How To Look At A House
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What is the difference between Type X and regular gypsum drywall? Where is it required?
Wednesday, June 20, 2018
Type X is sometimes referred to as fire-rated drywall, and here are three ways that it differs from regular gypsum drywall:
1) Standard drywall is 1/2” thick, but Type X is 5/8” thick.
2) Type X has glass fiber reinforcement in the gypsum core and other additives to help it resist fire longer.
3) Type X must be third-party certified by an independent testing and listing agency such as UL (Underwriters Laboratories Inc.) and ULC (Underwriters Laboratories of Canada) to meet the fire performance requirements prescribed in the ASTM C1396 (CAN/CSA-A82.27) Standard Specification for Gypsum Board. It’s worth noting that, although Type X drywall is often called “one-hour fire rated,” a wall assembly with Type X on both sides and 2x4 stud framing meets the one-hour rating, but the board by itself does not.
Type X drywall is required for the ceiling of a garage when there is habitable space above, and also at the common wall between units of a duplex or row to townhouses if not masonry.
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