Masonry Magazine December 1987 Page. 22
A) METAL SHIELDS
B) FIBER PLUGS
A) TOGGLE BOLTS
B) HOLLOW WALL SCREWS
C) NYLON, PLASTIC AND RUBBER SHIELDS
Shields and Plugs
FIG. 2
fasteners are generally used to attach medium to heavy-weight fixtures. Toggle bolts (made of steel or plastic), hollow wall screws, small diameter sleeve anchors and screws are used to attach fixtures to walls constructed of hollow units (see Fig. 4). These fasteners may be placed in holes drilled through bed joints or through the unit faces into hollow cells (see Fig. 5). Small diameter sleeve anchors, wedge anchors, screws and lag bolt shields (see Fig. 6) are used to attach fixtures to solid masonry and are usually installed in mortar joints (see Fig. 7).
Nails. Case-hardened cut and spiral nails (masonry nails) are often used to attach furring strips to masonry walls (see Fig. 8). If used, the nails should be hammered directly into the mortar joints and not into the brick units. Caution should be exercised when nails are used in single-wythe walls with exposed exterior faces. The nails could open small cracks in the mortar joints, allowing water to penetrate the wall (see Technical Notes 7F for problems associated with water penetration).
Fasteners for Hollow Masonry Units
FIG. 4
Powder-Driven Fasteners.
Powder-driven fasteners are hardened steel pins that are driven into masonry by means of a powder-actuated tool (Fig. 9). The power for the tool is provided by a powder charge typically ranging from .22 to .38 caliber with varying charges, depending on the material and required pin penetration. Powder-driven fasteners
A) PLASTIC SHIELD
B) FIBER PLUG
A) TOGGLE BOLT
C) METAL SHIELD
C) SLEEVE ANCHOR
Shields and Plugs Installed
FIG. 3
2
B) HOLLOW WALL SCREW
D) MASONRY SCREW
Fasteners Installed in Hollow Units
FIG. 5