How do you get rid of black mold on
shower grout and caulk in the shower?
By: Handy
Andy
There are
folks out there that say that if they have mild cases of either type (surface,
not entrenched), they use Tilex and let it sit. They believe that it if it's
mild, you should be able to walk away, come back in about 30 minutes and it
should be gone. That is optically true.
If it's
caulk and it's entrenched, replace the caulk. There is a certain point where
it's deep in the stuff and no voodoo will get it out.
The real
problem is twofold - the grout may not be sealed properly and you may not have
adequate air ventilation. Grout Sealer
can be used when the grout is completely dry - you really should wait 5 days
after cleaning it. Preferably after you have been out of town, not using the
area. Get Aquamix Gold or equivalent and a cheap sponge paint applicator. Check
the air ventilation.
We always
like to recommend that if you take a shower, to turn your bathroom ventilation
on.
If your
grout keeps molding after it's been cleaned and sealed, the problem is probably
in the wall. Someone took too long to address the issue. It's one of the issues
with grout, as grout is a very porous joint, and unless you stay up on the
maintenance, some of them will fail, and moisture will be sucked into the sheet
rock or plaster, or even hardiboard. To get rid of the problem you will either
need to replace the sub wall and retile.
Now, what to
do about a shower that has not been maintained in the above manner since it was
new?
Use cleaners
that do not contain acids (this includes vinegar). Acids remove desirable
material. It is recommended to an alkaline cleaner to remove built-up soap scum
and mineral deposits. Use this cleaner only when heavy build-up is present. It should
not to be used as a daily cleaner. For routine maintenance use a pH neutral
cleaner. Both products are available at tile supply stores or at Lowes and Home
Depot.
You should
also seal the grout and tiles with a penetrating tile sealer both when the
shower is new and periodically through the years. Grout and ceramic wall tiles
are not waterproof and will absorb quantities of water as the shower is used.
Water is the element necessary for breeding mold and mildew.
There are
many brands of tile sealers, all of which fall into two general categories:
mineral based and latex or acrylic based. Use the latex based products. They
won’t stink up your house like the mineral based ones will. If you buy your
products (cleaners and sealers) at full line tile supply stores, you’ll have
the best chance of obtaining the very best products available. The people who
work at these businesses are much more knowledgeable about tile products than
people who work at the local home centers.
Sealers do
not last forever. I would certainly go for the product that will last the
longest. In the past, sealers were only good for a year at most. I like
Impregnator 511 from Miracle Sealants. Both are available at Home Depot.
Sealing a
shower is relatively easy. Make sure the shower is completely dry. Dry means, it
usually takes about five days for the moisture to evaporate from behind the
tiles. The five days applies to all showers built with lath and mortar whether
new or old. If your shower has only sheetrock behind the tile, the walls will usually
dry in two days (unless the sheetrock is saturated, in which case you have
problems that can’t be fixed with sealer). Shower floors can take weeks or
months to dry out after having been in use for a period of time. You might want
to forgo sealing the floor in that case. In new showers, the floor can be
sealed along with the walls, but never use an old fashioned sealer on a shower
floor. The floor needs to breathe.
If your
shower is tiled with large floor tiles which are dense to the point that they
won’t accept sealer, you should use a small piece of sponge to apply sealer to
the joints only. Wipe the edges of the tiles with a damp cloth. It is important
to understand that not all floor tiles are super dense. Some of tile will
accept the sealer. Do a little test. Dap sealer on a tile and notice whether the
tile absorbs any of it. It does, seal the tiles and grout. If no sealer is
absorbed by the tile, seal the joints only.
It is imperative
that you remove all sealer from tile surfaces before it has a chance to dry.
Some of the water-base sealers are not “strippable” after they’ve dried. Pay
attention.
Here is the
recap: Clean it, seal it, and wipe it down each time it’s used.
You trusted
handyman Handy Andy
Visit us at www.HandyPro.com
March 2012