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Cement asbestos roof shingles (C) Daniel Friedman Master Photo Guide to Asbestos-containing Products & Materials

Asbestos product photo guide:

This article provides a photo guide to and list of asbestos-containing products & materials, and links to detailed articles about individual asbestos-containing products & materials found in buildings and in a wide range of products used in both home and industry.

We include photographs of a very wide range of examples of asbestos-containing products & materials found on or in or around buildings as well as other ACM products.

InspectAPedia tolerates no conflicts of interest. We have no relationship with advertisers, products, or services discussed at this website.

List & Photographs of Asbestos-containing Materials used in buildings, Homes, Appliances, Products, and industry

Vermiculite insulation in this attic ceiling may contain asbestos fibers.Here is our extensive photo guide to examples of the many forms in which asbestos was used.

This list includes photographs of asbestos-containing materials and our links to more detailed articles about individual asbestos-containing products where you will find more photographs or descriptions of these materials.

These asbestos and asbestos-containing product photographs can assist in recognizing possible asbestos-containing materials, especially in old buildings, mechanical systems, or in old equipment. We include links to detailed articles about these individual asbestos-containing products.

Asbestos was banned in all home construction uses beginning in 1990, but beware: pre-1990 products might have been used in some homes built shortly afterwards.

Low asbestos risk in some materials: One should note that some of these products contain such small amounts of asbestos, or asbestos in forms not easily converted to airborne fibers (non-friable), that the risk from the product is likely to be very small.

One might elect to dispose of an old asbestos-containing toaster, but not to hire an environmental test firm or asbestos abatement company for that procedure.

Many other asbestos-containing products, both historic and among some current products, encapsulate the asbestos fibers in cementious or resinous materials which minimize the possible release of asbestos fibers into the air.

Note: most of the uses of asbestos listed here are obsolete

 and the products mentioned have not been manufactured for quite some time. However these products may still be encountered, particularly in older buildings and among old consumer products.

However some current materials may contain and are permitted to contain asbestos.

 In May 1999 Asbestos Materials Bans Clarification was issued by the U.S. EPA clarified that there are some categories of asbestos-containing products that are NOT subject to a ban.

For example, the Asbestos National Emission Standards for Hazardous Air Pollutants, or NESHAP) rules issued in November, 1990 prohibits spray-on application of materials containing more than 1% asbestos to buildings, structures, pipes, and conduits unless the material is encapsulated with a bituminous or resinous binder during spraying and the materials are not friable after drying. [Italics inserted by -DF]. Thanks to Susan Kimball, Argus Pacific, for this clarification.

While an expert lab test using polarized light microscopy may be needed to identify the specific type of asbestos fiber, or to identify the presence of asbestos in air or dust samples, many asbestos-containing building products not only are obvious and easy to recognize, but since there were not other look-alike products that were not asbestos, a visual identification of this material can be virtually a certainty in many cases.

This document and other asbestos identification articles given here aid building buyers, owners or inspectors who need to identify asbestos materials (or probable-asbestos) in buildings by simple visual inspection.

We provide photographs of asbestos containing materials and descriptive text of asbestos insulation and other asbestos-containing products to permit identification of definite, probable, or possible asbestos materials in buildings.

Contact Us to add items and photographs to this list of asbestos containing materials.

Asbestos Hazard Basics

See ASBESTOS REGULATION Update for details

and then see EPA ASBESTOS MATERIALS BAN: CLARIFICATION 1999 - 2003 clarification for a description of what asbestos-containing materials are currently banned or not banned in the U.S.

Asbestos Product Pictures - Alphabetic List of Uses of Asbestos

Asbestos mural base at Grand Central Terminal in New York City (C) D Friedman (Rosato)

Rosato's photo shows asbestos cement sheets that were used to line the arched ceiling in Grand Central Terminal in New York City. The asbestos sheets served as a base for painting a mural of the heavens.



Asbestos automobile part (C) Daniel Friedman, Rosato, Houston

Vermiculite insulation in this attic ceiling may contain asbestos fibers.

A client brought in some shaft bearings from a 78” butterfly valve installed in [a commercial facility] in Australia.

They were full of chrysotile asbestos. I had previously never heard of asbestos being used in this way and couldn’t see any reference to it on your site so I thought I would drop a line with a photo. These bearings are approximately 21cm diameter and 13cm wide.

