Should You Seal Porcelain Tile? The Answer May Surprise You
Porcelain tile is known for its durability, but many homeowners wonder if sealing is necessary for this type of tile. With conflicting opinions on whether sealing is beneficial or not, it's a confusing topic. We're breaking down the truth about sealing porcelain tile, including when it's essential and when it may not be needed.
Keep reading to get the definitive answer on if and when your porcelain tiles need sealing!
What is Porcelain Tile?
Porcelain tile differs from ceramic tile due to the finer clay and minerals used during production. The tiles are fired at very high temperatures, making them dense and low in porosity.
There are two main types of porcelain tile:
- Glazed - Has an impervious glass coating on the surface
- Unglazed - Does not have a protective coating
The minimal porosity of porcelain tile makes it very resistant to moisture and staining. However, there are some cases where sealing is still advised.
When Sealing is Necessary
For Unglazed Porcelain Tiles
Although less common than glazed tiles, unglazed porcelain is more porous due to the lack of a glass coating. Microscopic pores in the body of the tile can allow liquids to penetrate and potentially cause stains.
Applying a penetrating sealer fills in these pores to prevent absorption while still allowing the tile to breathe. Sealing unglazed porcelain helps prevent staining and makes cleaning easier.
For Polished Porcelain Tiles
Porcelain tiles with a polished finish help create a smooth, shiny surface. However, the polishing and buffing process can open up miniscule pinholes across the surface of the tile.
Sealing polished porcelain tiles fills in these holes and provides an added layer of protection for the surface. It helps retain the tile's polished sheen against foot traffic and potential scratching over time.
For Outdoor Porcelain Tiles
Outdoor porcelain tiles require sealing for enhanced weather and water resistance. The tile itself is durable, but the grout lines between tiles are more porous.
Applying an outdoor weatherproof sealer to both the tiles and grout joints prevents absorption of moisture that can lead to staining, mildew, and damage from freeze/thaw cycles.
Factors that Affect the Need for Sealing
While porcelain is less porous than ceramic, some installations may still warrant sealing.
- Location - Tiles in bathrooms, kitchens, and other humid areas are more prone to water exposure and potential staining.
- Grout Type - Porous grout is more likely to let moisture through to the tile surface.
- Foot Traffic - High-traffic floors require added protection against wear.
In these situations, sealing porcelain tile provides an extra barrier against moisture and stains.
Types of Sealers for Porcelain Tiles
Choosing the right sealer ensures the optimal result when sealing porcelain tiles.
Penetrating Sealers
Penetrating sealers are formulated to soak into the microscopic pores in porcelain tiles. This provides durable, long-lasting protection against moisture and stains.
However, penetrating sealers require reapplication every few years as they get worn down by cleaning and traffic. They don't change the tile's appearance.
Surface Sealers
Surface sealers bond to the top of the tile surface to create a protective barrier. This repels water, oils, and other liquids from above.
Surface sealers need more frequent reapplication than penetrating types, but provide excellent stain protection in the short term.
Topical Sealers
Topical sealers have a visible sheen when applied to tile. They enhance the glossiness and shine while providing a protective coating.
Topical sealers tend to require frequent reapplication to maintain their aesthetic effect and protective abilities.
How Often to Reseal Porcelain Tiles
Indoor porcelain tiles typically need resealing every 1-5 years depending on traffic patterns and cleaning habits. More frequent heavy-duty cleaners can wear down sealers faster.
Outdoor porcelain tile requires resealing 1-2 times per year due to sun exposure, weather, and seasonal changes.
Look for liquids starting to soak into the tile rather than bead up on the surface as a sign it's time to reseal.
Testing if Your Tiles Need Sealing
It's easy to test whether your porcelain tiles need sealing with a simple water trial:
- Pour a small amount of water directly onto a tile.
- If the water beads up and can be wiped away, the tile does not require sealing.
- If the water starts to soak in, then the tile is absorbent and sealing is recommended.
This mini water test can save you time and hassle before deciding to seal porcelain tiles or not.
Once sealed, porcelain tiles need proper care and maintenance:
- Use only pH-neutral cleaners, as acidic products can degrade sealers.
- Avoid abrasive scrubbing pads which can wear down sealers over time.
- Reseal tiles when liquids are no longer beading up on the surface.
By following the right sealing and care steps for your porcelain tile installation, you can keep them looking pristine for years to come.
Sealing porcelain tile doesn't need to be confusing. While some porcelain varieties don't require sealing at all, unglazed, polished, or outdoor types can benefit. Consider the tile's location and potential for moisture exposure when deciding on sealing.
Protecting your tiles upfront is easier than trying to remove stains later. Our tips clear up the misconceptions so you can make the best choice for your home. Check with your manufacturer or do a quick water test to get your definitive answer on sealing porcelain tiles!