Design No. U905
Bearing Wall Rating - 2 HR.
Nonbearing Wall Rating - 2 HR.
- Concrete Blocks* - Various designs. Classificaon D-2 (2 hr).
- Mortar - Blocks laid in full bed of mortar, nom. 3/8 in. thick,
of not less than 2-1/4 and not more than 3-1/2 parts of clean sharp
sand to 1 part Portland cement (proportioned by volume) and not more
than 50 percent hydrated lime (by cement volume). Vertical joints staggered.
- Portland Cement Stucco or Gypsum Plaster - If used, add 1/2
hr. to Classification. Where combustible members are framed in wall,
plaster or stucco must be applied on teh face opposite framing to achieve
a max. Classification of
1-1/2 hr. Attached to concrete blocks (Item 1)
- Loose Masonry Fill - If all core spaces are filled with loose
dry expanded slag, expanded clay or shale (rotary kiln process), water
repellant vermiculite masonry fill insulation, or silicone treated perlite
loose fill insulation add 2 hr to Classification.
- Foamed Plastic* - (Optional - not shown) 1-1/2 in thick max,
4 ft wide sheathing attached to concrete blocks (Item 1).
Celotex Corp. - Type Thermax
*Bearing the UL Classification Marking
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