(The second picture (below) of the valve at above-right is just a generic butterfly valve to indicate where the bearings were located in the valve.) - D.M. 3/12/2013

Vermiculite insulation in this attic ceiling may contain asbestos fibers.

Also see ASBESTOS PRODUCTS in AUSTRALIA

Vermiculite insulation in this attic ceiling may contain asbestos fibers.

Asbestos containing acoustic ceiling tiles

Tremolite asbestos on a ceiling

Textured popcorn ceiling paint (C) Daniel Friedman

Cement asbestos roof shingles (C) Daniel Friedman

Asbestos millboard (C) Daniel Friedman

Asbestos millboard (photo above) used for stoves and heaters, in garages, as fireproof wallboard, as gaskets, as washers in electrical applications, stove mats, safes, motion picture booths, automobile hoods. Asbestos millboard is a cementious product that was produced in sheets and used for fire barriers and in other applications.

The material is quite similar to cement asbestos roof shingles and siding, and was produced in sheets of varying thickness (typically 1/8"- 1/4") and dimension depending on its intended use.

Asbestos millboard was used as a fire barrier behind and over and around wood stoves, coal stoves, & heating appliances in buildings up to 1978. It was also used in some locations where a moisture-resistant building material was desired.

Also see ASBESTOS CEMENT FLAT SHEETS.

Asbestos millboard fragment (C) Daniel Friedman Drywall layers (C) Daniel Friedman

Comparing drywall, plasterboard, and cement asbestos millboard

Above we illustrate a fragment of cement asbestos millboard that is about 1/8" thick and his hard - cementious, and at above right we take a look at the edges of two layers of drywall or plasterboard in an older home - showing that that material, principally made of gypsum, is comparatively soft, paper-faced, and easily cut with a knife.

Asbestos clutch and brake parts (C) Daniel Friedman - Rosato

Note that older drywall products and drywall joint compound often also contained asbestos.

Also see DRYWALL, FIBERBOARD, PLASTER INTERIORS

Aristocrat-saucepan-bakelite-handle (C) InspectApedia.com Tiiu

Above: an asbestos-containing Aristocrat brand saucepan manufactured by West Bend using Bakelite, an asbestos-containing thermoplastic. Photo courtesy of an InspectApedia.com reader.

Philips cooling towers using asbestos components  - at InspectApdedia.com

Drywall layers (C) Daniel Friedman


Asbestos duct vibratin damper (C) Daniel Friedman

Photograph of  asbestos paper wrap on heating/cooling duct exterior

Theater wiring possibly containing asbestos Asbestos filter (C) Daniel Friedman - Rosato

Details are at ASBESTOS FILTERS.

Asbestos fire log (C) Daniel Friedman

Photograph of  asbestos slab ceiling insulation, tremolite asbestos


Asbestos fire suit (C) Daniel Friedman Mine Safety Appliances Rosato

Asbestos floor tiles (C) Daniel Friedman

Asbestos braided rope and packing (C) D Friedman (Rosato)

Asbestos on heating boiler (C) Daniel Friedman

Asbestos appliance handle (C) Daniel Friedman - Rosato - Dominion

Asbestos fire hose or flue hose (C) Daniel Friedman, Rosato, Gates


Spray on fireproofing on steel construction DF 2008

Asbestos-containing ornaments - Glaser's patent (C) InspectApedia.com

Photograph of  asbestos paper wrap on heating/cooling duct exterior


Asbestos paper used for a wide range of applications including in roofing products, filing cabinet liners, soldiers helmets, armored car roofs, welding applications, boiler jackets, gaskets, motor parts.

Asbestos pipe insulation in bad shape (C) Daniel Friedman

Below: fragments of white cloth/paper tape and white sealant cement closed the connection of this rusted flue vent connector ("stack pipe") into the base of a stone chimney in a New York home that was built in 1870.

Chrysotile asbestos in cement used to seal flue to chimney (C) InspectAPedia PH

The homeowner had a sample of the sealant at this metal flue-to-chimney tested the white sealant cement for asbestos and reported:

Just to update you ... The insulation around the pipe [referring to a white sealant paste around the connection of a flue vent connector to a masonry chimney] was 40% Chrysotile. - Anon [by private email] 2015/12/22


Transite plumbing vent (C) Daniel Friedman

Photo of tranite cement-asbestos material used for air ducts and for heating vents (C) Daniel Friedman

Vanguard rocket photo with asbestos (C) Daniel Friedman - Rosato


Asbestos Used In Pianos

Starr piano keyboard © D Friedman at InspectApedia.com

Reader Question: Did the Starr Piano company use any asbestos in any part / parts in there Star Remington Model?

