When installing drywall in a bathroom, what type of drywall should be used in wet areas?
Correct Answer
C) Purple board (mold-resistant) or cement board
Purple board (mold-resistant drywall) or cement board should be used in wet areas like shower surrounds. These materials provide better moisture and mold resistance than green board or regular drywall.
Why This Is the Correct Answer
Purple board (mold-resistant drywall) and cement board are specifically engineered for wet areas like shower surrounds and tub enclosures. Purple board contains enhanced moisture and mold-resistant additives that far exceed the capabilities of green board. Cement board is completely waterproof and provides the best substrate for tile installations in wet areas. These materials meet current building codes for wet area applications where direct water exposure is expected.
Why the Other Options Are Wrong
Option B: Fire-rated Type X drywall
Regular gypsum drywall has no moisture resistance and will quickly deteriorate, swell, and develop mold when exposed to moisture in bathroom wet areas, making it completely unsuitable for these applications.
Option D: Regular gypsum drywall
Green board (moisture-resistant drywall) was commonly used in the past but is no longer considered adequate for wet areas like shower surrounds, as it only provides limited moisture resistance and can still develop mold problems over time.
Memory Technique
Use the color progression: White (regular) < Green (moisture-resistant) < Purple (mold-resistant) - Purple is the 'royal' treatment for wet areas that deserve the best protection.
Reference Hint
Florida Building Code Chapter 25 - Gypsum Board and Plaster, or IRC Chapter 7 - Wall Covering sections dealing with moisture-resistant materials
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