We are in the process of planning a bathroom remodel. The shower has 1/2" supply lines that are located on an outside wall. There is no way to use an inside wall. We want to make the shower into a custom shower with body sprays, rainfall head, hand held spray, and maybe a ceiling spray. With all of the additional flow requirements, 3/4" supply lines would be better, if not necessary for proper performance.

The outside walls are concrete block. Will cutting into the block weaken the walls significantly? How much can be cut away?

I live in South Florida, so freezing pipes is not a concern.

Thanks for any help.

I do not really see a problem cutting in to the wall if you are only cutting the inside face and you are only disturbing 1 block width... BUT why do that?

You can always build a false wall out in front of the shower... say an 1.5 inch wall, then cut hole in concrete block to accommodate the depth of the shower valve but pipes are inside the false wall and you do not have to cut block wall up entire length of wall.

Let me know your thoughts on this! If my answer was helpful please rate my answer!