+Why does my shower grout keep turning black after I clean it?
Cement grout is porous, and in a bathroom that never fully dries, moisture sits in the joints long enough for mold to colonize below the surface — where scrubbing can't reach. Recurring black grout is a moisture problem, not a cleaning failure. The lasting fixes are the grout choice (epoxy doesn't feed mold), the ventilation (fan during and 20–30 minutes after showers), and the reseal cycle on cement grout.
+Do I need epoxy grout, or is sealed cement grout fine?
In a Florida shower, epoxy is the stronger choice: it's non-porous, needs no sealing, and resists the staining and mildew that humidity feeds. Sealed cement grout works but demands maintenance — penetrating sealer after curing, reapplied every 6 to 12 months, and pH-neutral cleaners only. The trade-off for epoxy is installation: it cures fast and needs skilled, careful cleanup. Choose based on how much maintenance you'll actually do.
+What goes behind the tile in a shower, and why does it matter?
A bonded waterproofing membrane meeting ANSI A118.10 — liquid-applied or sheet — over cement backer board, with a sloped, flood-tested pan at the base. Tile and grout are the wearing surface, not the waterproofing; water passes through grout, and without the membrane it reaches drywall and framing. Most shower failures are membrane failures, discovered years after the tile looked perfect. That's why the flood test before tile matters more than the tile itself.
+Can I use large-format tile on my shower floor?
Yes, with two conditions. First, the pan still needs its slope to the drain — large tiles can't follow a tight compound slope, so the pan is often built with an envelope cut or a linear drain. Second, the tile needs a wet DCOF of 0.42 or greater under ANSI A326.3, because a shower floor is always a wet surface. Small mosaics naturally grip better through grout joints; with large format, the tile's own texture has to do the work.
+What slip rating should my bathroom floor tile have?
For a level interior floor expected to be wet, look for a wet DCOF of 0.42 or greater under ANSI A326.3 — that's the industry's Interior Wet classification. It's a test value, not a guarantee: soap film, wear, and cleaning all affect real traction. Polished tile on a bathroom floor is only acceptable if the manufacturer declares that exact tile suitable for wet floors. When in doubt, choose texture over shine.
+How do I know the waterproofing was done right before tile covers it?
Ask for the flood test and watch it happen: the shower pan filled with water to at least 2 inches at the threshold, held with no leakage — Florida's plumbing code requires the test, and a careful installer holds it longer than the minimum. Also ask what membrane was used and whether it meets ANSI A118.10, and check that backer board (not drywall) is behind the wet-area tile. If a contractor resists the flood test, that's your answer.
+The floor feels soft near the tub — is that a tile problem?
It's a what's-under-the-tile problem. A soft or spongy feel means moisture has reached the subfloor and the plywood is rotting — the tile was just the last thing to show it. Stop using that shower, keep the area dry, and get the substrate opened and assessed. The tile decision comes after the carpentry: no new tile goes over a compromised subfloor, and any proposal that skips the subfloor assessment is incomplete.
+How long does a bathroom tile job take, and can we use the bathroom during it?
A shower retile typically runs the better part of a week: demo and assessment, substrate and waterproofing with the flood test, tile setting, grout and cure, then caulk and sealer. Cure times are fixed by chemistry — mortar 24 to 48 hours before grout, cement grout 72 hours before sealing and use — and can't be rushed. Plan on the bathroom being fully out of service; a "quick shower" mid-cure ruins the grout.
