A concrete sealer is a coating applied to poured concrete surfaces, reducing water absorption, protecting against staining, and in some formulations improving resistance to freeze-thaw damage, commonly used on basement floors, driveways, and foundation walls.
Sealers come in several distinct types, from penetrating sealers that soak into the concrete’s pores to film-forming sealers that create a visible protective surface layer.
Choosing the right type depends on the specific application, since a decorative concrete floor and a below-grade foundation wall have quite different sealing priorities and exposure conditions.
What Types of Concrete Sealers Are There?
- Penetrating sealers, absorbed into the concrete’s pores
- Film-forming acrylic sealers
- Epoxy sealers for high-durability applications
- Silicate sealers that chemically react with the concrete
Why Are Concrete Sealers Important?
Applied to a basement floor or foundation wall, a concrete sealer can meaningfully reduce moisture absorption and the associated risk of efflorescence, staining, or gradual surface deterioration, particularly on concrete that’s regularly exposed to ground moisture. On a decorative or finished concrete floor, sealers also protect the surface’s appearance and durability against everyday wear.
As with masonry sealers, it’s worth understanding that a concrete sealer reduces absorption rather than providing the pressure resistance of true waterproofing, meaning a below-grade wall facing significant hydrostatic pressure needs a dedicated waterproofing membrane rather than a sealer alone. Consulting a professional about the specific application ensures the right sealer type is chosen for the job. This guidance helps avoid a mismatch between product and application that could shorten its effectiveness. This care avoids a mismatch that could undercut performance.
Concrete Sealer vs. Silicate Sealer
Concrete sealer is the general category covering multiple sealer chemistries. Silicate sealer is one specific type within that category, working through a chemical reaction with the concrete itself rather than simply coating or penetrating the surface the way other sealer types do.