Reply:

Certainly where asbestos is a general concern, an inspection onsite by an expert will provide far more assurance about asbestos risks than we can provide by web discussion. That said:

Asbestos was used in some piano padding. I have not found a referral to asbestos specifically used within pianos themselves. However it wouldn't surprise me if pianos made for humid climates didn't use ASBESTOS MILLBOARD for some component parts.

Details about the use of asbestos in pianos are found at

see ASBESTOS in PIANOS

Asbestos window putty (C) Daniel Friedman

Photo of cement asbestos roof shingles (C) Daniel Friedman ... Photo of cement asbestos roof shingles (C) Daniel Friedman

Asbestos Sheet Packing (C) Daniel Friedman - Rosato

Asbestos wall siding (C) Daniel Friedman

Old fiberglass silo in Queensland, Australia, could have been coated with an asbestos-containing paint (C) InspectApedia.com  Miles ... Old fiberglass silo in Queensland, Australia, could have been coated with an asbestos-containing paint (C) InspectApedia.com  Miles

Transite pipe being made (C) D Friedman (Rosato)

Asbestos wallboard in a theater (C) D Friedman (Rosato)

Steel casement windows with asbetsos window putty (C) Daniel Friedman

Here is a closeup photo of asbestos-containing window putty from the 1950's vintage steel casement windows shown at left. This putty was tested and confirmed to contain asbestos fibers and filler.

If the window putty is cracked, drilled, sanded, or otherwise disturbed, it could result in the release of asbestos fibers into the air that could present a health risk.

OSHA has cited contractors for exposing workers to asbestos during window renovations (June 1997) Window putty is normally on the exterior of windows: it is unlikely that it will release measurable levels of asbestos fibers indoors except during remodeling or demolition.

Based on their age, we would have guessed that the steel casement windows shown in our photo (above left) included both lead paint and asbestos-containing window putty. Lab tests confirmed that the window putty contained asbestos.

The building owner was able to significantly reduce the cost of removing this asbestos material by having the contractor remove the entire windows intact rather than attempting to remove every inch of putty from the frames.

The windows were replaced with newer more energy-efficient units.

 




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Reader Comments, Questions & Answers About The Article Above

Below you will find questions and answers previously posted on this page at its page bottom reader comment box.

Reader Q&A - also see RECOMMENDED ARTICLES & FAQs

On 2022-08-08 by InspectApedia-911 (mod) - does 1960s residential-use wire insulation use asbestos

@Anonymous,

It'd be unlikely but not impossible for 1960s residential-use wire insulation to use asbestos. Asbestos was used in some electrical wire insulation however.

Take a look at

DOES THIS MATERIAL CONTAIN ASBESTOS? - 5 easy questions to tell if a BUILDING MATERIAL probably contains asbestos

and also

ASBESTOS ELECTRICAL WIRE INSULATION

Thank you for offering to donate to InspectApedia. But please don't send us money. InspectApedia is supported by a small advertising income from Google Ads - annoying to some but permitting us to maintain the website.

Your most- helpful contribution is in the form of questions, content suggestions, photos, criticism. Working together makes us smarter.

Thanks.

On 2022-08-08 by Anonymous

@InspectApedia-911, thanks for the quick response! Would this contain asbestos? Also thanks so much for your help! Is there a way to donate to your site?

On 2022-08-08 by InspectApedia-911 (mod)

@Jake C,

Looks like frayed electrical cable that needs replacement.

On 2022-08-08 by Jake C

Hi, this is behind the dryer and hooks to some sort of box which then connects to the dryer. I’m concerned what the contents might be? House is built in 1963

Frayed electrical cable (C) InspectApedia.com Jake

On 2022-08-06 by InspectApedia-911 (mod) - was it common to use asbestos in firebricks in the 1940's?

@robby b,

Fire-brick, by which I think you mean the bricks used to form the actual fire chamber in a fireplace, was hard-fired clay intended to withstand high temperature. Some of those might contain asbestos but in my opinion that wasn't common.

More clearly: asbestos was not regularly used in refractory fire-brick.

