Homeowner decision guide
Reviewed and updated September 22, 2026
Air entrainment creates a controlled system of small air voids that helps concrete accommodate pressure associated with freezing water. It is important when exterior concrete will experience the relevant wet freeze-thaw exposure. These intentional microscopic voids are different from large placement defects such as honeycombing.
Tell the contractor where the concrete will be used, whether it is exposed to freezing and wetting, and what deicers or other salts it may encounter. Ask the designer or supplier to confirm the appropriate mixture requirements for those conditions.
Use the sections that match what you can safely observe. They add context without diagnosing the property from a distance.
Why is air entrainment important for exterior concrete in freeze-thaw climates?
Do not choose the air requirement from a generic nationwide percentage. Aggregate, mixture specification and exposure affect the appropriate requirements.
Why is air entrainment important for exterior concrete in freeze-thaw climates?
Air entrainment does not replace suitable finishing, curing or drainage. NRMCA's scaling guidance treats freeze-thaw surface performance as a combination of material and construction factors, not a guarantee attached to one ingredient.
Ask how the delivered mixture will be checked and how exterior-concrete finishing and curing will be managed.
Why is air entrainment important for exterior concrete in freeze-thaw climates?
Keep the original specification and delivery or testing records. Photograph the affected surface and note the timing, wetting pattern and maintenance history.
A photograph of scaling cannot establish the original air content or prove one cause. Request an assessment that considers the exposure and the complete installation.
Before a new pour: obtain a mixture specification suitable for the climate and use, plus a plan for placement and curing. “Air-entrained” is an important requirement where applicable, but it is not a promise that every winter-related problem is impossible.
Tell the contractor where the concrete will be used, whether it is exposed to freezing and wetting, and what deicers or other salts it may encounter. Ask the designer or supplier to confirm the appropriate mixture requirements for those conditions. Do not choose the air requirement from a generic nationwide percentage. Aggregate, mixture specification and exposure affect the appropriate requirements.
Notice next: Do not choose the air requirement from a generic nationwide percentage. Aggregate, mixture specification and exposure affect the appropriate requirements.
Air entrainment does not replace suitable finishing, curing or drainage. NRMCA's scaling guidance treats freeze-thaw surface performance as a combination of material and construction factors, not a guarantee attached to one ingredient. Ask how the delivered mixture will be checked and how exterior-concrete finishing and curing will be managed.
Notice next: Air entrainment does not replace suitable finishing, curing or drainage. NRMCA's scaling guidance treats freeze-thaw surface performance as a combination of material and construction factors, not a guarantee attached to one ingredient.
Keep the original specification and delivery or testing records. Photograph the affected surface and note the timing, wetting pattern and maintenance history. A photograph of scaling cannot establish the original air content or prove one cause. Request an assessment that considers the exposure and the complete installation. Before a new pour: obtain a mixture specification suitable for the climate and use, plus a plan for placement and curing. “Air-entrained” is an important requirement where applicable, but it is not a promise that every winter-related problem is impossible.
Notice next: Ask how the delivered mixture will be checked and how exterior-concrete finishing and curing will be managed.
Use safe, visible observations and existing records only.
These observations organize the next conversation; they do not diagnose the property or authorize work.
Air entrainment creates a controlled system of small air voids that helps concrete accommodate pressure associated with freezing water. It is important when exterior concrete will experience the relevant wet freeze-thaw exposure. These intentional microscopic voids are different from large placement defects such as honeycombing. Tell the contractor where the concrete will be used, whether it is exposed to freezing and wetting, and what deicers or other salts it may encounter. Ask the designer or supplier to confirm the appropriate mixture requirements for those conditions.
Do not choose the air requirement from a generic nationwide percentage. Aggregate, mixture specification and exposure affect the appropriate requirements. Air entrainment does not replace suitable finishing, curing or drainage. NRMCA's scaling guidance treats freeze-thaw surface performance as a combination of material and construction factors, not a guarantee attached to one ingredient. Ask how the delivered mixture will be checked and how exterior-concrete finishing and curing will be managed.
This national guide cannot diagnose the property, verify a provider, or confirm address-specific availability. Permits, adopted codes, licenses, property responsibility and product instructions must be confirmed for the actual location and scope.
The explanation, safe observations and preparation questions apply as general U.S. homeowner guidance.
Confirm permits, adopted codes, licensing, property responsibility and service scope for the actual address.
A ZIP code may help screen service availability; it does not establish a local rule, price or provider commitment.
This national guide cannot diagnose the property, verify a provider, or confirm address-specific availability.
Permits, adopted codes, licenses, property responsibility and product instructions must be confirmed for the actual location and scope.
A symptom or photograph does not prove the concealed condition, exact cause or final repair scope.