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TRUSTED BY CALIFORNIA, MD HOMEOWNERS

  • Average homeowner rating star icon4.3
    Average homeowner rating
  • Verified reviews icon12
    Verified insulation services reviews

Find Insulation pros in California

Avatar for Home Genius Exteriors
Home Genius Exteriors
4.9(
435
)
Batt, Rolled or Reflective Insulation - Install or UpgradeBlown-In Insulation - Install or Upgrade

Serving California, MD and surrounding areas

Approved

In business since 2004

Free estimates

Credit card accepted

"Home Genius Exterior just completed phenomenal work at my property!! Windows and insulation done. â … Top notch service from the consultation, to the schedule work, the start of the tear down, the installing and the final clean up. Highly recommend this company for your home service. Thank you for the hard work and service!"
Roofing
Roofing
Roofing
Roofing
Roofing

+77

Recommended by86%of homeowners
Dave's Insulation
5.0(
2
)
Batt, Rolled or Reflective Insulation - Install or UpgradeInjection Insulation - InstallSpray Foam Insulation - Install

Serving California, MD and surrounding areas

In business since 2009

Free estimates

Credit card accepted

We specialize in insulation installation and upgrades as well as roofing repair. Each of our employees boasts over 20 years of industry experience! We take pride in commitment to the quality of work we produce, and the long-term relationships we build with our clients.\n\nWe guarantee quality and complete satisfaction, featuring a 10 year warranty at no additional cost on all of our services. We set ourselves apart from our competitors by offering the highest quality of work combined with experience, guaranteed. Find another company with a lower price and we will beat the competitor's price by 10%. Call today for a free estimate!

Response time2 hrs
Response rate90%
Recommended by100%of homeowners
Contractors Unlimited Co
5.0(
10
)
Batt, Rolled or Reflective Insulation - Install or UpgradeBlown-In Insulation - Install or UpgradeInjection Insulation - Install+2 more

Serving California, MD and surrounding areas

In business since 1989

Emergency services offered

"We had a horrendous situation with a basement floor installation that went wrong leaving our house full of fumes, and a week later we discovered our basement was contaminated by asbestos in the process.  When we called Bill and Contractors Unlimited, they were extremely responsive.  Although other companies gave us bids, Bill was able to work his schedule to fit us in weeks sooner than the others.  Although the cost was a bit more, that saved us money because we were displaced and could not even go into our house because of the fumes.  CU set up negative air machines to replace the air, they followed asbestos abatement laws, they cleaned every item that could be salvaged in our house.  They even saved more than we thought which really reduced our overall expense.  Bill and his team were extremely professional, friendly, helpful, and really went out of their way to ease our stress from this situation.  At the end of their process, Bill arranged for a air quality inspection which we happily passed - able to return home.  I would gladly recommend Contractors Unlimited for asbestos abatement.  I just wish we had called them before the floor guys  created such a disaster.  Thank you Bill!
"
Recommended by100%of homeowners
Avatar for Accurate Insulation
Accurate Insulation
3.5(
35
)
Batt, Rolled or Reflective Insulation - Install or UpgradeBlown-In Insulation - Install or UpgradeInjection Insulation - Install+2 more

Serving California, MD and surrounding areas

In business since 2004

Free estimates

Credit card accepted

"Fantastic work!  Fast, easy and professional.  These guys know what they are doing.  We also used Accurate Insulation last year when we bought the house, and they provided whole-house insulation to add to the original 1965 builder insulation.  They were able to provide advice on what would be too much insulation and could cause poor indoor air quality.  Would use them again anytime.
"
Recommended by75%of homeowners
Avatar for Go Green Incentive
Go Green Incentive
5.0(
6
)
Batt, Rolled or Reflective Insulation - Install or UpgradeBlown-In Insulation - Install or UpgradeInjection Insulation - Install+2 more

Serving California, MD and surrounding areas

In business since 2015

Free estimates

Emergency services offered

Our primary goal is to assist forward-thinking, thrifty individuals and businesses with the implementation of energy efficient services, ranging from energy audits to building automation. Contact us today to learn more about the many ways that we can reduce your individual or business carbon footprint and save money!

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Additional Photos

+3

Recommended by100%of homeowners
Avatar for American Home Shield – Home Warranty
American Home Shield – Home Warranty
3.5(
5,688
)
Batt, Rolled or Reflective Insulation - Install or UpgradeBlown-In Insulation - Install or UpgradeInjection Insulation - Install+2 more

Serving California, MD and surrounding areas

In business since 1971

Credit card accepted

"Roberto was the technician and he was very professional, polite, and personable. He inspected the rest of our system and told us things that needed to be changed or repaired. He showed me pictures of everything. Everything he told me about was accurate. He quoted me a price for R38 insulation , Some of our ducts were plastic and he recommended them to be changed. I agreed completely and didn't know they were plastic. I would have had them done the work but I had no price comparisons to make and besides I didn't have the money right then. So he just finished the vent cleaning and left his card. He did a great job on the vent cleaning and was happy with the work."
Additional Photos
Additional Photos
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Additional Photos
Additional Photos

+2

Recommended by65%of homeowners
Showing 1-10 of 35
Insulation questions, answered by experts

STC (Sound Transmission Class) is a rating that describes how well a building material or assembly blocks airborne sound. A higher STC rating means less noise will pass through the material, providing better sound reduction. This rating system applies to various building components, including windows, doors, flooring, drywall, and insulation.

For context, a typical single-pane window has an STC rating of around 25 (where normal conversations are audible), while a well-sealed, double-pane window can exceed STC 45 (blocking loud speech and most music). It is important to note that for some products, like soundproofing drywall, the STC rating refers to the entire wall system, not just the individual panel.

Additionally, STC ratings are most effective for measuring sound reduction at mid-to-high frequencies, such as human speech, and may not accurately reflect how well a material blocks low-frequency sounds like bass music or thunder. Because of these factors, it is recommended to consult a professional to determine the right STC-rated materials for your specific soundproofing needs.

The thickness of floor insulation will depend on the R-value you plan to achieve. R-value varies on the type of material as well as its thickness and density. Insulation materials with low R-values can be layered to match the value of denser materials. As long as your floor insulation is packed tightly, seals the area from drafts, and doesn’t prevent ventilation, it can be as thick (or thin) as you need.

Whether plaster walls should be insulated depends on whether the walls are at particular risk of moisture problems. In many cases, you can insulate plaster walls, while in others, it's a poor decision because of the lack of a vapor barrier. Choose a reputable insulation contractor to help you decide if and how to proceed to increase your home's energy efficiency.

You do not always need to remove old insulation before adding new. If the existing insulation is in good condition—not wet, physically damaged, moldy, or infested with pests—you can add new insulation directly on top of it for a compounding effect. You can also mix different types, such as adding blown-in insulation around existing fiberglass batts.

However, removal is recommended if the old insulation is compromised by water damage or pests. You should also remove it if you plan to install a different type of insulation, like switching from roll or batt insulation to spray foam. If the existing insulation is very old or damaged, you will likely get more benefit from removing it and starting fresh.

For your safety, you should always wear a mask when cutting batts of fiberglass insulation. We also recommend wearing eye protection, safety gloves, and long sleeves to protect your skin. Properly suiting up helps you avoid several fiberglass issues, such as cuts from the tiny shards of glass and inhaling small bits of fiberglass.

The California, MD homeowners’ guide to insulation services

From average costs to expert advice, get all the answers you need to get your job done.