For example discussion of this question, see

Paglietti, Federica, Sergio Malinconico, Beatrice Conestabile della Staffa, Sergio Bellagamba, and Paolo De Simone. "Classification and management of asbestos-containing waste: European legislation and the Italian experience." [PDF] Waste management 50 (2016): 130-150.

copy at https://inspectapedia.com/hazmat/Asbestos-Containing-Waste-Paglietti.pdf

Asbestos was more likely in fake logs in gas fireplaces and in fire-backs used in other gas heating equipment including fireplace inserts.

On 2022-08-06 by robby b

Wondering how common it was to use asbestos in firebricks in the 1940's? We are renovationg a 1940's house that had tile all over the fireplace. We broke off the tile off recently. I had tested the mortar and brick on the outer portion, (hearth/mantle) of the fireplace that was negative, but never thought about the inside having different brick.

I have seen so many mixed opinions on this so wanted to check on here. I know it has been found in firebricks but didn't know how common it was in the 40's.

On 2022-05-30 by InspectApedia-911 (mod) - would fake brick wall be likely to have asbestos sheeting behind it?

@Susan Stewart,

Normal residential wall construction uses drywall and joint compound on wood or metal studs, over which someone might have built a brick veneer. (That's what I'm guessing you mean by "fake brick wall".)

Older drywall (you don't give location nor building age) may contain asbestos and certainly joint compound did.

A fire-resistant wall would have been of different construction and might have used asbestos such as cement ASBESTOS MILLBOARD

But my goodness: behind a brick veneer wall? Asbestos isn't radioactive. It won't creep through a brick wall; as long as you're not demolishing or hacking into the wall there's no detectable possible asbestos effect from what's behind it.

On 2022-05-30 by Susan Stewart

Would an internal fake brick wall in an old hall be likely to have asbestos sheeting behind it?

On 2022-03-09 by Inspectapedia Com Moderator - does fiberglass grain silo have asbestos?

@claire,

Thank you for the photos and interesting question about the use of asbestos in agricultural silos and, as perhaps in your photo, smaller storage tanks.

It's a fair question to ask, since fire hazards have always been a significant worry at silos, barns, and other agricultural buildings.

And indeed some research has reported the use of asbestos in silos, as I'll cite below. The most common use of asbestos in those environments was in cement-asbestos sheets and in some cement-asbestos or asphalt-asbestos roofing products.

While a photo examination is by no means an exhaustive lab test, the material in your photos looks to me like heavy fiberglass.

I can't say what might have been used to coat or paint it, however. Asbestos was used in silo roof or wall coatings.

If you avoid grinding sawing or otherwise making a dusty mess, it's not likely that this silo would present a measurable airborne particle (or asbestos) hazard.

Please find your question and photos and our more detailed reply now online at

ASBESTOS in SILOS

On 2022-03-09 by claire

Hi there. We have an old grain silo on our recently purchased farm that we would like to dispose of but are concerned it could be asbestos? It looks like fibreglass. Advice welcomed

Toppled fiberglass grain silo (C) InspectApedia.com Claire ... Toppled fiberglass grain silo (C) InspectApedia.com Claire ... Toppled fiberglass grain silo (C) InspectApedia.com Claire

 

On 2021-12-30 by Inspectapedia Com Moderator - UFFI insulation looks like foam and turned to powder if touched

@Martha Herr,

That may be a spray foam insulation product. UFFI was popular in the 1970s and you can read about it by searching this website for

UFFI Insulation

On 2021-12-29 by Martha Herr

We are taking walls out of our 1972 home that has 3% asbestos in the drywall.

After removing the drywall we found this white substance behind our owens corning insulation. It looks like foam and turns to powder if touched. Does this look like asbestos to you?

UFFI insulation (C) InspectApedia.com Martha ... UFFI insulation (C) InspectApedia.com Martha

On 2021-09-27 by Anonymous

@inspectapedia.com.moderator, Thank you very much for explanation! Love your page and that you are helping people! You helped me a lot thank you so so much!

On 2021-09-27 by inspectapedia.com.moderator (mod) - install cover at plumbing drain access and watch for EnviroScare

Fiberglass and other materials at a bathroom plumbing drain access (C) InspectApedia.com BPA@Bathroom pipes asbestos,

I have to ask you to forgive us as while we write and manage this website out of a desire to be helpful, we are limited in how much we can help you when we can't identify something in a photo.

