Diamond Certified Companies are Rated Highest in Quality and Helpful Expertise.

  • Why this rating is the most accurate.
  • Our editors gather deep company info.
  • Performance is Guaranteed.

Diamond certified companies are top rated and guaranteed

Why Trust Diamond Certified Insulation Companies Rated Highest in Quality?

You are the customer. If your goal is to choose an insulation company that will deliver high customer satisfaction and quality, you’ll feel confident in choosing a Diamond Certified insulation contractor. Each has been rated Highest in Quality in the most accurate ratings process anywhere. And you’re always backed by the Diamond Certified Performance Guarantee. Here’s why the Diamond Certified ratings and certification process will help you find a top-rated insulation installer and is unparalleled in its accuracy, rigor and usefulness:

1) Accuracy: All research is performed by live telephone interviews that verify only real customers are surveyed, so you’ll never be fooled by fake reviews.

2) Statistical Reliability: A large random sample of past customers is surveyed on an ongoing basis so the research results you see truly reflect a Diamond Certified company’s top-rated status.

3) Full Disclosure: By clicking the name of a company above you’ll see the exact rating results in charts and read verbatim survey responses as well as researched articles on each qualified company.

4) Guaranteed: Your purchase is backed up with mediation and the Diamond Certified Performance Guarantee, so you can choose with confidence.

Click on the name of a Diamond Certified company above to read ratings results, researched articles and verbatim customer survey responses to help you make an informed decision.

More than 200,000 customers of local companies have been interviewed in live telephone calls, and only companies that score Highest in Quality in customer satisfaction–a 90+ on a 100 scale–as well as pass all of the credential-based ratings earn Diamond Certified. By requiring such a high score to qualify, the Diamond Certified program eliminates mediocre and poorly performing companies. Read detailed information about the ratings and certification process.

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SELECTED PHOTOS FROM THESE TOP RATED COMPANIES

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INDUSTRY INFORMATION AND RESEARCHED ARTICLES BY THE DIAMOND CERTIFIED RESOURCE

  • Owens Corning

  • Clopay

  • Pabco

  • Bonded Logic

  • Mountain Fiber

Foster Insulation
Childers Insulation
Unifrax Insulation
Industrial Insulation Group
Manson Fiberglass Insulation
Fibrex Mineral Wool Insulation
Johns Manville Insulation
Celotex Insulation
Thermax Insulation
Rockwool Insulation
Kingspan Insulation
Polyiso Insulation
Owens Corning Insulation
RPR Insulation
Roxul Insulation
Air Krete Insulation
Nansulate Insulation
Guardian Fiberglass Insulation
Armacell Foam Insulation
Knauf Insulation
Lewco Insulation
Thermafiber Insulation
Aerocell Rubber Insulation
Pabco Calcium Silicate Insulation
CertainTeed Fiberglass Insulation

wool insulation
exterior insulation
polystyrene insulation
reflective insulation
pipe insulation
wall insulation
blown insulation
industrial insulation
insulation installation
polyisocyanurate insulation
radiant barrier insulation
basement insulation
ceiling insulation
duct insulation
polyurethane insulation
insulation board
roof insulation
sound insulation
foil insulation
Styrofoam insulation
green insulation
foam insulation
spray insulation
attic insulation
spray foam insulation

Alamo
Antioch
Bay Point
Bethel Island
Blackhawk
Brentwood
Briones
Byron
Canyon
Clayton
Clyde
Concord
Cowell
Crockett
Danville
Diablo
Discovery Bay
El Cerrito
El Sobrante
Hercules
Hilltop Mall
Kensington
Knightsen
Lafayette
Los Medanos
Maltby
Martinez
Moraga
North Richmond
Oakley
Orinda
Pacheco
Pinole
Pittsburg
Pleasant Hill
Point Richmond
Port Chicago
Port Costa
Rheem Valley
Richmond
Rodeo
San Pablo
San Ramon
Tara Hills
Vine Hill
Walnut Creek
Walnut Heights
West Pittsburg

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The Association for Better Insulation (ABI) (www.betterinsulation.com)
Blow-in-Blanket Contractors Association (BIBCA) (www.bibca.org)
Cellulose Insulation Manufacturers Association (CIMA) (www.cellulose.org)Insulation Contractors Association of America (ICAA) (www.insulate.org)
National Insulation Association (NIA) (www.insulation.org)
North American Insulation Manufacturers Association (NAIMA)(www.naima.org)

Know What You Want
Determining What You Want from Contra Costa County Insulation Companies

Once you are ready to hire a Contra Costa County home insulation service, including those in the major cities of Concord, Richmond, Antioch, Walnut Creek and Pittsburg, it is important to know what you want. Unfortunately, many insulation contractors are less than professional and do not meet the standard of insulation installation required.

