If your shower grout is cracking, crumbling, or coming out in chunks, you’re not alone — it’s one of the most common things we get called about in Eagle, and it’s one of the most misunderstood. Most people assume cracked grout means the whole shower needs to come out. Sometimes it does. A lot of the time, it doesn’t. Here’s how to tell the difference, and what a proper regrout actually involves.
What grout does — and why it fails
Grout fills the joints between tiles. It’s not what makes a shower waterproof — the waterproofing underneath does that — but it protects the edges of the tile, keeps water from sitting in the joints, and holds the whole surface together. Grout is cement-based, which means it’s porous and it moves a little with the house. In Idaho that matters: freeze-thaw cycles, a slab that shifts seasonally, and hard water all work on grout over time.
The usual failure signs:
- Hairline cracks along the grout lines, especially in corners and where the wall meets the floor or tub
- Crumbling or missing grout — you can pick pieces out with a fingernail
- Discoloration that won’t clean — dark staining that survives scrubbing usually means moisture is sitting in the grout, not just on it
- Loose or hollow-sounding tiles — this one matters more than the rest, because it can mean water has already gotten behind the tile
A few hairline cracks in an otherwise solid shower is a regrout job. Loose tiles, soft drywall behind the tile, or a shower floor that flexes is a bigger conversation — that’s the waterproofing or the substrate failing, and new grout on top of it is lipstick on a problem.
When a regrout fixes it
A regrout makes sense when the tile itself is solid, the shower drains right, and the damage is limited to the grout lines. The process is straightforward but it’s not a caulk gun and an afternoon:
- The old grout comes out. Not just the loose bits — the failed grout gets cut out to a consistent depth so the new grout has something to grab. Skipping this step is why DIY regrouts pop out again in six months.
- Everything gets cleaned. Soap scum, hard-water scale, and any mold in the joints come off before new grout goes in. New grout over dirty joints doesn’t bond.
- New grout goes in, properly mixed and packed. Then it cures — and cure time matters. A shower that’s used too soon after grouting will wash out joints before they set.
- It gets sealed. This is the step that gets skipped most often, and it’s the one that decides how long the repair lasts. Sealer soaks into the grout and slows down how fast it absorbs water and stains. In a shower that gets used every day, sealing is not optional.
A regrout done this way buys a solid shower years of life. A regrout done with a tube of premixed grout smeared over the old stuff buys you a few months and a second bill.
When it’s time to retile instead
Be straight with yourself about this one. Regrout when the tile and the wall behind it are sound. Retile when:
- Tiles are loose, hollow, or falling off
- There’s softness or give in the wall when you press on the tile
- You can see staining or mold coming through from behind the tile
- The shower floor doesn’t drain and water ponds in a corner
- The grout has failed more than once in the same spots
In those cases the problem is behind the tile, not in the joints, and no amount of new grout fixes it. A full tile shower rebuild with us runs $1,900–$3,200 for a standard-size shower — that’s the real number for a proper job with real waterproofing underneath, not a patch. If you’re already looking at a second or third grout repair on the same shower, the math usually favors doing it once, right.
Grout cleaning vs. grout repair — don’t confuse them
A lot of what looks like failed grout is just dirty grout. Hard water here leaves mineral buildup that turns grout gray or brown, and no amount of scrubbing with a household cleaner touches it once it’s set in. A professional cleaning can bring grout back to a color you forgot it was.
But cleaning and repair are different jobs. If the grout is cracked or missing, cleaning doesn’t fix it — it just makes the cracks easier to see. And if the grout is stained because water is getting into it from behind, cleaning the surface changes nothing. We’ll tell you which one you’ve got when we look at it. Sometimes the honest answer is a cleaning and a fresh coat of sealer, and that’s a much smaller bill than a regrout.
Sealing: the part that keeps it fixed
Fresh grout should be sealed, and old grout should be resealed on a schedule — generally every year or two in a shower that sees daily use, less often on a floor that stays dry. Sealer doesn’t make grout waterproof. It buys time: water beads instead of soaking in, soap scum wipes off instead of staining, and the grout lasts years longer between repairs.
The sealer has to go on clean, dry grout, and it has to be the right kind for the grout you have. Spraying sealer over dirty or damp grout is money on the floor — it won’t bond and it’ll peel off in the shower within weeks.
What it costs
Grout work prices off the size of the area and how much grout has to come out — a small shower floor is a different job than a full shower surround with a niche and a bench. We don’t quote it off a photo, because the condition of the tile and what’s behind it changes the job. What we do is come look, tell you straight whether it’s a regrout, a cleaning, or a retile, and give you a written price for the right one. The estimate is free anywhere in the Treasure Valley — Eagle, Boise, Meridian, Nampa, Star, Kuna, Caldwell, Middleton, Garden City.
Get a look at it
If your grout is cracking or crumbling, don’t wait on it — every shower you take with open grout joints is water getting one step closer to the wall behind the tile. Call (986) 273-5409 and we’ll come take a look, tell you whether it’s a regrout or something bigger, and give you a straight price. No pressure, no obligation — just an honest read on what your shower actually needs.
Boise Home Flooring — the interior division of Boise Epoxy Flooring Co. (BEFCO), based in Nampa. 18 years in the trades. Tile, LVP, laminate, hardwood, and trim.