Technical Foundation
What Is a Adhesive Anchor?
Adhesive anchors bond a threaded rod, rebar dowel or internally threaded insert into a pre-drilled hole using a two-part resin, transferring load to the surrounding concrete or masonry through chemical adhesion rather than the mechanical expansion used by wedge or sleeve anchors. Because there's no expansion force, adhesive anchors can be placed closer to edges and to each other than mechanical anchors of comparable capacity, and they perform well in cracked concrete when the specific system is rated for it.
Resin chemistry determines cure time, temperature range and chemical resistance: epoxy systems offer the highest bond strength and are the standard choice for structural and cracked-concrete applications; vinylester cures faster and resists higher temperatures; polyester is the fastest-curing and most economical but generally limited to non-structural or solid-base uses. Every structural adhesive anchor system is qualified under an ICC-ES evaluation report (ESR) specific to the resin, hole-cleaning method and base material — installation must follow that ESR's hole preparation and cure-time instructions exactly, since deviation voids the rated capacity.
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| Spec | What It Means | Why It Matters |
|---|---|---|
| Resin Chemistry | Epoxy, vinylester, polyester | Determines bond strength, cure time, temperature range and suitability for cracked concrete |
| ICC-ES Evaluation Report | ESR number specific to system and base material | Documents the tested, code-compliant load capacity — required for any structural application |
| Base Material | Cracked/uncracked concrete, solid masonry, hollow block | Hollow base materials require a screen tube to contain resin; capacity differs significantly by substrate |
| Cure Time | Minutes to hours, temperature-dependent | Determines how soon the anchor can be loaded; cold temperatures extend cure time substantially |
| Rod/Rebar Diameter | 3/8 in to 1-1/4 in threaded rod, #3-#11 rebar | Sets hole diameter and embedment depth per the ESR's published design tables |
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Applications
Where Adhesive Anchors Get Used
Adhesive anchors are specified wherever load must be transferred into existing concrete or masonry without the edge-distance and spacing penalties of mechanical anchors.
Structural Concrete Retrofit
Post-installed rebar dowels bonding new concrete pours to existing structural elements in additions and seismic retrofits.
Commercial Construction
Threaded rod anchoring for structural steel base plates, curtain wall attachments and mechanical equipment mounts.
Industrial Equipment Installation
High-capacity anchoring for machinery, racking and process equipment baseplates into existing concrete floors.
Infrastructure & Bridge Repair
Cracked-concrete-rated epoxy systems for barrier rail, expansion joint and bridge deck attachment work.
Masonry & Renovation Work
Screen-tube systems for anchoring into hollow CMU block in renovation and building envelope projects.
MRO & Facilities Maintenance
Anchoring brackets, guardrails and equipment supports into existing concrete during facility upgrades.
FAQ
Adhesive Anchors Questions, Answered
How is an adhesive anchor different from a mechanical (wedge) anchor?
A mechanical anchor develops holding capacity through expansion force against the sides of the drilled hole, which requires minimum edge distance and spacing to avoid cracking the concrete. An adhesive anchor bonds chemically along the full embedment length with no expansion force, so it can be installed closer to edges and other anchors, and it generally performs better in cracked or lower-strength concrete — provided the specific resin system is ESR-rated for that condition.
Why does hole cleaning matter so much for adhesive anchors?
Bond strength depends on the resin contacting clean concrete, not drilling dust — every ICC-ES evaluation report specifies an exact hole-cleaning procedure (typically blow, brush, blow, repeated a set number of times) for that system, and skipping or shortcutting it can reduce actual capacity well below the rated value even though the anchor appears installed correctly. This is the single most common cause of adhesive anchor failure in the field.
What's the difference between epoxy, vinylester and polyester resin?
Epoxy generally has the highest bond strength, the widest ESR coverage for structural and cracked-concrete use, and the longest working time. Vinylester cures faster and tolerates higher service temperatures, often used where quick turnaround or elevated heat is a factor. Polyester cures fastest and costs least but is typically limited to non-structural applications or specific solid-base conditions — check the ESR before substituting one chemistry for another.
Can adhesive anchors be used in hollow block or brick?
Yes, but they require a screen tube (a perforated sleeve inserted into the hole) to contain the resin within the hollow cavity and create a solid bond area, since resin injected directly into an open cavity would simply run out. The screen tube system and its rated capacity are documented separately from solid-base systems in the manufacturer's ESR.
Do I need a licensed installer or special certification for structural adhesive anchors?
Many jurisdictions and project specifications require installer certification (such as ACI/CRSI Adhesive Anchor Installer Certification) for structural applications, particularly overhead or sustained-tension installations, because improper installation is difficult to detect visually after the resin cures. Confirm certification requirements against the project's structural specifications before installation begins.
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