Does natural stone need sealing every year in Ottawa?

Natural stone doesn't necessarily need sealing every year — the frequency depends on the type of stone, its porosity, where it's installed, and how much traffic or moisture exposure it receives.

How Often Natural Stone Actually Needs Sealing

Highly porous stones like marble, travertine, and limestone typically need sealing every 1–2 years in high-use areas like kitchens and bathrooms. Denser stones like granite can often go 3–5 years between sealings, and slate is naturally less porous and may need sealing even less frequently. Porcelain tile, while sometimes mistaken for natural stone, is generally non-porous and rarely needs sealing at all.

The best way to test whether your stone needs sealing is the water droplet test: pour a small amount of water on the surface and wait 10–15 minutes. If the water beads up, your sealer is still working. If the water darkens the stone or absorbs in, it's time to reseal.

Ottawa-Specific Considerations

Ottawa's climate adds some real-world factors. Freeze-thaw cycles affect outdoor stone installations — patios, steps, and entryways — and can accelerate sealer breakdown, meaning outdoor stone may genuinely need annual attention. Indoor stone in high-humidity areas like bathrooms also tends to need more frequent sealing than, say, a low-traffic foyer.

Choosing the Right Sealer

Use a penetrating (impregnating) sealer rather than a topical coating — it soaks into the stone rather than sitting on the surface, giving better long-term protection without altering the appearance. For polished marble or granite, make sure the sealer is rated for polished surfaces so it doesn't dull the finish.

For Ottawa homeowners with natural stone floors, having a professional assess your specific stone and installation during a routine maintenance visit is a smart move. Local contractors can advise on the right sealing schedule for your specific material. Feel free to reach out for a consultation.