Flooring Tile - Grout taking two weeks to dry?

I installed fresh grout after removing old grout in a shower 10 days ago. The grout is still dark (as when wet) in 75% of the installation. Is this normal? I've been running a fan to speed the drying time, but it is not helping. I'd like to seal the grout, but am not sure if this will further delay the drying process.

Any advice??

Do not seal it until you are sure it is completely dry.

What kind and brand of grout did you use?

Is grout that won't dry on wall tile or floor tile?

The grout is Polyblend Sanded Tile Grout - Antique White. The grout covers all joints on the floor of the shower and about 6-10 inches up the three walls. Grout turned white on the wall application pretty quickly, but is still dark on the floor. Running a fan and using a blow dryer don't appear to be helping.

One theory offered by the home improvement store was that the shower pan is creating moisture under the floor, extending the drying time.

I'd have to agree that the shower pan is likely holding moisture in the concrete setting bed. Unfortunately, this indicates that the shower pan was likely not properly constructed. A properly construct shower floor will have a mud bed UNDER the pan liner which slopes toward the drain, and a drain that has weep holes that would allow any moisture that collects on the top of the pan liner to drain out. Two common problems with tile shower floors are no weep holes in the drain, and no slope under the pan liner.

Did you have a problem with mildew in the shower floor grout?

We did have to clean the shower frequently, but it's hard to say if it was a problem or not. The house is 17 years old, so we assumed it was normal maintenance.

If it is a bad 'pan,' should I go ahead and seal the grout and let it cure at its own pace?

Do not seal grout until you are sure it is completely dry. I hope you have another bathroom for showering, as adding moisture to the problem will delay curing.

it could very well be hydrostatic pressiure from below trying to push it's way out.10 days is more than eneough time for grout to cure in any situation,the problem is getting the grout to dry from underneath, youy may not be able to get that to dry,let us know how you make out on this:cool: