Sanded or unsanded caulk

I have not found any information about which caulk is better, sanded or unsanded for filling the joints of vertical walls in shower surrounds. In our shower, the contractor apparently used grout and now when the weather has turned cooler, the joints have small cracks. What kind of caulk I need to use to fill these cracks. Any information will be greatly appreciated. Thanks I'm not sure that the smooth versus sanded makes any difference in how it will hold up, it's mostly a 'look' difference. It might be easier to force regular latex caulk into the cracks if you don't intend to remove the grout. I'm not a tile guy but I think the corners are usually caulked. Some of the tile guys should be along later. If the joist is 1/8 or bigger, use sanded color matching, or just color matching silicone. This forum requires that you wait 180 seconds between posts. Please try again in 2 seconds. What hot said. But joints between dissimilar materials, and adjoining walls will not support grout for long, too much movement. Colored grouts are easily available, in unsanded or sanded. Use sanded for larger than 1/8 gaps. The sand is a binder. Thank you guys for the information. I forgot to mention that the joints I was talking about are the corner joints between two tiled walls. I do not want to remove the existing grout and fill the cracks using caulk. From your responses, I understand that I can use either sanded or unsanded caulk. They make sanded and non sanded caulk to match the texture of sanded and non sanded grout. What kind of grout do you have, sanded or non sanded? As has been pointed out to you, those joints should not have been grouted. Best bet is to remove the grout and replace it with caulk that is color matched to the grout. Thank you for the advice. I will remove the grout from the joint and use a smooth caulk to fill the joint. Appreciate all the advice.

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