If your surgeon were to amputate the wrong leg, would you go back
to have him do it right the next time?

If it were my shower, and the grout was degrading, I'd use a grout
removal tool, and then replace the grout with sanded grout that had an
appropriate amount of acrylic additive so that it wouldn't be so
moisture permeable. And then I'd seal it after two days. And if
the shower was going to be used while the removal/replacement
process was going on, I'd hang a plastic film to keep the repair area
from getting wet. And don't rinse the grout down the drains unless
you're ready to clean them out afterwards.
And in the process, I'd be commenting on how dismal a product
grout is for stopping water migration, and how my way of doing tile
work is so much better. But that's a different story.

On Feb 5, 9:10 pm, TheWanderer wrote:
We've just bought a new house about five months ago and I'm having
problems with the master bath shower grout.

All along the edges inside the shower the grout is starting to turn
darker and it has cracks in it. It's fairly obvious to me that water is
getting into the cracks and causing the grout to erode.

The problem is that the builder says this is fairly normal and not to
worry about it!!!!!!!!! Should I or should I not demand that he
re-grout around the base of the shower enclosure??

Thanks for the help.