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TRUSTED BY BLACK DIAMOND, WA HOMEOWNERS

  • Average homeowner rating star icon4.6
    Average homeowner rating
  • Verified reviews icon291
    Verified insulation services reviews

Top-Rated Insulation pros in Black Diamond - Updated Nov 2026

Avatar for PNW Insulation, LLC
PNW Insulation, LLC
4.7(
256
)
Spray Foam Insulation - InstallBlown-In Insulation - Install or UpgradeBatt, Rolled or Reflective Insulation - Install or Upgrade

Serving Black Diamond, WA and surrounding areas

Approved

In business since 2015

Free estimates

Warranties offered

"PNW Insulation completed many insulation tasks on a house for me including wall insulation, crawl space and attic. They were very accommodating with scheduling the work at various times as each area was ready. I highly recommend them."
Before
All insulated
Final with Wmp
Getting ready to start
Inside office

+22

Response time1 day
Response rate93%
47 neighbors recently requested a quote
Avatar for Lake Atitlan Insulation, LLC
Lake Atitlan Insulation, LLC
5.0(
20
)
Blown-In Insulation - Install or UpgradeBatt, Rolled or Reflective Insulation - Install or Upgrade

Serving Black Diamond, WA and surrounding areas

Approved

In business since 2021

Free estimates

Credit card accepted

"Lake Atitlan Insulation did an excellent job in my attic. They removed the old insulation, installed a solar attic vent, replaced the bathroom vent duct, and added new blown-in fiberglass insulation. They also installed radiant barrier on all the attic roof rafters. The work was completed professionally and thoroughly. I highly recommend them."
7 neighbors recently requested a quote
Recommended by5%of homeowners
Avatar for Madrona Insulation
Madrona Insulation
4.9(
68
)
Blown-In Insulation - Install or UpgradeBatt, Rolled or Reflective Insulation - Install or UpgradeSpray Foam Insulation - Install+2 more

Serving Black Diamond, WA and surrounding areas

Approved

In business since 2009

Free estimates

Warranties offered

"It went very well from the estimate process. Rory took the time to explain the process. As I had questions, he took the time to talk to me and explain in detail. Deb coordinated the scheduling extremely well. Among the estimates I got they were the most reasonably priced. I started out only doing the attic. They did such a good job, I decided to go ahead and have the crawlspace insulated as well by Madrona Insulation. BTW, shout out to a terrific installation crew!"
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4 neighbors recently requested a quote
Recommended by96%of homeowners
Madrona Home Services, LLC
4.7(
74
)
Batt, Rolled or Reflective Insulation - Install or UpgradeBlown-In Insulation - Install or Upgrade

Serving Black Diamond, WA and surrounding areas

Approved

In business since 2010

Free estimates

Customers say: Quick response

"We had a wonderful attic insulation experience with Madrona Home Services! They had the best pricing, including the Puget Sound Energy discount and they managed all the paperwork. We were able to schedule two weeks after the quote, and their team worked fast and efficiently on installation day. They removed old saw dust insulation and laid down batting, as well as going above and beyond by creating an 8x8 storage platform. Our house feels noticably cozier with consistent temperatures. 10/10"
Response time1 day
5 neighbors recently requested a quote
Recommended by100%of homeowners
A G INSULATION LLC
5.0(
10
)
Batt, Rolled or Reflective Insulation - Install or UpgradeBlown-In Insulation - Install or Upgrade

Serving Black Diamond, WA and surrounding areas

Approved

In business since 2024

Free estimates

Credit card accepted

A G INSULATION LLC is committed to excellence in every aspect of our business. We uphold a standard of integrity bound by fairness, honesty, and personal responsibility. Our distinction is the quality of service we bring to our customers. Accurate knowledge of our trade combined with ability is what makes us true professionals. Above all, we are watchful of our customers' interests, and make their concerns the basis of our business. \n

Recommended by22%of homeowners
Avatar for WASHINGTON RETROFOAM LLC
WASHINGTON RETROFOAM LLC
4.8(
6
)
Injection Insulation - Install

Serving Black Diamond, WA and surrounding areas

Approved

In business since 2020

Free estimates

Warranties offered

"My 1959 home with unique siding presented specific challenges on this job. Some of the plug work done was PERFECT, and much of it was not, resulting in unsightly exterior appearance and challenging sanding and finishing being required by me, the homeowner. This company COULD have done all the plugs perfectly, but chose not to do so. In addition, I had to request a receipt for the work, and I was not provided with a written copy of the verbal warranty stated by the owner of the company."
My jobs
My jobs
My jobs
My jobs
My jobs

+22

Response time2 days
Response rate100%
13 neighbors recently requested a quote
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Insulation FAQs, answered by experts

Several types of insulation are effective for crawl spaces, with spray foam and rigid foam boards being two of the best options. Closed-cell spray foam insulation is a strong choice because it effectively repels moisture, resists biological growth, seals the air, and provides excellent thermal protection, especially in hard-to-reach areas. Rigid foam insulation boards are another excellent material as they insulate well, resist water damage, and will not settle over time like fiberglass or cellulose.

Unfortunately, pipes can freeze when exposed to prolonged freezing temperatures, whether or not you have installed insulation covers. Insulation covers, however, are still an excellent idea as they can reduce the chance of your pipe freezing by keeping the pipes closer to the temperature of the water inside the pipe.

Whether you should remove old insulation before blowing in new insulation depends on your particular situation. Fiberglass insulation attracts insects and mold over time, so if it has been decades since your last insulation upgrade, consider removing the old materials before placing the new ones. However, most types resist mold, insects, and mildew, so once you get the go-ahead from your contractor that your space is free from all three, feel free to install the new insulation directly on top of the pre-existing materials.

Bubble wrap is better for moving since it can be cut to size, whereas dish foam comes in precut sheets that are harder to manipulate. However, if you’re packing items like dishes, wine glasses, picture frames, or mirrors, dish foam will protect them better. Ensure you measure your box beforehand so you know what size dish foam to purchase. 

Heat lost through uninsulated basement walls can account for up to 30% of the total energy lost through heat transfer to the outdoors. While homes in mild climates won't gain as much benefit from having an insulated basement as those in cold climates, the effects are still noticeable on your energy bill.

The Black Diamond, WA homeowners’ guide to insulation services

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