Repair Commercial Core Holes

CorPlug plug installed to repair commercial core holes safely

Abandoned slab penetrations are more than a cosmetic issue—they can reduce fire-resistance continuity, complicate inspections, and slow down the schedule of the tenant improvement. That is why we have designed a patented, precast floor plug called CorPlug, an assembly tested and approved to comply with E318A 2-hour fire rating. When owners and contractors need to repair floor core holes quickly and correctly, CorPlug is the only solution that supports safety, efficiency, and affordability from day one.

What CorPlug Is Built To Do

CCorPlug is a precast concrete infill assembly engineered to close abandoned round openings in commercial concrete floor systems. This product is designed to work with specified sealant and installation steps, so the repair is uniform across multiple locations, floors, or buildings. Instead of improvised patches that vary by crew, CorPlug delivers a standardized repair that reduces rework risk and improves predictability for schedule and cost.

Install From Above To Reduce Disruption

Gaining access below a slab can mean removing ceilings, coordinating lifts, or working around occupied space. CorPlug’s from-above installation system helps to repair commercial core holes without turning the floor below into a demolition zone. This reduces trade conflicts, avoids tenant disruption, and supports faster punch-list completion, especially on active sites where downtime is expensive.

Fire-Resistance, Documentation, and Closeout Support

A core repair is life-safety work, and details drive outcomes. We can aid in identifying opening conditions, confirm sizing, and suggest surface preparation so the plug seats properly and the sealant performs as intended. Ready to eliminate abandoned core risks? Contact CorPlug today to review your core sizes, aid in selecting the right sizes, and plan a clean, compliant installation.

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Frequently Asked Questions

1How should we sequence repairs on multi-floor tenant improvement projects to avoid bottlenecks?
We recommend mapping all abandoned openings early, then batching repairs by floor and trade readiness. If coring, sawcutting, or overhead work is still ongoing, schedule repairs after the most debris-producing activities to prevent contamination. A staged plan also helps keep inspection walk-throughs focused and reduces last-minute rework.
2What should an owner keep on file for long-term compliance and future renovations?
In addition to submittals, we suggest storing a location plan that marks every repaired opening with a unique identifier. Include date-stamped photos, installer information, and a brief note on any edge prep or special conditions encountered. This record helps future project teams avoid drilling into repaired areas and supports consistent facility standards.
3How do we handle openings that are chipped, out-of-round, or larger than expected?
Irregular openings should be measured in multiple directions, recorded, and evaluated for edge stability before selecting a plug. In some cases, additional surface preparation or localized repair may be needed to achieve a proper seat and seal. When conditions are outside normal tolerances, involving a qualified professional early helps prevent failed inspections and repeat mobilizations.

The president/inventor of CorPlug, Inc., has over 30 years experience in the commercial construction industry in every capacity from project manager to construction company owner. He has seen the result of improper abandoned core repair on numerous occasions. These poor repairs have resulted in the need to expend significant time and materials to repair the damage caused.

After careful development and design that would solve this problem economically, CorPlug was born. Once perfected, CorPlug was tested by an independent testing laboratory to determine if, in fact, it restored the floor system to its original fire retarding properties.

The CorPlug being sold today meets these criteria:

Easily installed from above, flush with the existing floor, and most importantly, restores the fire retardant properties of the floor system. All at a cost significantly less than required to restore the abandoned core using traditional approved procedures.

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