Asbestos content of Flinkote & Flintkote Stalwart brand buidling sheathing products:
The short answer is "no" for wood-based or plant-based products and "yes" for certain other (not plant-based) LDB or LDF products specifically described as asbestos board; the history is interesting.
This article series describes and provides photographs that aid in identifying various insulating board & fiberboard sheathing materials used on building walls and roofs.
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Flintkote produced a number of asbestos-containing building products.
As we describe here, Flintkote's insulating sheathing was principaly a plant bsed product, not asbestos.
Asbestos claims ultimately led to the Flintkote company's bankruptcy.
So in general, the answer to "is there asbestos in FlintKote insulating sheathing is no, not if the sheathing product is a simple, one-layer brown plant fiber material as we illustrate on this page.
But patent research shows that at least some more complex or layered Flinkote sheathing products included asbestos.
It is quite apparent that the sheet may consist of more than two layers of the asbestos and of the Wool fiber, as for instance the layer of asbestos can be laid between the layers of Wool felt, or vice versa. - Overbury 1925 patent cited below.
Other possible, if uncommon, exceptions as we describe separately
at FIBERBOARD SHEATHING ASBESTOS CONTENT
2018/03/15 jessi said:
Does stalwart sheathing contain asbestos
Illustrations here and at page top: FlintKote building products, Life Magazine, 25 April, 1960.
[Click to enlarge any image]
Jessi
FlinkKote's Stalwart Sheating was a cellulose-based insulating sheathing board widely used in the 1960's in North America.
From what I've been able to find the fiberboard was impregnated with asphalt and perhaps other water-resistant materials such as waxes, and often surfaced with asphalt-impregnated paper or "felt".
Some asphalt-impregnated felts contained asbestos. Generally cellulose board products did not except where cross-contaminated by having been manufactured at a facility that also handled asbestos.
An exception MIGHT be found in some FlintKote products including insulating sheathing that were coated with a bituminous layer that included vermiculite, as you'll read in the patent disclosures below.
The potential for asbestos in these products is that some vermiculite contains asbestos.
The history and ingredients in FlintKote insulating sheathing can be found, at least partially, in patent disclosures assigned to FlintKote
This much-later patent citation
The Flintkote company produced roofing products containing asbestos and also asbestos-cement shingle siding. Asbestos was used in other FlintKote products including the company's ThermalKote a water resistant siding, and in fire-resistant products. For details of which FlintKote products contained asbestos
see FLINTKOTE ASBESTOS PRODUCTS GUIDE
These patents assigned to FlintKote give more details of the history and constituents of FlintKote insulating sheathing
...
Below you will find questions and answers previously posted on this page at its page bottom reader comment box.
Does Flinkote blackboard have asbestos in it?
Has anyone come across this blackboard and know if it has asbestos? Thank you! - On 2023-07-18 by Dan -
This Q&A were posted originally
at SHEATHING, FIBERBOARD ASBESTOS CONTENT
Reply by InspectApedia Publisher (mod)
@Dan,
Your photo shows the identifying logo for Flintkote and in another section the word SHEATHING - that is Flintkote insulating sheathing or what some people more-genericalhy call "blackboard." It does not contain asbestos.
First please read the opening paragraphs of the article above on this page. (No asbestos in general)
Then read and compare your product with other Flintkot products at
FLINTKOTE Stalwart™ SHEATHING ASBESTOS
FLINTKOTE yellow imprint on sheathging: asbestos?
Is this flintkote product in your data base. does it contain asbestos On 2023-04-08 by SUSAN Z HYDE
Replh by InspectApedia Publisher (mod)
@SUSAN Z HYDE,
Thank you for the question and the photo of Flintkote Insulating sheathing board.
That certainly looks like a plant fiber based sheathing product which as you will read In the article above, would not be expected to contain asbestos.
Flintkote wallboard asbestos?
I have a building I'm taking down with two different kinds of sheathing one is burrite and the other is flintkote how do I know if they contain asbestos - On 2016-03-10 by Tim
Reply by (mod) -
Tim to know for certain about your building materials you'd be best served by an inexpensive lab test of a representative sample (about $50 U.S.D.)
Search InspectApedia.com for ASBESTOS TEST LABS to find lab lists & contact information
...
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