Brick Cavity Wall Shelter Specifications

ROOF SLAB
4" reinforced concrete slab (fc'=2500 psi); minimum #4 rebar at 12" O.C. each way, placed at mid-depth of slab.

WALLS
9" brick cavity wall; 2 wythes of 3" brick with a 3" cavity; reinforce with #4 at 12" O.C. each way. Horizontal bars shall continue around corner for at least 12".

CAVITY
All cavities shall be clean prior to filling with pea gravel concrete (fc'=2500 psi).

DOOR OPENING
Place one additional #4 bar around opening.

DOOR
Metal door frame shall be anchored to masonry wall with tee anchors (4 per jamb). Use 1-1/2" laminated plywood door covered on the outside with 11 ga. (t0.1196 in.) steel plate attached with screws at 6" O.C. around perimeter of door.

Alternate: Use 16 ga. Hollow metal door covered on the outside with 11 gage (t0.1196 in.) Plate attached with metal screws at 6" O.C. around perimeter.

Either swing doors shall be provided with through bolted slide bolts top and bottom equal to Glenn Johnson #1718-t.

(Note: A sliding door may be substituted for a swinging door. When closed the sliding door shall be supported continuously at head and jamb. Door must resist both inward and outward pressures.)

ANCHORAGE
Roof slab shall be anchored to top of wall with #4 rebar at 12". O.C. around perimeter of wall. Walls shall be anchored to slab at each corner and at 12" intervals of each wall with 1 - #4 rebar dowel. These dowels shall be set in an existing slab with suitable epoxy anchors. If a new slab is cast, the dowels shall have a minimum of 12" embedment.

The bars shall extend into the masonry wall a minimum of 12". Other equivalent methods of anchorage are acceptable.

VENTING
Provide two 6" diameter openings in roof slab for venting purposes. These should be slanted or fitted with a steel pipe elbow so as to prevent debris from passing straight through to strike an occupant or the openings should be protected with a "saddle" or with other covers to prevent debris passage.