American Stairways 1 Hour Fire Rated Folding Attic Stair with Steel Frame
Company: American Stairways, Incorporated
PRODUCT COVERED
American Stairways 1 Hour Fire Rated Folding Attic Stair with Steel Frame
PRODUCT DESCRIPTION
The Listed product is a folding attic stair with wood or aluminum ladder assembly and steel frame that is lined with fire resistant materials in key points on the product to give it a total system fire rating of one hour.
Rough opening Size Ceiling Height Landing Space(1) Projection Hgt (2)
| 22 1/2” x 54” |
8’9” |
58” |
66” |
| 22 1/2” x 54” |
10’ |
65” |
79” |
| 22 1/2” x 60” |
9’3” |
61” |
72” |
| 22 1/2” x 60” |
10’6” |
70” |
84” |
| 25 1/2” x 54” |
8’9” |
58” |
66” |
| 25 1/2” x 54” |
10’ |
65” |
79” |
| 25 1/2” x 60” |
9’3” |
61” |
72” |
| 25 1/2” x 60” |
10’6” |
70” |
84” |
| 30” x 54” |
8’9” |
58” |
66” |
| 30” x 54” |
10’ |
65” |
79” |
| 30” x 60” |
9’3” |
62” |
72” |
| 30" x 60" |
10’6” |
70” |
84” |
*Stair jamb dimensions are -1/8” from rough opening size.
For example, a stair for a 22-1/2” x 54” rough opening will measure 22-3/8” x 53 7/8”, +/- 1/16”.
RATINGS
ASTM E119-05a: 1 hour
An 8’ X 13’ horizontal assembly was constructed using 2X6 dimensional lumber spaced 16” o.c. and fastened to perimeter lumber using two 10d common nails at each joist end. A 30” X 60” rough opening was framed out in the center of the assembly for the insertion of the stair assembly. The exposed side was covered with two layers of 5/8” thick Type X gypsum wallboard. The face layer was attached using 2-1/4” long 8d nails spaced 12”o.c. An 8” wide area around the perimeter of the opening was covered with a single layer of gypsum wallboard to simulate field conditions.
