Bestwall, perhaps the earliest successful gypsum-board or "drywall" product, in its original composition, was a mixture of wood product and gypsum (Armstrong 1913, 1919) was produced by the first as Compo-Board (Armstrong 1913) and then by BeaverProducts, later by Bestwall Gypsum Company in Ardsmore, PA. Certainteed …

Original company address: Westroc Inc., Mississauga, Ontario, L5J1K4 Canada. Canadian trademarks filed by Westroc included Westroc (cancelled) and Flextec. (inactive) Westroc Canada gypsum board / drywall product names: Note that for products dated 1990 or later you would not expect the product to contain asbestos.

Asbestos can have several definitions, commercial, mineralogical and epidemiological. 1. Mineralogically, asbestos includes certain silicate minerals that have a highly fibrous (asbestiform) structure, are heat resistant and chemically inert, possess high electrical insulating qualities, and are of sufficient flexibility to be woven.The two main groups of …

Drywall systems that may contain asbestos - at least in finishes, taping joint compounds, skim coats, or in systems that applied plaster over gypsum board date from about 1910 through the early 1980's in North America …

Asbestos was widely used in drywall manufacturing across the U.S. as late as the 1970's. As you think about remodeling that basement or spare bedroom this season, demolishing old sheetrock walls or removing ancient paneling might be in your plans. ... then slathered onto the drywall seams with a trowel to join the gypsum boards together. …

Simply put, asbestos encapsulation refers to the actual sealing of asbestos within a protective shell. This is done for a number of reasons, but the main reason is that removing all asbestos materials from some structures is nearly impossible. Therefore, various manufacturers have devised capsules that are meant to contain all asbestos …

Look in your attic for loose-fill asbestos. 2. Check the underside of your roof for a white or gray rough coating. Asbestos spray coating was a commonly used way to insulate a roof and sometimes the sides of buildings. It will look like a rough layer of either white or gray paint.

Painting asbestos ceiling tiles is the seal. So give it enough time to dry up completely (the recommended time is at least 4 hours). When dry, remove the coverings from the furniture, the walls, and the floor. Your asbestos ceiling tiles are now successfully sealed. Photo by Max Vakhtbovych from Pexels.

In joint compound the asbestos content varied but typically was between 3-6%. Even if the gypsum board itself did not contain asbestos this means that by weight the asbestos content of the wall system was about 0.25%. (Redmond 2011), "Sheetrock mud" is a synonym for drywall compound or joint compound that before 1978 may have …

Sheetrock is a brand owned by the United States Gypsum (U.S. Gypsum or USG now) company. However, it was also widely used to refer to drywall or gypsum wallboard that may have contained asbestos, especially …

Wet the surface of the area you are going to take a sample with water and a small amount of detergent before touching it. Cut a small square of plaster out of the wall or ceiling (about 1 – 1½ inches). Make sure you cut through the entire depth of the plaster. Place the sample in a thick airtight plastic bag.

If Installed Before 1980, Both Interior and Exterior Walls May Contain Asbestos. Asbestos in walls can be present in many forms, including concrete, plaster, and drywall. Some walls might also have asbestos …

Your drywall / gypsum board is a Canadian Domtar Gyproc product. The partially-visible coding L30078.48 ... plus the 13 that you added is probably part of a production date stamp used by Domtar for which we have not yet found an age decoder. Stamped on your drywall is. MANUFACTURED TO MEET CSA A82.27M.

That product did contain asbestos. US GYPSUM SHEETROCK ASBESTOS in this article we point out that USG's RED TOP Gypsum Plaster produced between 1920 and ca. 1958 is reported to have contained asbestos and UAF USG RedTop™ Firecode™ plaster made between 1962 and 1969 contained asbestos, probably at ahigher asbestos content level.

Drywall is a common asbestos-containing material (ACM). Read all about asbestos testing procedures for drywall here or call a professional: 1-877-566-6653. ... Examples of the six known types of asbestos can be seen and described in the images and captions below: 1. The most common type of asbestos—chrysotile (or "white asbestos") …

3. Vinyl Floor Tiles. Vinyl has been a popular choice for flooring throughout the modern era, and many building materials manufactured before 1980 had asbestos mixed into them to increase durability. Vinyl is a plastic resin …

[Click to enlarge any image] Asbestos in Drywall or gypsum board products & asbestos content in drywall joint compound, drywall "mud", and textured coatings; includes Chrysotile asbestos, the most common form of asbestos found in products, especially in buildings (serpentine mineral with sheet or layered structure).

The more recognizable applications include vermiculite insulation (shiny accordion-like pebbles) and the thermal insulation wrap on pipes and boiler systems that look like a white body cast. The rest can be impossible to …

Also referred to as sheetrock or gypsum wallboard, drywall products prior to the 1980s were also mixed with asbestos. Drywall is made of a gypsum layer covered with thick backer paper on both sides and was used in walls and ceilings in residential and commercial buildings. The common drywall sheet sizes were: Sizes: 4 x 8, 4 x 9, and 4 x 12 feet

Georgia-Pacific Corporation was founded in 1927 as a hardwood lumber wholesaler. The company and its affiliates, such as Bestwall Gypsum Company, manufactured asbestos materials until the …

[Click to enlarge any image] Photo above: An encaustic heraldic tile used on the ceiling at Cleeve Abbey, dating from the middle ages, late in the twelfth century. ... some of which may contain …

Asbestos was used in a number of National Gypsum Gold Bond™ gypsum board products produced between 1950 and 1970. Asbestos …

Goethite—The brown oxide mineral of soils and iron ore. Graphite—The stuff of pencils has more rugged uses too. Gypsum—Shown in its prettiest form, "desert roses." Halite—Also known as rock salt, this evaporite mineral sits at your table. Hematite—Iron oxide mineral of many forms including this "kidney ore."

USG Company was formed in 1901 as a merger of 30 different independent gypsum companies that operated across the entire country. Around the 1930s, the Great Depression made the US Gypsum Company expand …

There are six distinct types of asbestos: Chrysotile Amosite Crocidolite Tremolite Anthophyllite Actinolite A product or material doesn't have to contain a high concentration of asbestos in order to be …

Legal assistance in asbestos exposure cases for former National Gypsum Company employees and family members. As was the case of approximately one hundred other businesses using asbestos, National Gypsum Company was forced to file for bankruptcy protection in 1990 due to their inability to compensate all former workers who fell ill to …

Considering the fact that asbestos-related diseases may take a long time to develop, it's extremely important that anyone who has a history of asbestos exposure regularly monitor their health. In the interest of promoting the importance of early diagnosis, we are offering screenings free of charge for Gold Bond employees. Call 205.328.9200.

We studied with care all of your pictures and could see what appears to be the edge of rock lath and gypsum board at an electrical receptacle, a switch, and at other wall or ceiling openings. Plasterboard, drywall, and also joint compound used on wall and ceiling surfaces and at joints in the 1960s and up into 1986 might indeed contain asbestos.

Apr 20th 2023. Asbestos in your drywall may seem harmless, but it's a problem you should not ignore for too long if you have the opportunity to address it. Many homes still contain asbestos today, and not in small amounts. Understanding how the material was historically used and its dangers is crucial for safe living if your home is older.

Cemesto-Board,1 1/2 to 2-inch thick 4' x 8' or 12' panels comprised of asbestos-cement panels adhered to a vegetable-fibre core (Celotex sugar cane), first introduced by Celotex in 1937 and described here by …