(2 customer reviews)


Opaque, bright white, self-priming and breathable mold and moisture resistant waterproofer, block-filler and stain cover for poured, pre-formed and block concrete. Resists up to 23 psi hydrostatic pressure. For both interior and exterior use.

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Opaque, bright white, self-priming and breathable mold and moisture resistant waterproofer, block-filler and stain cover for poured, pre-formed and block concrete. Resists up to 23 psi hydrostatic pressure. For both interior and exterior use.
*Treated Articles Exemption - This product contains an EPA registered antimicrobial to protect the coating from non-public health fungi and odor causing bacteria. No public health claims are being made.


  • Block fills voids and surface pores in concrete block and poured concrete
  • Self-priming to cover stains and discoloration
Seals out moisture from seepage
  • Forms a tough, resistant barrier to harsh environments and contaminants
  • Abrasion- resistant and scrubbable
  • Tintable, Water-based and non-flammable


MasonryGuard is used to protect and seal above and below-grade masonry construction materials including but not limited to poured concrete, pre-formed concrete, brick, concrete block, mortar joints and concrete composites like cementitious siding and cement board. Other surfaces include poured subfloors, piers, structural poured and block formed walls.


Consult SDS for details

Coverage Rate

Up to 105 ft2 per gallon (525 ft2 per pail = 16 wet mils), based upon surface texture, porosity, age and application method. Does not include loss from over-spray or over-use.

Shelf Life & Storage

24 Months

Additional information

Weight N/A

3.5 gal, 5 gal

Use and Instructions


All cementitious surfaces especially in unconditioned and moisture prone areas such as, basements and crawl spaces


MasonryGuard is formulated as a ready- to-use coating and should not be diluted. It can be applied with a brush, roller or airless sprayer to obtain an even finish. Do not apply past the point of run-off. A cross-hatching technique is the best way to ensure sufficient wet/dry film thickness and complete coverage. Consult the Enviroguard New Construction Warranty and Enviroguard Existing Construction Warranty documents for details.

Your Problems

MasonryGuard was designed to solve specific moisture problems.

Masonry is porous. In areas like basements and crawlspaces, unsealed masonry can lead to moisture seepage (physical water) and/or moisture release (water vapor) which can ultimately result in mold growth, efflorescence, structural damage and poor indoor air quality.

Our Solutions

Seals and Fills Tenaciously

MasonryGuard is a penetrating waterproofer that absorbs into masonry and dries fast. It's super strong adhesion comes from the industry's highest rated and tested resin system which "bites and locks" into surfaces for superior, and long lasting protection. MasonryGuard's ability to fill and seal cracks is due to it's industry leading 70%+ solids content.

Double the Product

Most commercially available waterproofers resist between 10-12 psi of hydrostatic pressure. MasonryGuard resists up to 23 psi of hyrdrostatic pressure giving you double the performance, and double the protection.

Uncompromised Moisture Resistance

Due to MasonryGuard's superior resin system, it acts as a permanent barrier on surfaces to prevent moisture content increases. This durable acrylic polymer and ceramic technology provides a long service life that is covered by a 10-15 year existing or new construction warranty.

Award Winning Protection

In 1996, our antimicrobial won the 1996 Presidential Green Chemistry Challenge Award for Designing Safer Chemistries. It's leach resistance ensures a long service life. It's non-persistence in the environment prevents pollution and liability.

Absolute stain blocking

MasonryGuard yields a beautiful, bright white surface that covers ugly stains for a professional, uniform and finished appearance.

Tenacious Durability

MasonryGuard forms a tough, resistant barrier to harsh environments and contaminants.

Uni-Directional Breathability

MasonryGuard is breathable to help prevent the build up of hydrostatic pressure. This works by allowing water vapor to escape from masonry surfaces while preventing absorption from the environment. 

Versatility for all projects

MasonryGuard can seal your new concrete or overcoat existing sealed and painted surfaces giving you one solution to many problems.

Unmatched Warranty

At nearly half the wet mil thickness of other industry leaders, MasonryGuard offers a 10-year limited warranty on existing construction and a 15-year limited warranty on new construction against mold formation on the coating.


Technical Documents

MasonryGuard TDS


MasonryGuard Container Label

2 reviews for MasonryGuard

  1. Wayne Tyra (verified owner)

    It brightens and protects a dark dingy basement

  2. Tim

    We have used MasonryGuard in hundreds of basement situations. This is an EXCELLENT product with better properties than anything else we have seen on the market.

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