
Serving Ottawa, IL and surrounding areas
Approved
In business since 1975
Free estimates
Offers commercial services
"Slagel insulation provided the work that was asked of them. I would hire them back."





+13


Serving Ottawa, IL and surrounding areas
Approved
In business since 1975
Free estimates
Offers commercial services
"Slagel insulation provided the work that was asked of them. I would hire them back."





+13

Serving Ottawa, IL and surrounding areas
Approved
In business since 2004
Free estimates
Emergency services offered
"Devan, Lauren and Brendan were my main points of contact with Home Genius Exteriors and they showed professionalism and personality throughout the whole process. Both Brendan and Devan spent time taking to me, even after our business was concluded, this was an exceptional experience and I highly recommend Home Genius Exteriors and all their employees."

Serving Ottawa, IL and surrounding areas
In business since 1948
Emergency services offered
Credit card accepted
"when we noticed that the insulation in our attic was wet, we called Home Comfort. They came, look at the insulation, confirming it was wet and we had mold in our attic. They removed the wet insulation, put in new insulation after the mold was abated. The also added more vent tiles in the attic and sprayed insulation around the sole plates in our basement."

Serving Ottawa, IL and surrounding areas
In business since 1948
Free estimates
Emergency services offered
"The team were very professional, owner came at end of day to check up on quality of job (I asked him to look at my attic insulation, he could have easily conned me into paying for more - he didnt, and told me I didnt really need it... he found another insulation issue but recommended I solve it DIY style!)... so he wasnt interested in the $$$$.... Once he found I was happy with work he left me an invoice, no pressure to pay on the spot. The work has done exactly what he promised and I can recommend using them."

Serving Ottawa, IL and surrounding areas
In business since 2000
Emergency services offered
Warranties offered
"Neil did the job fantastically and explained what he was doing throughout, always asked for an inspection to make sure it was done to my satisfaction. Pricing was extremely fair and he was timely and quick. Would highly recommend for any insulation work you need done. Can’t speak on the other work he does, but if it’s on par with what he did for me, then you’d be doing well."





+11

Serving Ottawa, IL and surrounding areas
In business since 2019
Free estimates
Credit card accepted
"USA Insulation did a excellent job in insulation the whole house. Great crew that really worked well together. We will recommend this company to family and friends. Home is warmer and outside noise is a lot less."





+2

Serving Ottawa, IL and surrounding areas
In business since 1978
"This service went above what was expected. They fixed issues that came up and needed attention without altering the original bid. I will recommend them to anyone needing insulation."

Serving Ottawa, IL and surrounding areas
In business since 2025
Free estimates
Emergency services offered
"I hired this company to do Blown in insulation in my attic, the job was done very efficiently, as well as professionally, the workers were very diligent in duties as well as very respectful. I recommend this company."





+4
Serving Ottawa, IL and surrounding areas
In business since 2017
Free estimates
Small jobs welcome
We are a local family owned and operated Insulation company. We service North Riverside area and the surrounding communities. With over 10 years of experience, let us ensure your home is properly insulated and save money on your energy every month. You can thank us after for all the money we are going to save you on energy costs.\n

Serving Ottawa, IL and surrounding areas
In business since 1998
Free estimates
Credit card accepted
"I know of no other contractor who has total customer satisfaction as his top priority like Mr. Flanagan does. He is absolutely the best.
My basement sustained ankle-deep water as the result of an outdoor basement stairwell drain that violently backed up because its circa-1951 drain line led to the street storm sewer (by design). That sewer was overcome with water during a storm in the summer of 2010 that featured a tornado in my western-suburbs area. Soon after pumping the water out of my basement with a mobile pump, the mess prompted me to (once again*) call Mr. Flanagan (*His crawlspace crew had done a beautiful job finishing my dirt-floor crawlspace with a concrete floor and wall insulation a couple of years earlier).
After the basement waterproofing project described in this review was complete, however, I was disappointed with the workmanship: The concrete work looked less-than-professional (out-of-flush with sump flange and the stairwell drain, plus way too many swirl marks and splattering) in the stairwell and basement's appearance areas. In short, it just didn't look like his business's flawless concrete job that was done in my crawlspace just years earlier.
Mr. Flanagan agreed. With no questions asked, he immediately had a different crew come to my home, tear out all of the previously laid concrete and drain lines and replace it with the workmanship that he would expect his crews to use in their own homes. The re-do of the project at least had met my high expectations for its cosmetics. And, of course, I hoped it was a sufficient waterproofing solution for my basement.
Fast forward just a few short years. Affter having perhaps sustaining that 100-year event with the Chicago-area rain storm of April 17-18, 2012, while my neighbors are pumping water out of their basements, mine remains bone dry. Thank you Mr. Flanagan and Crawlspace / Basement Waterproofing Solutions for a job (design and installation) well done. Your basement waterproofing solution indeed deserves an A+.
"





+13
Old insulation should be removed when it shows damage, contamination, or heavy deterioration. If you notice water stains, rodent droppings, mold, or large gaps, plan on taking it out to protect your home’s energy performance and indoor air quality. Removing compromised material eliminates health hazards, cuts energy loss, and sets the stage for a safer, more efficient attic—all while keeping utility bills in check.
R-value measures how well insulation resists heat flow—the higher the number, the better it slows heat transfer. The right R-value keeps your home warmer in winter and cooler in summer, saving energy year-round. Match the rating to your climate zone and have a pro verify performance over time, because moisture or settling can lower R-value and cut efficiency.
Attic insulation can stay in place for 80 to 100 years, but its performance often drops after the first 15. As dust, moisture, or mold build up, the material loses R-value and allows heat to escape. Schedule periodic inspections so a pro can tell you when replacement makes sense—helping you keep energy bills down and indoor comfort up.
You can over-insulate an attic. Beyond the recommended R-value, extra layers don’t add efficiency and can trap moisture, leading to mold or reduced performance. A local insulation pro can measure current levels, confirm the right target for your climate, and advise on any adjustments so you avoid future energy or maintenance headaches.
Insulation can be damaged by mold, pests, water leaks, or accidental electrical contact. When the material is compromised, it loses R-value and can introduce health hazards. Removing and replacing affected sections restores efficiency, while routine inspections from a qualified pro help you catch problems early and keep your attic safe and energy-smart.
From average costs to expert advice, get all the answers you need to get your job done.

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