Choose a Masonry Wall Anchor by What It Grips

The right anchor for a masonry wall depends on the material at the hole—not simply whether the wall is called brick or block. For a light attachment, start by evaluating a masonry screw with published load data for that substrate. For hollow block, consider a hollow-masonry-rated screw, toggle or adhesive system with a screen tube. For structural connections, select from documented masonry anchor systems using the connection’s design loads.

This guide covers fastening brackets, fixtures and framing to an existing wall. Connectors that hold masonry to its supporting frame, or tie separate masonry wythes together, are a different task; see anchored masonry veneer. CMHA distinguishes these connector functions.

Identify what the anchor will grip

Check drawings and the actual attachment location before buying fasteners:

• Hollow concrete masonry unit (CMU): The anchor may grip only the face shell or bear against its inside surface. A longer fastener does not automatically gain more grip once it enters the empty cell.
• Grouted CMU: Confirm grout at the proposed hole. Do not assume every cell is filled because the wall contains reinforcing steel.
• Clay brick: Establish whether the unit is solid or hollow and whether its condition matches the anchor’s published requirements.
• Mortar joint: Use joint placement only where the selected product’s technical data permit it. A value for anchoring into the unit is not automatically valid in mortar.

CMHA identifies separate fastening locations in mortar joints, hollow-unit face shells and solid or solidly grouted masonry, and directs users to product-specific substrate and face-shell requirements. Its fastener guidance explains why these distinctions matter. For wall anatomy, see concrete blockwork wall parts.

If the attachment passes through veneer to reach a backing wall, treat it as a connection detail—not just a longer-anchor purchase. The backing must carry the load, and the stand-off, finish and weather barrier need coordination.

Compare anchor mechanisms

Anchor type	How it holds	Selection check
Masonry screw	Cuts threads into a predrilled hole	Published data must cover the actual unit, joint or grouted condition and embedment
Sleeve or other expansion anchor	Expands against the hole wall	Confirm the exact product is suitable for the masonry and hole location; expansion can split or break out masonry
Toggle rated for hollow masonry	Opens behind the face shell and bears against it	Check shell thickness, cavity clearance and permitted loads; drywall ratings are not masonry ratings
Adhesive anchor with rod or insert	Transfers load through cured bonding material	Match adhesive, steel element, hole preparation and substrate; use the specified screen tube where required

These mechanisms and their failure modes are described in CMHA’s masonry fastener guidance. Do not substitute a concrete-only wedge anchor merely because its diameter matches the specified masonry anchor.

An adhesive anchor is a system, not generic epoxy plus threaded rod. For example, the January 2026 ICC-ES report for Hilti HIT-HY 270 specifies components for grouted CMU and plastic-mesh screen tubes for its ungrouted CMU and clay-brick applications. Its substrate, placement, loading and special-inspection requirements still apply; that report does not qualify every adhesive for every wall.

Size the connection, not just the fastener

An attachment’s weight is only the starting load:

• Shear acts along the wall, such as the downward load from a fixture.
• Tension pulls the anchor away from the wall.
• Bracket projection creates a turning moment, which can pull on the upper anchors while the bracket bears against the wall below.

For illustration, a 100 lb downward load acting 12 inches horizontally out from the wall creates a 1,200 lb-in. moment, before load factors or other forces. That is why dividing 100 lb by four anchors is not a complete connection check.

Use published masonry capacities with their accompanying conditions: embedment, unit strength, edge distance, anchor spacing and group effects. Do not treat an ultimate test load as an allowable working load or multiply a single-anchor rating by the anchor count without checking the layout. CMHA identifies masonry splitting, breakout, pullout, steel failure and adhesive bond failure among the possible governing failures.

For ledgers, guards, canopies, equipment supports or other consequential connections, obtain a designed detail. If the wall condition falls outside published data, have the designer determine whether testing or another load path is needed.

Installation checks before loading

1. Mark approved locations. Check wall edges, openings, joint restrictions, reinforcement and concealed services. Resolve cracked or deteriorated masonry before fastening.
2. Select length from the detail. Allow for fixture thickness, washers or nuts, and the required effective embedment. Finish thickness and empty cavity space are not masonry embedment.
3. Drill the specified hole. Follow the product’s bit diameter, depth and drilling-mode instructions. An oversized or damaged hole is not corrected by extra tightening.
4. Clean as specified and control dust. Follow the anchor’s hole-cleaning procedure, especially for adhesive systems. On U.S. construction sites using OSHA Table 1 for handheld or stand-mounted drills, use the specified shroud or cowling with dust collection. The collector must provide at least the tool manufacturer’s recommended airflow, a filter with at least 99% efficiency and a filter-cleaning mechanism. Table 1 also requires a HEPA-filtered vacuum when cleaning holes. See OSHA’s silica standard.
5. Set and inspect. Use specified torque or setting procedures, compatible corrosion protection and any required inspection. For adhesive anchors, observe the specified cure schedule for the installation temperature before tightening or loading; ESR-4143 explicitly prohibits tightening before full cure.

Keep the approved anchor designation, installation instructions and hole layout with the work package. If an anchor spins, the shell breaks or the hole lands in an unexpected void, stop and resolve the connection rather than substituting a larger fastener on the spot.