Asbestos in drywall is the most significant issue to affect the real estate industry since asbestos. About a month ago, I began fielding calls from several regional lenders concerned about their exposure to Chinese drywall. These lenders, pinched by the broader market conditions - foreclosures and depressed real estate values - worry that asbestos drywall will be a hurdle as they try to clear their books of foreclosed homes.
History of Asbestos Drywall
In 1916, the United States Gypsum Company invented the original Wallboard. This was made of a layer of gypsum covered on both sides by thin flexible papers which added strength and flexibility. The new material had numerous advantages over the plaster method. It was easier to manage, could be nailed immediately to the frame to create a wall, cut into smaller sections as needed and used dry without the need for setting, hence the name Drywall.
The material began to see widespread use after World War II when builders began looking for ways to lower the cost of construction during the rise of suburban areas. The advantages of drywall over plaster made it the material of choice and it can be found in 95 percent of homes and commercial buildings in the United States.
Friable Asbestos Drywall
Composition of Asbestos Drywalls
Calcium Sulphate (Gypsum)
Calcium carbonate
Cellulose
Crystalline Silica
Vermiculite
Potassium Sulphate
Starch
Mica
Fiber Glass
Paraffin Wax
Boric Acid
Types and sizes of Asbestos Drywalls
- Regular drywalls are used for walls and ceilings in homes and commercial buildings.
- Type X drywalls have fibers added to them to make them fire resistant. These are used near kitchens in homes and anywhere fire resistance is a top priority.
- Type C (Improved X) has more fire retardant materials added to make them more fire resistant.
- Green Boards are designed to be water and mold resistant. These drywalls are used in bathrooms in homes.
- Gypsum Core Boards are special 1-inch thick laminated panels used for shaft walls.
- Liner Board Sheetrocks are gypsum boards used for separating wall systems. They are usually ¾ or 1-inch thick.
- Soffit Drywalls are weather resistant and often used for external areas.
- Sheathing Drywalls are used in external walls for structural integrity and fire protection. It is available in treated and non-treated forms for water resistance.
Tools and materials for installing Asbestos Drywalls
1. Drywall Screws
2. Wooden Wedges
3. Sandpaper and Drywall Tape
4. Measuring Tape
5. Chalk Line
6. Dust Mask
7. Utility and Taping Knife
8. Screw Gun
9. Keyhole Saw
10. Straight Edge
11. Joint Compound or Mud
Asbestos Drywall risks and other health related issues
Asbestos Drywall installers can develop health problems from exposure to the material over a prolonged period of time. The following health problems are associated with long-term exposure to drywall :
- Drywall dust can become airborne and cause irritation and inflammation when they come in contact with the eyes. In some cases medical attention may be required.
- Drywall dust can cause skin irritation.
- Inhaling drywall dust can lead to the development of throat and lung problems. It is recommended that installers wear masks/respirators when handling drywall.
- Drywall contains crystalline silica and continuous inhalation can cause Silicosis, a serious lung disease. Mica, another component of drywall is a known cause of Pneumoconiosis, a fatal lung disease.
- Other diseases associated with long-term exposure to drywall dust include tuberculosis, kidney and renal diseases, thickening of the skin, lupus and rheumatoid arthritis.
- To avoid risks associated with drywall, avoid breathing drywall dusts by using respirators, controlling dust during use and disposal and using HEPA rated vacuums or wetting drywall dusts before vacuuming.
Unfortunately, it is impossible to distinguish by visual inspection alone between drywall with asbestos and drywall without. Even modern wallboard contains reinforcing fibers, though they are now generally made of cellulose or fiberglass instead. Asbestos in joint compound is also virtually undetectable with visual inspection. Only a professional test can determine for sure whether or not there is contamination present.