Bathroom caulking and sealing in Southeast Michigan

Bathroom caulking is the least interesting job in the house and the one with the worst consequences when it is skipped. Every joint where two different materials meet in a wet room moves, and the bead in that joint is the only thing keeping water out of the wall. When it splits, darkens or pulls away, water goes behind the tile and stays there. Our bathroom repair crew cuts out every joint in the room, cleans back to bare substrate and runs fresh material in a single visit.

Why caulk and grout are not the same thing

Grout is rigid and fills the joints between tiles that all move together. Caulk is flexible and fills the joints between things that move independently: tile to tub, tile to floor, wall to wall in a corner, countertop to backsplash. Putting grout in a moving joint guarantees a crack within a season. Putting caulk between tiles looks wrong and traps dirt.

A tub full of water sits several hundred pounds lower than an empty one, and the joint at its rim opens and closes every time somebody bathes. That joint is caulk, permanently, and anybody who has grouted it will be looking at a crack by spring.

The black stuff, and what it actually is

Caulk that has gone dark grey or black is colonized. The growth is in the material rather than on it, which is why scrubbing lightens it for a day and then it returns. Bleach reaches the surface and not the body of the bead. There is no cleaning product that reverses this, and the products sold to promise it mostly bleach the surface film.

The fix is removal. We cut the old bead out completely, scrape the joint, clean the substrate and let it dry before anything new goes in. Caulking over old caulk is the single most common mistake in this job and it fails within months, because the new material bonds to the old bead rather than to the tile, and the old bead is already letting go.

Silicone, latex, and which joint gets which

One hundred percent silicone is the right material for anything that gets wet directly: the tub rim, the shower pan, the base of the shower walls. It stays flexible for years and it sheds water. It also cannot be painted, and it needs a clean dry surface to bond to.

Siliconized acrylic latex takes paint and tools more easily, which makes it right for the joints that stay dry: baseboard to wall, trim to door casing, the top of a backsplash. Using latex on a tub joint is a repair that lasts a year. Using silicone on trim you intend to paint is a repair you cannot paint.

The bead itself, and why the shape matters

A caulk joint works by stretching, and it can only stretch if it is bonded on two sides rather than three. A bead squeezed into a deep gap grabs the back of the joint as well as both faces, and then it tears the first time the tub moves. In a deep joint we set backer rod first, so the material bonds to the two faces and nothing else.

The finished bead should be slightly concave and no wider than it needs to be. A fat bead smeared over a wide gap looks like a repair and behaves like one. Neat work here is not vanity, because a joint tooled properly sheds water instead of holding a line of it along the top edge.

The toilet base, and the joint people argue about

Sealing around a toilet base comes up on every one of these visits. Michigan plumbing code generally calls for the fixture to be sealed to the floor, and there is a sound argument for it in a bathroom where the floor gets mopped or where small children are involved. The argument against it is that a sealed base hides a wax ring failure until the subfloor is gone.

Our practice is to seal the front and sides and leave a gap at the back, so a leak has somewhere to appear where you will see it. If the fixture is rocking, sealing it changes nothing about the underlying problem and the flange needs looking at first.

Every joint we run in one visit

• Tub or shower pan to the surround, and the vertical corners of the surround
• Tile to floor at the base of the walls, and the toilet base where code allows
• Vanity top to backsplash, and backsplash to wall
• Sink rim to countertop, and the escutcheons where valves pass through tile
• Baseboard and door casing joints in the same room, in a paintable material

What we find behind a failed bead

Sometimes the joint is the whole story and the repair is exactly what it looks like. Sometimes we cut the bead out and find soft drywall behind it, or a gap wide enough that water has been running down the face of the framing for a long time. A joint wider than about a quarter inch cannot be filled with caulk alone and holding it together with a fat bead is cosmetic rather than structural.

We say what we find. Soft substrate means the wall behind the surround needs opening, and that is a surround replacement or, where the tile and the pan are involved, a tile shower rebuild. Recaulking over a wet wall is a way of hiding a problem for a season.

Cracked grout usually rides along with it

A room that needs recaulking is usually the same age as its grout, and cracked or missing grout lets water in exactly the way a failed bead does. We scope the two together where it makes sense, and regrouting and tile repair is often the other half of the same visit. Doing one and leaving the other is half a repair.

Curing time, and staying out of the shower

Silicone needs time to cure before it gets wet, and the time depends on humidity and on how thick the bead is. We will tell you when the shower can be used again, and it is longer than most people expect. Using it too early is how a fresh bead fails in the first week. In a one bathroom house that is worth planning around, and it is the main reason we schedule this work for a morning rather than an evening.

The fan is half the problem

Caulk in a room that never dries out fails faster, whatever material it is. If the mirror stays fogged twenty minutes after a shower, the room is holding moisture and every surface in it is paying for that. A fan sized for the room and vented outside rather than into the attic changes the conditions the bead lives in. That is an exhaust fan question and it is worth answering at the same time.

Where recaulking earns its keep fastest

• Before a listing, where a black joint reads as a leak nobody disclosed
• Between tenants, when the bathroom is empty and the room can cure
• On a house you have just bought, where the joints have no known history
• On an annual walk through, before a split bead becomes a wet wall
• Alongside a remodel, where the whole room is coming apart anyway

Where we work across Southeast Michigan

Caulking calls run from our Ypsilanti shop across Washtenaw, Wayne, Oakland, Macomb, Livingston and Monroe counties. Ann Arbor and Plymouth come up most often, usually in bathrooms that were tiled well and sealed once.

Get the joints resealed

Tell us how many bathrooms and whether anything behind the tile feels soft. View our Portfolio to see the tile work our crews do, or contact us now for a free quote.