Earlier you'll remember that I said
... I can't make out anything else in your photo.

We haven't seen something in your photo that we could identify as Asbestos, and we have seen some things that we couldn't identify at all.

So no one can say from a single photograph, one which is but partly clear, whether or not your building contains asbestos.

Asbestos is safe and legal and can be left in place in buildings as long as it is not being disturbed or made Airborne or otherwise being spread about.

I must caution you that if you speak to most environmental Professionals in the way that this conversation has progressed it could be very expensive for you.

If you try to insist that people guarantee that you are safe from an environmental hazard when they really don't have a can't have complete information to do so, they're going to be forced to spend a lot of your money to reduce their risk by telling you to have every possible test that you could conducted or to hire a hazardous material remediation company.

All of that with no basis in any fact other than your worry.

You also want to be careful that your anxiety itself doesn't become a greater health hazard than your building.

What I can see in your photo is a small access panel to a plumbing drain clean-out. Some fiberglass or rock-wool is showing; Put a removable cover on the opening.

Also see

ENVIRO-SCARE - PUBLIC FEAR CYCLES

On 2021-09-26 by bathroom pipes asbestos

@inspectapedia.com.moderator, sorry to bother so would you say I am safe, just to close it, tape it? No need to test for asbestos? If I had laundry for year next to it, and stored rolled rug there, which went into that hole and touched it, do you think they are safe to wear and use?

So as u said there should be fiberglass on right, the pipe in middle, any idea what is on left and if that need to be tested?

And would the possible asbestos in wall/joints from that cutted opening go into air and clothes? And any idea if asbestos from renovation from other condos bathroom could come through that hole inside?

Do i need to do air test or dust test? Thanks a lot for your help! (please feel free to delete all the other photos and posts, bc I guess i wrote it confusing)

On 2021-09-24 by inspectapedia.com.moderator (mod)

@Anonymous,

Sorry, I'd like to be helpful , but I can't make out anything else in your photo.

On 2021-09-23 by Asbestos in vents?

@inspectapedia.com.moderator,Also would like to ask, can there be asbestos in kitchen and bathroom vents/vent pipes? Either as some tape or what could get and stay there after renovations?

We have sometimes strong wind and I can feel the air is coming through the went/pipe inside and worried some bad dust coming in.Thank you!!

@inspectapedia.com.moderator, the thing on the left [Photo above]

On 2021-09-23 by Anonymous

@inspectapedia.com.moderator,

Fiberglass and other materials at a bathroom plumbing drain access (C) InspectApedia.com BPA

On 2021-09-23 by Anonymous

@inspectapedia.com.moderator, Can I pls ask the weird thing on the left is also not asbestos? Do I have to worry there is fiberglass or possible asbestos releasing from the cuted wall on the laundry i have next to it and now its in my all clothes and in air in the bathroom? I stored rug there and it even touched it, can i use it?

Can I maybe just duck tape it? There is also some other hole higher and it looks like the wall is not painted there, do i need to pain it or also somehow cover it? Thank you very much for all your help! This site is the best!

Fiberglass and other materials at a bathroom plumbing drain access (C) InspectApedia.com BPA

On 2021-09-23 by inspectapedia.com.moderator (mod)

@Bathtoom pipes asbestos,

That looks like mineral wool or fiberglass insulation around some Plumbing piping. The access opening was made to get to the clean out in the drain line. It would be appropriate to have a removable cover over that opening.

On 2021-09-23 by Bathtoom pipes asbestos

Found this in a bathroom condo from 1970 under sink cabinet totally open. On right its something fluffy, in middle some pipe and left somehing weird. I have laundry next to it for a year also rug right there.

If its asbestos is it in all my clothes now and rug? Also the wall is cuted there is that safe?What to do please? Thank you very much!
Fiberglass and other materials at a bathroom plumbing drain access (C) InspectApedia.com BPA

On 2021-09-23 by Bathroom pipes asbestos

I found this in condo 1970 bathroom right under sink. Should i be concerned? Can that be asbestos?

