Glencoe Carpentry Practice Test

Which drywall type would be used above a tub?

M.R. D.W. Type X Gypsum Board Green Board

Correct Answer:

M.R. D.W.

Explanation:

Moisture exposure in bathrooms is the key factor. Drywall installed above a tub needs to stand up to humidity and splashes without swelling or fostering mold. Moisture-resistant drywall is designed specifically for damp areas, with a core and facing that resist water absorption better than standard gypsum board. This makes it a safer, longer-lasting choice in that location. Fire-rated Type X drywall is focused on slowing fire spread, not moisture resistance, so it doesn’t address the water exposure here. Regular gypsum board absorbs moisture and deteriorates in damp conditions. Green board offers some moisture resistance, but it isn’t intended for frequent wet exposure and can fail over time. So, the best option among these for above a tub is moisture-resistant drywall.

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