In a multi-family building, we are using UL # U341 as the party wall fire assembly to achieve our 1-hr separation. In past projects I have always specified 5/8" Type X gyp. board, one layer each side of the wall. The contractor is questioning the Type X designation of the board. When I re-look at the actual UL Assembly it doesn't specifically call out Type X.
Here's the UL Text:
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2. Gypsum Board* — 5/8 in. thick 4 ft wide. Gypsum board or lath applied horizontally or vertically, unless specified below, and nailed to studs and bearing plates 7 in. OC with 6d cement coated nails, 1-7/8 in. long, 0.0915 in. shank diam and 1/4 in. diam head. As an alternate, No. 6 bugle head drywall screws, 1-7/8 in. long, may be substituted for the 6d cement coated nails.
When Steel Framing Members* (Item 6) are used, wallboard attached to furring channels with 1 in. long Type S bugle-head steel screws spaced 12 in. OC.
When used in widths other than 48 in., gypsum board to be installed horizontally. Any UL Classified Gypsum Board that is eligible for use in Design Nos. L501, G512 or U305. See Gypsum Board* (CKNX) category for names of Classified companies.
The note about UL classified g.b. doesn't apply to this actual assembly...
Help Please! Thank you.
Katrina