Should I seal the brick?

In most cases, no.
For properly designed and installed vertical brick applications, sealant is usually not needed and is often discouraged. Brick is naturally breathable. Applying the wrong sealant can trap moisture, which may lead to efflorescence, spalling, or surface damage over time.

That said, there are specific situations where sealing is recommended, and one important product exception to note.

When Sealant Is Recommended

Sealant should be considered in these situations:

• Interior flooring
  Thin brick flooring should be sealed, especially in kitchens, entryways, and other high-traffic areas. Sealing helps reduce staining and surface wear.

• Backsplashes and high-mess areas
  Sealing makes brick and grout easier to clean in kitchens, bars, and similar spaces. A flat or natural-finish masonry sealer is typically preferred.

• Severe exterior exposure
  In areas with heavy wind-driven rain or repeated saturation, a breathable penetrating water repellent may be appropriate for features like chimneys, parapets, copings, and sills.

• Appearance preference
  Some sealers darken the brick or create a wet or glossy look. Sealing may be used if that appearance is desired.

When Sealant Is Not Recommended

Avoid sealing in these cases:

• New exterior installations
  Do not seal freshly installed exterior brick. Allow at least 30 days, and ideally up to one year, for curing and normal efflorescence to dissipate.

• To fix leaks or construction issues
  Sealants are not a substitute for proper flashing, drainage, or mortar repairs. The underlying issue must be corrected first.

• Exterior brick floors in freeze-thaw climates
  Sealing exterior brick pavements in freezing regions can increase the risk of freeze-thaw damage.

• Dirty or damp surfaces
  Never apply sealant over moisture, dirt, or efflorescence. These conditions will be locked in permanently.

General Sealant Guidelines

If sealing is appropriate:

• Exterior applications
  Use only breathable penetrating sealers such as silane or siloxane products.
  Do not use film-forming coatings like acrylics or urethanes outdoors.

• Interior applications
  Film-forming sealers may be used indoors when added protection or easier cleaning is desired.
  For a flat, natural look that does not change color, Old Mill commonly recommends Miracle 511 Impregnator.

• Always test first
  Sealers can slightly darken brick or change sheen. Always test in a small, hidden area and allow it to fully dry before sealing the entire surface.

Important Product Exception: Tahoe Thin Brick

Tahoe Thin Brick must be sealed. This is required.

Tahoe bricks include a lime-based surface treatment that requires a polymeric sealer to withstand cleaning, abrasion, and normal weathering.

Key requirements for Tahoe Thin Brick:

• Sealing is mandatory.

• A polymeric sealer must be used.

• Bricks may be sealed before or after grouting.

• If sealing after grouting, use a grout bag only. Do not smear grout.

• Never use acids or acid-based cleaners, even after sealing.

• Old Mill recommends NanoPave JSS Natural by Techniseal, a water-based, VOC-free polymeric sealer that leaves little to no sheen when applied correctly.

• Typical coverage is 225 to 250 square feet per gallon.

• Always test the sealer in an inconspicuous area first.

Care and Maintenance

Brick is low maintenance, not no maintenance.

• Start with dry cleaning methods, then use mild detergent and water if needed.

• Avoid acidic or harsh cleaners.

• If efflorescence appears, dry brush it off before using water.

• Sealers wear over time and may require reapplication depending on exposure and use.

• Inspect brick surfaces annually for wear or moisture issues.