediated a bat issue for us back in October and I can’t say enough about what a wonderful job they did. The work was guaranteed and they encouraged us to call if we say any further evidence of bats. Well, there were a few droppings in the attic and they quickly responded to our concerns. Jose’s crew came out on a SUNDAY, inspected the attic, and sealed up several spots that could be entry points. They were professional, efficient, and kind. I would highly recommend them. You will not be disappointed.
Areas We Serve
Blown-In Attic Insulation Across NJ, PA & DE
Master Attic provides blown-in attic insulation, old insulation removal, and rodent proofing to homeowners across New Jersey, Eastern Pennsylvania, and Delaware. Our crew can typically schedule your install within the week.
Toms River
Brick
Jackson
Lakewood
Howell
Freehold
Woodbridge
Middletown
Edison
Old Bridge
Monroe
Manalapan
Marlboro
East Brunswick
Princeton
Cherry Hill
Hamilton
Paramus
Wayne
Piscataway
NJ
Serving All of New Jersey
From North Jersey to the Shore we’ve got your attic covered.
FreeEstimates
5.0Google Rating
10+Towns Served
FAQ
Frequently Asked Questions
Answers to the questions we hear most from NJ homeowners.
How much does blown-in attic insulation cost in NJ?
It depends on the size of the attic, how much insulation is already there, the material chosen (cellulose or fiberglass) and any prep the space needs, such as air sealing or old-insulation removal. Every project starts with a free on-site estimate, and the written quote covers the whole job so there are no surprises.
Is cellulose or fiberglass blown-in insulation better?
Cellulose: Made of recycled paper treated for fire resistance. It has a higher R-value (insulating power) per inch and is better at blocking air leaks and sound. Fiberglass: Made of spun glass. It’s naturally fire-resistant, doesn’t settle as much over time, and is generally more moisture-resistant than cellulose.
Do you remove old insulation before installing new?
Not always, but we remove it when: the old material is moldy or water-damaged; there is a history of rodent infestation (to remove droppings/pheromones); or you want to perform “air sealing” (plugging holes where wire/pipes go into walls) before adding new layers.
Do you rodent-proof the attic too?
Yes. As part of the job we protect your insulation by sealing entry points with steel wool or hardware cloth, sanitizing the area if there was a previous infestation, and using borate-treated cellulose, which acts as a natural deterrent to many pests.
How long does blown-in insulation last?
Under ideal conditions, it can last 20 to 30 years. However, its effectiveness can decrease if it settles significantly or gets compressed. Fiberglass tends to stay “fluffy” longer, while cellulose may settle by about 20% over a decade, slightly reducing its R-value.
Is blown-in or batt insulation better for my attic?
Blown-in is almost always better for attics. Batts (the big blankets) are hard to fit around joists and wires, leaving “thermal bridges” where heat escapes. Blown-in creates a seamless monolithic layer that fills every nook and cranny, providing much better coverage.
How long does installation take?
For a standard NJ attic (approx. 1,000–1,500 sq. ft.), the actual blowing process usually takes 2 to 4 hours. If you include prep work and old insulation removal, it can become a full-day job (6–8 hours).
From the Blog
Attic & Crawlspace Tips From Our Experts
Insulation, energy savings, and rodent-proofing advice from the Master Attic team.
Get a free attic inspection and blown-in insulation estimate from Master Attic. No pressure. No obligation. Just honest answers about what your attic needs.