Use the following questions to help you determine what you want from your insulation contractor, and you are almost assured to find a reliable and trustworthy insulation company.

  • Do I want a Diamond Certified home insulation company that is rated best in quality and backed by the Diamond Certified Performance Guarantee?
  • What is my budget for new home insulation?
  • Are there any changes or repairs I’d like to have made before the insulation contractors start the job?
  • Is there a particular type of home insulation am I looking for (fiberglass, foam, cotton, cellulose, etc.)? 
  • Do I plan to live in this home long-term? Or is this a house I plan to sell or a rental property?
  • What personal and professional characteristics would I like my Contra Costa County insulation company to have?
  • Would I like a reputable insulation contractor that is fully insured and bonded?
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What To Ask In Person
Particular Questions to Ask in Person to Contra Costa County Insulation Installers

After questioning numerous Contra Costa County insulation contractors on the phone, you will want to cut down your list of prospects in Contra Costa County, including the smaller towns of Blackhawk, Briones, Diablo, Knightsen, Orinda, Pacheco, Pinole, Rodeo, and West Pittsburg. Visit those few remaining insulation companies in person.

Consider the following questions to help you obtain important information.

  • Will this insulation assist in keeping out allergens, dust and other pollutants? 
  • Can the insulation shift with my house when it settles? Will it keep  same R-value over time? (R-value will be sacrificed when there is a gap or a seam in the material). 
  • Can the insulation dry out well if there is a roof leak and it gets wet? Also would it maintain the insulating properties during the wet then  drying process?
  • Is the insulation a food source for mold? 
  • Will insulation help my home to be "greener"?
  • How long will it take the insulation to be installed?
  • What is the R-value of the insulation that you are installing?
  • What is the cost of insulation?
  • Will it reduce the need for finishing materials to lessen the environmental impact during construction? 
  • Will the insulation produce an air barrier without using added finishing materials (like tape and plastic wrap) and labor?  
  • How soon can the insulation pay for itself? Will the savings every month be more than the cost of financing? 
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  • What To Ask References
    Asking Questions to Insulation Contractors’ References in Contra Costa County

    It’s best to choose a Diamond Certified insulation company because all certified companies have passed an in-depth ratings process that most other companies can’t pass. If you want quality from an insulation contractor in Contra Costa County and the greater Bay Area, including those in the cities of San Ramon, Danville, Brentwood, Martinez and Pleasant Hill, you will have confidence choosing a Diamond Certified company.

    Diamond Certified reports are available online for all certified companies. And you’ll never be fooled by fake reviews. That’s because all research is performed in live telephone interviews of actual customers.
    If you can’t find a Diamond Certified insulation company within reach, you’ll have to do some research on your own. If you do, it’s wise to call some references provided by your insulation contractor. Keep in mind, though, that references provided to you by the insulation company are not equal in value to the large random sample of customers surveyed during the Diamond Certified ratings process. That’s because references given to customers from companies are cherry-picked instead of randomly selected from all their customers. So the contractors will likely give you a few customers to call that they know are satisfied.

    If you do call references on your own, specifically ask for a list of the company’s 10 most recent customers. This will help avoid them giving you the names of only customers they know were satisfied.

    Questions you may want to ask at this stage include:

    • Did the insulation crew keep a clean work environment? Did the workers clean up after the insulation was completed?
    • Did the insulation company offer a receipt for the installed insulation?
    • Were you satisfied with the services from _(insulation installing company name)_?
    • What type of insulation did the company install for you?
    • Did the installation contractor keep you up-to-date with the status of the project? Or did you have to call in order to get information?
    • If you live in smaller Contra Costa County towns such as Bay Point, Cowell, Crockett, Hercules, Hilltop, North Richmond, and Vine Hill, did they charge extra to travel to your home?
    • Did installation contractor clean up after completing the job?
    • When you need new insulation in the future, will you consider hiring this insulation contractor again?
    • Would you recommend this insulation professional to your friends and family?
    • Was the insulation company on time every work day?
    • Was the insulation installer on schedule?
    • Did the insulation company provide a written estimate of the expenses?
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  • Review Your Options
    Before Hiring a Good Contra Costa County Insulation Contractor

    The Diamond Certified symbol has been awarded to companies that scored Highest in Quality in an accurate ratings process.

