CSLB C-33 Painting & DecoratingSafetyMedium
A painting crew is working on a project that involves sanding drywall and preparing surfaces for painting. Which of the following types of dust is commonly generated during drywall sanding and requires appropriate respiratory protection?
- AGypsum dust
- BAsbestos dust
- CCellulose dust
- DSilica dust
Show answer & explanationAnswer & explanation
Correct answer: A. Gypsum dust
Drywall is primarily composed of gypsum, and sanding it generates gypsum dust. While generally considered a nuisance dust, high concentrations can cause respiratory irritation and may contain some silica, thus requiring protection.
Why the other options are wrong
- B. Asbestos is found in older building materials, not typically new drywall.
- C. Cellulose dust comes from wood or paper products, not the primary component of drywall.
- D. Silica dust is primarily from concrete, masonry, or sandblasting, though some minimal amounts might be in joint compound.
Drywall Dust Hazards
Sanding drywall produces gypsum dust, a particulate hazard that can irritate the respiratory system and may contain trace amounts of crystalline silica.
- Gypsum is calcium sulfate dihydrate.
- Exposure can cause eye, skin, and respiratory irritation.
- N95 respirators are typically recommended for drywall sanding.
Memory trick: Gypsum Generates Greatly Gritty Gunk.