Joint compound (drywall mud) is the material used to seal seams and fasteners on drywall and to skim-coat walls and ceilings. Pre-1980 joint compound formulations frequently contained asbestos. Patching materials and textured coatings may also contain asbestos depending on the era and manufacturer.
Where it's found
Drywall seams, wall and ceiling skim coats, patch repairs, and textured wall finishes in homes and commercial buildings built or renovated through the late 1970s. Often concealed beneath newer paint, wallpaper, or finishes.
When and why
Asbestos-containing joint compound was sold into the late 1970s. Older joint compound may remain in place behind layers of newer renovation work, which is why renovation projects in older buildings frequently uncover suspect material.
How it's tested
Targeted bulk samples are collected from seams, patches, and textured areas using wet methods. PLM analysis with point counting where indicated.
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