Bathroom Tile & Vanity Installation
Tile fails at the substrate and vanities fail at the box. Both problems are decided before installation day, and both get tested hard by soil that moves and air that stays damp.
- Houston metro
- Written scope before work begins
- Licensed trade subs where required
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Overview
Bathroom Tile & Vanity Installation
Tile is a rigid, brittle finish laid over something that moves. Across this region the movement has a specific cause: expansive clay soils that swell after rain and shrink in drought, moving slabs and framing enough to show up as sticking doors and cracked drywall. A tile floor telegraphs the same movement as a crack running the length of a grout line. The defense is not stronger mortar. It’s a proper joint plan.
Flatness is the other half. Ceramic and porcelain want a floor that deflects no more than L/360; natural stone wants L/720. Large-format tile — anything with a side of 15 inches or more — wants the substrate flat within about an eighth of an inch over ten feet, because a big rigid tile can’t follow a hump and you get lippage at every edge. Grinding, patching or self-leveling first is normal work, not an upsell.
Vanities have a simpler failure mode: water and humidity get into the box. Particleboard sides swell at the toe kick, painted MDF doors blister along the bottom rail, and the back panel behind the sink is where a slow supply drip does its damage. Materials, the exhaust fan, and whether the cabinet touches the floor at all are what decide how many years it lasts.
The things that actually decide this job
Substrate first, always
In wet areas tile goes over cement board, waterproof foam board or an uncoupling membrane — never straight onto regular drywall, and green board is not waterproofing. Check the floor with a straightedge before setting: high spots get ground, low spots get patched. Aim for at least 80 percent mortar coverage on a dry-area floor and 95 percent in a wet one, with full support under every corner, which in practice means back-buttering large tile.
Movement joints are what matter on moving soil
Industry guidance calls for soft joints — silicone or a purpose-made profile, never grout — at the perimeter of every tiled floor, at inside corners, at changes of plane, and in the field on larger floors. In a region where slabs move seasonally, these are what let a floor breathe instead of crack. If a previous floor cracked in a straight line or tented at a doorway, look at the joint plan and the slab, not the setter’s thinset.
Grout: pick for the joint, not the color card
Polymer-modified cementitious grout is fine for most walls and floors and is easy to repair. Epoxy resists staining and chemicals and is the better call on a shower floor, but it sets fast, punishes sloppy work and is hard to clean off textured tile. Unsanded grout suits joints under an eighth of an inch and sanded goes above that. Wherever two planes meet, use matching silicone instead of grout so the joint can move.
What makes a vanity survive a bathroom
Look for a plywood box, a moisture-resistant back panel, and drawers on full-extension soft-close slides rather than doors hiding one shelf. Full-height drawers make a small vanity hold roughly twice as much. A floating vanity needs blocking in the wall and often a repositioned drain so the trap clears the drawers, and it pays you back by keeping the box off a floor that gets wet. Check the faucet hole spread against the sink before ordering either.
Practical considerations
Choosing tile for a bathroom floor
Porcelain absorbs half a percent of water or less and wears better than ceramic; for a wet floor, look for a dynamic coefficient of friction of at least 0.42. Natural stone is beautiful, needs sealing, tolerates no acidic cleaner and wants a stiffer floor beneath it. Wood-look plank tile is slightly warped along its length by design — keep the offset to a third or less, or every single joint will lip.
Humidity gets into cabinets
In a bathroom with a weak or short-running exhaust fan, moisture condenses on the coolest surfaces and finds cabinet edges. Painted MDF doors swell from the bottom rail up, laminate lifts at seams, and a toe kick wicks whatever hits the floor. Sizing the fan to the room, ducting it outside and running it on a timer protects the cabinetry as much as the drywall. In a heavily used bath, a wall-hung vanity removes the problem entirely.
Set the layout before the first cut
Decide where full tiles land and where cuts go: never a sliver at the doorway or a half-inch strip on the most visible wall. Plan the transition to hall flooring, the treatment at outside corners — a metal profile, a bullnose or a mitered edge each look completely different — and whether wall tile runs to the ceiling or stops on a line. Dry-lay a section and look at it in the room’s own light before mortar comes out.
What’s under the old floor
In homes built before roughly 1990, sheet vinyl, old floor tile and the black mastic under them can contain asbestos, which is harmless intact and a real problem the moment somebody grinds it. Have it tested before demolition rather than after. You may also find a mud-set bed several inches thick, which changes the finished floor height and how the toilet flange lands — both need solving before new tile is ordered.
At a glance
| Decision | Spec that matters | Where it shows up |
|---|---|---|
| Floor tile in a wet room | Porcelain, water absorption 0.5 percent or less, DCOF 0.42 or higher | Traction underfoot and staining around the toilet |
| Large-format tile | Substrate flat within 1/8 inch over 10 feet, offset one third or less | Lippage at every edge and hollow-sounding corners |
| Natural stone | Deflection no worse than L/720, white thinset, sealed, no acid cleaners | Etch marks, dark spotting and cracked pieces |
| Grout joints | Unsanded under 1/8 inch, sanded above; silicone at every corner | Shrinkage cracks and color differences in the corners |
| Movement joints | Soft joints at the perimeter, inside corners and across wide floors | The straight crack that runs the length of the room |
| Vanity box | Plywood sides, moisture-resistant back, full-extension soft-close slides | Swollen toe kicks and doors that stop closing flush |
Common questions
Why does my grout keep cracking in the same line?
A straight crack running across a floor is almost never a mortar problem. It’s movement — a slab flexing on clay soil that swells and shrinks with the seasons, a floor deflecting more than tile can tolerate, or a tile field set with no soft joints so it has nowhere to go. The fix is diagnostic: check the floor for deflection and the slab for movement, then rebuild with proper perimeter and field movement joints. Re-grouting the same line only resets the clock on it.
Is epoxy grout worth the extra cost?
On a shower floor and in heavy-use areas, often yes: it resists staining and household chemicals and doesn’t need sealing. The trade-offs are that it sets quickly, punishes a slow or careless installer, and can be difficult to clean off textured or porous tile faces. It’s also less forgiving to repair later. A polymer-modified cementitious grout, installed well, performs fine on most walls and floors. Match the choice to the tile and the room instead of specifying it everywhere by default.
Is a floating vanity a good idea in this climate?
It has one real advantage: the cabinet never sits in water on the floor, which is where box failures usually start. It also makes a small room feel larger and is much easier to clean under. The requirements are solid blocking sized for the cabinet and its top, and often a repositioned drain so the trap clears the drawers — both decided at rough-in, not at install. Check the manufacturer’s load rating if you want a stone top, and set the height for the people using it.
Can new tile go over the existing floor tile?
Sometimes, and it’s often a poor trade. The existing tile has to be fully bonded — tap the entire floor and listen for hollow spots — and the added thickness must be resolved at the doorway transition, at the vanity toe kick, and at the toilet flange, which needs to end up at or just above the finished floor. Adding height and weight over a floor that already had a movement problem repeats the problem. When there’s doubt about what’s underneath, taking it up tells you the truth.
Quartz, granite or marble on the vanity top?
Quartz is engineered, non-porous, needs no sealing and comes in consistent patterns — the low-maintenance choice in a bathroom. Granite is natural and very hard, and wants periodic sealing depending on the stone. Marble is the one people fall for and then regret in a bathroom: it etches from anything acidic, and toothpaste, cleaners and skincare products all qualify, so a honed finish that hides etching is the usual compromise. Cultured marble and solid surface offer integrated bowls that remove the seam around the sink entirely.
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