I have laundry there right next to it for months under sink in open basket and bathroom rug too. If its asbestos is it in my clothes and rug? Thanks so much!
Fiberglass and other materials at a bathroom plumbing drain access (C) InspectApedia.com BPA

On 2021-09-16 by inspectapedia.com.moderator (mod)

@Clueless,

It seems unlikely that asbestos fabric would have been used in the bituminous facing on fiberglass batts. However seeing what contextual information you can add, as asked at

DOES THIS MATERIAL CONTAIN ASBESTOS? - 5 easy questions to tell if a BUILDING MATERIAL probably contains asbestos -

https://inspectapedia.com/hazmat/DIY-Asbestos-Material-Test.php

might be helpful

On 2021-09-15 by Clueless

Hi,

In a house built in the early 50's, I'm discovering fiberglass insulation (Which looks like it either came off a roll, or was installed as bats) inside of interior walls.

Ignoring that puzzling design choice, the backing on the fiberglass looks like a black fabric or canvas material. What is the likelihood that there is asbestos in that fabric?

There seems to be asbestos in a couple other places, so I wouldn't be entirely surprised.

Thank you!

On 2021-09-01 by inspectapedia.com.moderator (mod)

@rose williams,

You posted and we replied to this previously at

https://inspectapedia.com/hazmat/Asbestos_Ceiling_Paint.php

On 2021-09-01 by rose williams

what type of ceiling material was popcorn texture applied to, could it be applied to a fiberboard,plywood or other type of ceiling material?


On 2021-08-18 by inspectapedia.com.moderator (mod)

@David,

Thank you for the generous words. We've been working hard on this material for a long time so we are especially grateful when readers find it trusted and useful.

Your comments and questions are always helpful.

On 2021-08-18 by David

@inspectapedia.com.moderator,

Thanks very much for your help! I really appreciate your website, I've been referring to it for years and it's been really helpful!!!

On 2021-08-18 by inspectapedia.com.moderator (mod) - particleboard is a wood product, not asbestos

@David,

"Particleboard" is a reconstituted wood product: made of wood or cellulose chips, sawdust, planer shavings, compressed and combined with a binder adhesive. It's not an asbestos product.

See details at

PARTICLEBOARD PROPERTIES & MANUFACTURE
[PDF] U.S. EPA, Environmental Protection Agency, retrieved 2021/08/17 original source: https://www3.epa.gov/ttnchie1/ap42/ch10/final/c10s06-2.pdf

More details are at

DEFINITIONS, ENGINEERED WOOD HDF LDF LVL MDF MDO OSB

On 2021-08-18 by David

Does particle board contain asbestos? Attached is a pic showing the particle board that is present throughout our home which was built in 1974. The main subfloor is 1-1/2" tongue and groove planks with the particle board on top of that.

The picture [above] is from our living room which is a sunken (by about 4") living room, and what's shown is the face of the edge of the room where it steps up to the adjacent hallway.

I'm going to get a sample of the vinyl sheet and glue tested for asbestos, but removing a sample of the particle board would be difficult to do with disturbing it too much.

Thank you!

Question: I want to work on my heating equipment - does it contain asbestos?

Thank you for your website. I would like to do the work on my furnace safely, and knowing if that material contains asbestos would be helpful. - Mark Seashock

Reply: Examples of visibly detected asbestos on heating equipment

Asbestos duct wrap © D Friedman at InspectApedia.com

Mark, in our articles and photos there are quite a few of asbestos insulation installed on heating equipment, mostly boilers, and I have found asbestos corrugated paper insulation right inside the air plenum some older heating furnaces as well as of course ubiquitous asbestos pipe insulation, and paper duct wrap (photo above).

Some of these materials are unmistakably asbestos-containing as there were not other look-alike products that did not contain asbestos.

Antique heating boiler © D Friedman at InspectApedia.com

In other cases, such as pipe lagging and plasters used on piping elbows, the material content may be more uncertain.

Asbestos duct wrap © D Friedman at InspectApedia.com

If you are in doubt, do not disturb the material, and don't run a conventional (non-HEPA) vacuum cleaner to clean up dust and debris in the area before you have had an inspection by an expert and/or testing by a certified asbestos testing laboratory.

Our photo (above left) shows a coal-fired heating boiler converted to an oil burner, from which asbestos insulation was almost certainly removed. What about that white cementious plaster sealing the combustion chamber doors?

Apparently it was added after the asbestos jacket was removed. Uncertain? Test it. Our photo, above right, shows a traditional asbestos-insulated heating boiler of similar vintage. More details are at


...

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ASBESTOS PHOTO GUIDE to MATERIALS at InspectApedia.com - online encyclopedia of building & environmental inspection, testing, diagnosis, repair, & problem prevention advice.


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