Adhesive anchor in a hollow block wall

See the anchor manufacturer’s instructions before connecting the anchor to a hollow block wall.

Push an umbrella anchor into the hole until the umbrella unfolds in the block cavity. Inject adhesive into the umbrella. Slowly insert stud or fastener with a twisting motion.

DO NOT LEAK ADHESIVE ON THE THREADED PORTION OR CLEAN WITH SOLVENT. The threaded area must be free of debris to attach to a threaded rod or steel bolt.

Concrete screw

Drill bits may be specifically sized for each manufacturer, and typically are smaller diameter than nominal or fractional diameter of a screw. Install a concrete screw with a rotary drill and bolt the head attachment.

Toggle bolt

Hold the toggle flat alongside the plastic straps and slide the channel through the hole. Slide the holding ring toward the wall until the channel is flush with the wall. Cut off the straps at the holding ring. Insert the bolt with a rotary drill over the bracket or equipment mounting.

Step 6: Set the anchor (adhesive only)

Allow enough time for the adhesive to harden and adhere to the concrete. This may take several hours.

Step 7: Set the equipment and tighten the anchors

Tighten the anchor bolt to the proper torque setting shown in the anchor manufacturer’s instructions or construction drawings.

In-filled block walls will have gaps in the grout fill or the grout will slightly crack, requiring anchors to be installed in the center of the cell.

If the grout cracks severely, or if you miss a grouted block, the anchor will not tighten and will pull out. If it pulls out, move the anchor to a new centered cell location.