5/8 drywall or cement board?

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Old 10-13-20, 09:50 AM
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5/8 drywall or cement board?

Just put up a new addition and I have a boiler and h/w heater closet on the first floor. Should I just use the 5/8 fire rated drywall inside the closet or should I use heat cement board? Thanks...
 
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Old 10-13-20, 10:50 AM
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I'm not real familiar with boilers but I know drywall is fine for a water heater.
 
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Old 10-13-20, 11:07 AM
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Cement board or Hardi are not approved fire proofing materials as far as I know. They are not flammable but their cement composition readily transmits the heat of a fire through a wall. The water chemically bound in gypsum (sheetrock) is liberated by a fire's heat. The escaping steam/water vapor provides dramatic cooling which stops the heat of a fire from getting through a wall.
 
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Old 10-14-20, 06:16 AM
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Thanks, I'll go with the 5/8 fire rated drywall....
 
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