    Before deciding on the best insulation contractor in Contra Costa County for you, it’s important to consider the following questions.

    • Are the insulation representatives knowledgeable about the brands and techniques they use?
    • Are the insulation professionals sensitive to your budget?
    • Can they offer various types of insulation and services to meet your resources?
    • Do the insulation companies offer written warranties that back up their work and their products?
    • What are the Contra Costa County insulation company’s billing practices?
    • Is the insulation contractor bonded and insured?
    • What can the insulation companies offer in Contra Costa County that meet your needs when it comes to types of insulation, scheduling, customer service and experience?
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  • How To Work With
    Before Hiring a Good Contra Costa County Insulation Contractor

    Before deciding on the best insulation contractor in Contra Costa County for you, it’s important to consider the following questions.

    Before deciding on the best insulation contractor in Contra Costa County for you, it’s important to consider the following questions.

    • Are the insulation representatives knowledgeable about the brands and techniques they use?
    • Are the insulation professionals sensitive to your budget?
    • Can they offer various types of insulation and services to meet your resources?
    • Do the insulation companies offer written warranties that back up their work and their products?
    • What are the Contra Costa County insulation company’s billing practices?
    • Is the insulation contractor bonded and insured?
    • What can the insulation companies offer in Contra Costa County that meet your needs when it comes to types of insulation, scheduling, customer service and experience?
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  • Be a Good Customer
    How You Can Be a Good Insulation Company Customer

    It's the insulation contractor’s responsibility put in quality insulation using the best possible installation techniques. But you play a big part in the success of your insulation, too. Here are a few simple steps you can take to be a good customer when hiring a Contra Costa County insulation company.

    • Remember, a friendly smile goes a long way in preventing and limiting conflict. Remain patient, rational and calm even when dealing with frustration or problems.
    • Before you hire an insulation company in Contra Costa County, restate your expectations and goals, and reiterate to the insulation representative your understanding of the agreement. Most problems with local insulation company occur because of a breakdown in communication. By being clear about your expectations and theirs, you can avoid most conflicts.
    • Ask your insulation company if you should call to check on the progress or if he will call you with updates.
    • Be sure your service representative has a phone number where they can reach you at all times while they’re installing insulation. The work will move along more smoothly if your insulation contractor can reach you for any necessary updates, questions or work authorizations.
    • When your contractor contacts you, return calls promptly to keep the insulation company on schedule.
    • Pay for the insulation work promptly.
    • Be clear and upfront with the insulation company. Let them know what you want from your insulation, the long-term outcome you’re expecting and specific ways they can satisfy your expectations.

    Why make the effort to be a good customer? Insulation contractors in Contra Costa County appreciate customers who are straightforward, honest and easy to work with. Your good customer behavior sets the tone from your end and creates an environment conducive to a good relationship. Things may very well go smoother and any problems may be more easily resolved.

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Check The Work
Double Check the Insulation Company’s Work

When the insulation work is completed, most good Contra Costa County insulation companies will give you a written invoice that details the completed work.

This invoice usually includes:

  • A list of all home insulating services performed.
  • An itemized list of the gutter protection system and the gutter guard supplies purchased.
  • The total cost for insulation services, including the amount due for labor.
  • Any applicable warrantees or guarantees provided by the insulation system manufacturers and the company.
  • The name, physical address and license number of the contractor

It’s a good idea to compare the completed work to what was promised on the written invoice. Ask your company representative to walk through the job site with you and show you the completed work. Check what was done against the invoice. During the walk-through, ask if there are any special instructions for maintaining your new gutter protection system.

If you have questions about the work that was done or the materials used, this is the time to ask. You should also ask about any specific instructions for maintaining your insulation or what to do if you ever suspect a problem with your new home insulation.

