Porous grouts attract water, dirt, oils, etc. While the tile industry does not require sealing, it is always recommended, especially in wet or high-traffic areas. Penetrating sealers are the most commonly used and offer high water, chemical and stain resistance.
Some people will try to put a sealer on the grout joints, but that doesn't waterproof it. It doesn't work. It only makes it more water resistant.
The Drawback of Using Grout Sealer
Moisture can still pass through most sealers, meaning grout isn't entirely waterproof even when sealed. Over time, grout in areas like bathrooms will naturally stain or show signs of aging, regardless of sealing.
Grout sealer can be applied to grout in order to deter it from absorbing the water. Ultimately, grout sealer is a highly important part of the tiling installation process and should be applied in the majority of projects. Remember: Grout and grout sealer can be a laborious task.
Whoever installed your floors most likely did not seal the grout because it needs time to harden and cure completely.
Unsightly Grout Stains and Discoloration:
One of the most noticeable effects of neglected grout sealing is the gradual accumulation of stains and discoloration. Grout is porous by nature, which means it readily absorbs liquids, dirt, and debris.
Many companies don't automatically include grout sealing in a job with new tile flooring for a few reasons. First, companies can't seal grout until at least 48 to 72 hours after applying grout. By that time, bathroom remodelers typically have already cleaned up from the job and left your home.
PROGRIP WATER REPELLENT TILE GROUT Is a specially formulated grouting compound with exceptional water repellent properties, making it ideal for use in permanently wet as well as underwater conditions, i.e. swimming pools and showers.
Using Too Much Sealant
You might be tempted to use more grout sealer to get the job done quickly, but an excess amount can easily spill over onto the tiles. As a result, unnecessary time will have to be spent scrubbing the excess sealant off.
Bear in mind, grout is not waterproof, only water resistant and once cracked, water is most assuredly going to get behind it and probably damage the wall, unless the wall or floor was properly sealed with something like Kerdi first.
You can seal the grout the day after you applied it or 100 years later. If it isn't dirty, seal all three sides of the shower with a tile sealer or masonry sealer. That will make the grout water-resistant, if not waterproof, and help prevent the growth of mold and dirt.
Epoxy grout doesn't need to be sealed at all.
Standard grout isn't waterproof at all, only epoxy grout is. You can seal regular grout after it dries, but you have to do it every so often or else the grout will begin to absorb water again.
While grout seals the spaces between tiles, it is still porous, meaning water can seep through. Over time, the porous nature of grout allows moisture to penetrate deeper into the wall cavity. This is especially problematic for showers, where water exposure is constant.
Acrylic Grout: Acrylic grout is a great option for wet areas like decks and showers. It's intended to be mildew-resistant and retains its color well. Epoxy Grout: Epoxy grout is less do-it-yourself-friendly than other types.
High-traffic floor grout: Should be sealed every six months to one year. Guest bath and shower grout: Should be sealed every year or two, depending on frequency of use.
This means that while water cannot enter the substrate, any water vapour can still freely travel through the pores and breathe out. The best way to think about an impregnator vs a sealer is that an impregnator waterproofs the substrate itself, while a sealer creates a waterproof film on the substrate.
Porous grouts attract water, dirt, oils, etc. While the tile industry does not require sealing, it is always recommended, especially in wet or high-traffic areas. Penetrating sealers are the most commonly used and offer high water, chemical and stain resistance.
Sealing bathroom shower wall tiles with waterproof sealant will help reduce the risk of damage from water seeping through cracks or between tiles over time. If you want to keep the bathroom floor safe and protected, make sure that your tiles are water-resistant.
Grout sealer can help prevent mold growth to some extent by reducing the porosity of the grout and making it less susceptible to moisture absorption.
The best answer, in a word, is money. It costs more time and material to seal grout and there is little or no perceived benefit (until, of course, the grout gets stained or starts to crack). A superior product would cost more to purchase and install, again for no perceived benefit over the less costly unsealed grout.
The best time to regrout shower and bathroom tiles is when you see mold, grout color changes, or the grout is old, about 15-20 years. Showers need more frequent regrouting because they're wet. Seeing mold or mildew between tiles means it's time for new grout.
Let the sealer sit for about 10 minutes, and then wipe off any excess sealer with a damp towel. Sealers can leave a residue on the tile surface, but don't worry – it should be easy to remove at this point.