| UL
Design
Fire Resistance Directory Guide BXUV
Design No. X536
Rating - 1, 2, 3, and 4 Hr * (See Item 4)
1. Steel Column - Min. size column
W10X49.
2. Structural Framing Members* - Galv. steel clips
spaced 4 ft OC and 1-1/4 in. from top and bottom of column.
Claw International - "THE
CLAW™"
3. Support Angle - No. 25 MSG
galv. steel with 1-1/2 in. legs placed over clips before first layer
of gypsum board and after the second layer of gypsum board when
three or more layers of gypsum board are used. Angle secured to
clips and gypsum board using 1-5/8 in. self-drilling, self-tapping
steel screws, spaced 4 ft. OC and 1-1/4 in. from the top and bottom
of the column. Angle cut 1 in. less than assembly height. Spliced
in angles to occur over clips.
4. Gypsum Board - 5/8 in. thick Type C Board, one
to four layers, see below and Item 5, corner bead.
Canadian Gypsum Company
- Type C or IP-X2
United States Gypsum Co - Type C or IP-X2
Yeso Panamericano S A DE C V- Type C or IP-X2
1 Hour Rating
First layer attached with 1 in. long self-drilling, self-tapping,
type "S" steel screws attached through the gypsum board
and the clips (Item 2), screws spaced 12 in. OC and 1-1/4 in.
from the top and bottom of the column.
2 Hour Rating
Second layer attached with 1-5/8 in. long self-drilling, self-tapping,
type "S" steel screws attached through the gypsum board
and the clips, screws spaced 12 in. OC and 1-1/4 in. from the
top and bottom of the column.
3 Hour Rating
Third layer attached with 1 in. long self-drilling, self-tapping,
type "S" steel screws attached through the support angle
and gypsum board, screws spaced 12 in. OC, starting 9 in. up from
the bottom of the column. Screws placed a min. of 1 in. from the
edge of the board and a max. of 1-1/4 in. from the edge of the
board.
4 Hour Rating
Fourth layer attached with 1-5/8 in. long self-drilling, self-tapping,
type "S" steel screws attached through the angle and
gypsum board, screws spaced 12 in. OC, starting 6 in. from the
bottom of the column. Screws placed a min. of 1 in. from the edge
of the board and a max. of 1-1/4 in. from the edge of the board.
5. Corner Bead - No. 26 gauge
galv. steel, 1-1/4 in. legs attached to gypsum board with 4d by
1-3/8 in. long nails, spaced 12 in. OC, starting 6 in. from the
bottom of the column. Nails placed a min. of 3/4 in. from the edge
of the board and a max. of 1-1/8 in. from the edge of the board.
For each hourly rating, corner bead is to be applied after the final
layer of gypsum board (Item 4) as well as one layer of joint compound. |