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Written Warranties
Make Sure to Get a Written Warranty from Contra Costa County Insulation Companies

The majority of good insulation contractors offer some type of warranty on their work or on the materials they’ve used. All warranty details should be provided to you in writing during the contract phase or at the completion of the job. This written warranty information should include the following:

  • What insulation products and services are covered.
  • Your responsibility in the case of product failure, including actions you must take in order to redeem the warranty. (i.e., if you have to pay for labor or materials, or if you are required to pay a prorated amount).
  • Terms, limitations and exclusions on the insulation, materials and workmanship.
  • If the warranties are transferable to the new owner if you sell your home. 
  • The home insulation services’ business name and physical address.
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Top 10 Requests
Most Popular Requests for Insulation Services

The most common requests for residential and commercial insulation services in Contra Costa County are listed below.

Installing Insulation
Adding insulation to a commercial building or a residential home in the walls, ceiling, or floors.

Basement Insulation
Applying insulation to  the basement of a home or business for thermal, acoustic, or fire insulation.

Spray Insulation
Applying insulation that is forced out of a can or other container onto the walls, ceiling, or floors of a business or home for thermal, acoustic, or fire insulation.

Blown Insulation
A method of applying insulation by mechanically blowing it into the walls, ceiling, or floors of a business, or home for thermal, acoustic, or fire insulation.

Crawl Space Insulation
Insulating the area of limited height which is under a floor or a roof, which is usually where the wiring and plumbing access is.

House Insulation
Applying insulation to a building that lived in by a household or family for the purpose of in thermal, acoustic, or fire insulation.

Spray Foam Insulation
A very specialized two component mixed which comes together at the top of a gun to form an expanding foam which can be sprayed into wall cavities, concrete slabs, and other places insulation is needed.

Insulation Foam
An expanding foam mixture made up of isocyanate and resin which can be sprayed onto roof tiles or wall cavities, among other places.

Basement Wall Insulation
Applying insulation to the walls of the room that is either completely or partially below a ground floor.

Attic Insulation
Installing  approved insulation products, such as rock, wool, fiberglass, and cellulose, evenly across the unconditioned attic area to attain the preferred levels of thermal resistance.

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Glossary Of Terms
Glossary of Terms for Local Insulation Services

Below are key insulation company terms and descriptions that will help you research, hire and deal with new installation services from start to finish.

Always be sure you understand the terms, products, materials and installation techniques your insulation installer is using. If you don't understand, ask for clarification until you do.

adhesive
A substance that is used to bond insulation materials by exterior attachment.

attic insulation
The installation of approved insulation products (rockwool, fiberglass, and cellulose) evenly across the unconditioned attic area to achieve desired levels of thermal resistance.

Also known as: attic insulation installation, attic door insulation, blown attic insulation, attic stair insulation, cellulose attic insulation, attic stairs insulation, foam attic insulation, reflective attic insulation, attic insulation types

attic insulation removal
Removing visible soot and char from the surface of insulating materials sufficient enough to attain an acceptable appearance. Working in attics and endeavoring to eliminate loose soot and char particles off of the  insulation is one of the most difficult jobs.

Also known as: removing attic insulation, remove attic insulation, attic insulation, fiberglass insulation removal, insulation removal, attic insulation types, attic insulation installation, blown attic insulation, types of attic insulation, attic insulation r value, removing blown in insulation, installing attic insulation

basement insulation
Applying insulation to the basement of a home or business for thermal, acoustic, or fire insulation.

Also known as: basement wall insulation, attic insulation, how to insulate a basement, basement foam insulation, insulating basement, basement ceiling insulation, home insulation, basement insulation tips, insulation types, insulate basement walls, basement floor insulation, house insulation

basement wall insulation
Applying insulation to the walls of the room that is either completely or partially below a ground floor.

Also known as: basement wall panels, basement insulation, insulate basement walls, insulation for basement walls, basement floor insulation, insulation basement walls, insulating basement walls, basement wall construction

batt
A piece of stretchy to semi-rigid type insulation with a specific width and length. It may or may not have vapor retarder facing.

Also known as: batt insulation, batting

blanket insulation
A nearly flat and stretchy insulation in sheet form furnished in units of considerable area.

Also known as: fiberglass blanket insulation, space blanket insulation, basement blanket insulation, fiberglass insulation, fire blanket insulation, insulated blankets, weather blanket insulation, thermal blanket insulation, insulating blankets, ceramic blanket insulation

block insulation
Rigid insulation that is formed into rectangular units.

