The difference comes down to one number: water absorption. Porcelain absorbs 0.5 percent or less. Ceramic absorbs more, often above 3 percent. Everything else follows from that.
Side by side
| Porcelain | Ceramic | |
|---|---|---|
| Water absorption | 0.5% or less | Above 0.5%, often 3%+ |
| Best for | Floors, showers, entryways, outdoors | Walls, backsplashes, light-traffic floors |
| Density | Higher — harder to cut | Lower — easier to work |
| Installed cost | $12–$22 / sq ft | $10–$18 / sq ft |
| Freeze-thaw safe | Yes | No |
Where porcelain is the only sensible answer
Entryways. In Ontario, your entry floor deals with salt, grit and meltwater for five months a year. Porcelain does not care. Ceramic will eventually show it.
Showers and wet rooms. Any surface that stays wet needs the lower absorption. See our shower and wet room tiling guide.
Basements. Concrete slabs release moisture for years. Porcelain is unaffected. More in our note on basement renovations.
Anywhere outdoors. Water absorbed into ceramic freezes, expands and cracks the tile. Porcelain rated for exterior use does not.
Where ceramic makes complete sense
Backsplashes, bathroom walls above the tub surround, laundry room walls, powder room floors. Anywhere without heavy traffic or standing water, ceramic performs perfectly and costs a little less. A classic subway ceramic backsplash is not a compromise — it is the right material for the job.
The PEI rating, briefly
PEI measures surface wear resistance from I to V. For a residential floor you want PEI III or higher. For an entryway, kitchen, or a home with dogs, go PEI IV or V. Wall tile has no meaningful PEI requirement.
And DCOF, which matters more than people think
DCOF is the slip rating. Under ANSI A137.1, any interior floor expected to be walked on while wet needs DCOF 0.42 or higher. That covers every bathroom and entryway. We check this before quoting, because a beautiful polished tile that is dangerous underfoot is not a good outcome.
What about rectified?
Rectified means the tile was mechanically cut to an exact size after firing, so every piece matches. It allows tight 1/8 inch grout joints and a near-seamless look. It costs more and looks considerably better. Both porcelain and ceramic come rectified.
Get a free estimate
Ultra Renovations Inc has been installing tile across Ajax, Pickering, Whitby, Oshawa and the wider GTA for over ten years. We are a registered Ontario corporation, fully insured, and rated 5.0 on Google.
Call (647) 648-8985 or request a free estimate and we will come out, measure properly, look at your subfloor, and give you a written quote for your tile selection at no cost.