Also known as: concrete block insulation, block wall insulation, cinder block insulation, foam block insulation, insulated concrete block, exterior insulation, insulated concrete blocks, thermal block insulation, under slab insulation

blown insulation
A method of applying insulation by mechanically blowing it into the walls, ceiling, or floors of a business, or home for themal, acoustic, or fire insulation.

Also known as: blown foam insulation, blown in insulation, blown cellulose insulation, green fiber blown insulation, blown in insulation attic, insulation r value, home insulation, insulation types, cellulose insulation, blown fiberglass insulation, blown in insulation types

caulk
The process of sealing and making a space watertight or airtight. Caulking is an important part of residential insulation services.

crawl space insulation
Insulating the area of limited height which is under a floor or a roof, which is usually where the wiring and plumbing access is.

Also known as: crawl space insulation installation, insulation crawl space, crawl space moisture, insulation for crawl space

energy code
Requirement in a particular area that will outline the minimum level of insulation and/or other energy-efficiency methods  for construction. These codes will be updated on an ongoing basis. Minimum levels of insulation are set by allowing for the cost of energy and the level that provides a reasonable payback.

fiberglass insulation
Fiberglass is a fibrous material made by spinning molten glass. It is used as an insulator and retardant of heat loss. Fiberglass insulation is a popular choice for homes and businesses.

high-performance insulation
Insulation that is made of fiber glass with densely packed fibers. It results in higher R-values for a specified thickness. This is mainly used in confined spaces like walls or cathedral ceilings.

Also known as: high performance insulation, attic insulation, home insulation, spray insulation, high temperature insulation, insulation contractors, fiberglass insulation, insulation types, cellulose insulation, garage door insulation

house insulation
Applying insulation to a building that lived in by a household or family for the purpose of in thermal, acoustic, or fire insulation.

Also known as: house insulation types, house insulation materials, old house insulation, house wrap insulation, house wrap insulation, types of house insulation, home insulation, insulation r value, basement insulation, insulation, spray foam house insulation, wall insulation

installing insulation
Adding insulation to a commercial building or a residential home in the walls, ceiling, or floors.

Also known as: installing attic insulation, installing insulation in attic, installing fiberglass insulation, installing insulation batts, installing home insulation

insulating cement
A mixture of several insulating fibers along with binders and water to form a moldable paste insulation which can be applied to fittings or irregular surfaces.

Also known as: cement insulation, insulation cement, aerogel insulation, fireproof insulation, vermiculite insulation, high temperature insulation, insulation materials, duct insulation, sound proof insulation, ceramic insulation

insulation
The act of being insulated or the state of being insulated. Insulation also refers to the material used in insulating services.

Also known as: attic insulation, installing insulation, basement insulation spray insulation, blown insulation, blow in insulation, crawl space insulation, house insulation, insulate, insulation r values, spray foam insulation, cellulose insulation, fiberglass insulation, insulation foam, spray in insulation, basement wall insulation, home insulation, attic insulation types, garage door insulation, thermal insulation, insulation types, insulation r value

insulation foam
An expanding foam mixture made up of isocyanate and resin which can be sprayed onto roof tiles or wall cavities, among other places.

Also known as: insulating foam, spray insulation foam, insulation foam spray, wall insulation foam, attic insulation foam, insulating spray foam, sound insulation foam, rigid foam insulation, insulation foam board, foam insulation, pipe insulation foam, spray foam insulation r value, spray foam

insulation removal
Process of removing insulation because of mildew and mold.

Also known as: attic insulation removal, insulation removal equipment, asbestos insulation removal, blown insulation removal vacuum, loose fill insulation, removing attic insulation, insulation removal machine, insulation removal bags

pipe insulation
Form of insulation that is appropriate to apply to cylinder surfaces.

Also known as: pipe insulation wrap, hot water pipe insulation, foam pipe insulation, heating pipe insulation, pipe wrap insulation, pipe insulation material, fiberglass pipe insulation, piping insulation, water pipe insulation

polyethylene
Material for insulation that is closed-cell and thermoplastic.

radiant barrier foil
A thin aluminum film which works to reflect the  heat gain. Typically it will be fastened to the underside of a roof or in an attic space. It prevents the heat that is absorbed by hot roofs from transferring to the inside of the home.

Also known as: radiant barriers, radiant barrier, radiant heat barrier, radiant barrier foil insulation, attic radiant barrier, radiant barrier spray, radiant barrier attic foil, efficient attic systems, efficient attic systems, reflective radiant barrier

radiant barrier spray
This spray is a coating which is applied to structures for insulation and other purposes. Spray polyurethane foam (SPF) is the most popular barrier spray. It provides a sealed thermal barrier for residential and business applications. These products are engineered for a diversity of uses which include roofing and fire control. This product is also used to block radiant heat from the sun.

Also known as: radiant barrier paint, radiant barrier foil, radiant barrier, spray on radiant barrier, radiant barriers, attic radiant barrier

R-value
This is the measure of resistance to heat flow. Insulation materials will have very small pockets of trapped air, and these pockets will resist the transfer of heat through material. The capacity of insulation to slow down the transfer of heat is measured in R-values. The better the insulation material's ability to resist the flow of heat through it, the higher the R-value.

Also known as: r value, insulation r value, r value insulation, fiberglass r value, r value glass

spray foam insulation
A very specialized two component mixed which comes together at the top of a gun to form an expanding foam which can be sprayed into wall cavities, concrete slabs, and other places insulation is needed.

Also known as: spray in foam insulation, spray in foam insulation kits, spray on foam insulation, spray foam insulation equipment, foam insulation, spray foam insulation r value

spray insulation
Applying insulation that is forced out of a can or other container onto the walls, ceiling, or floors of a business or home for thermal, acoustic, or fire insulation.

Also known as: spray insulation, spray in insulation, diy spray insulation, spray foam insulation kits, spray foam insulation equipment, spray foam insulation r value, spray insulation types, spray home insulation, spray foam insulation

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Frequently Asked Questions
FAQ for Local Home Insulation Companies

Q: Why choose a Diamond Certified home insulation company?
A: Diamond Certified helps you choose a home insulation contractor with confidence by offering a list of top-rated local companies who have passed the country’s most in-depth rating process. Only insulation companies rated Highest in Quality earn the prestigious Diamond Certified award. Most companies can’t pass the ratings. American Ratings Corporation also monitors every Diamond Certified company with ongoing research and ratings. And your new insulation purchase is backed by the Diamond Certified Performance Guarantee.

Q: What’s the purpose of insulating my home?
A: Insulation will keep the house cooler in the summer and warmer in the winter since insulation will resist the flow of heat. Heat, a form of energy, will always look for a cooler area. This means it will flow out of the house in the winter and into the house in the warmer months. If you can reduce the  heat flow, a well-insulated house uses less energy to heat and cool. Insulation will also acts like a sound absorber With so much noise in our environment today, more are soundproofing their houses.

Q: What parts of a house should be insulated?
A: Attics and external walls are not the only places for insulation. Insulation should be put in  other areas of a house, like attics, basement walls, ceilings that are vaulted, floors over unheated garages or porches, and in between internal walls, particularly the bathroom, lofts or floors.

Q: What does u-value mean?
A: U-Value means the amount of the rate of heat loss. The greater the insulating power, the lower the u-value will be. U-value is how insulation is identified and labeled

Q: Where can I find u-value information when I am buying insulation?
A: Insulation manufacturers always print the u-values of their products on labels or bags of the product.  Most of the time, u-values will be printed on the facings of fiber glass batts and rolls.

Q: How can I get the best performance from my new home insulation?
A: The installation of the insulation is the most important ingredient for performance. Regardless of the insulation type, the full u-value can only be achieved with proper installation. Make sure to choose a certified home insulation contractor.

Q: When adding insulation to your home, do you need to remove the old insulation?
A: Since u-values are cumulative, There is no need to remove any current insulation because u-values are cumulative.

Q: Why and how can sound be controlled with the installation of new insulation?
A: The limiting of sound from one area of the house to another requires the application of special insulation plus standard insulation to enclose the noise generating source. Then it forms a sound barrier between the source and the surrounding area. The purposes of controlling sound is to reduce obnoxious noise (like machines), to reduce the noise level, and to provide for good working conditions.

Q: What options do I have when choosing insulation?
A: You can choose from many types of insulations, such as: cellulose, foam, cotton, and fiber glass. For residential homes, the most common types are fiber glass and cellulose.

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