I'm in the process of installing a Grohe Precision thermostatic concealed shower system with two outlets: one feeding a fixed shower head and the other feeding a hand shower hose.
Both outlets connect to female threaded wall elbows that are concealed within a stud wall. I'm trying to work out the correct positioning of these elbows before I close everything up and tile. I could for example add an extension to the elbow to increase how far it comes through the wwll.
My question is: should the face of the wall elbow be installed flush with the face of the tile backer board, or is it acceptable (and normal) for the elbow to sit behind the face of the tile board?
The reason I'm asking is that the threaded connections supplied with the shower are quite long, particularly the fixed shower arm. Once I account for the thickness of the tile backer board, tanking membrane, adhesive and tile, it seems that I would need to position the elbow behind the face of the board in order to make proper use of the available thread length. If I bring the elbow flush with the board, it looks like the threaded fitting may protrude too far.
The shower is a Grohe Precision Chrome wall-mounted thermostatic mixer shower with a fixed head and separate hand shower outlet. I've looked through the installation information but haven't found a clear dimension for the finished wall position relative to the wall elbows.
From a plumbing and waterproofing perspective (it's for a steam / shower cabin), is there a recommended position for the elbow, or is the important thing simply ensuring that there is sufficient thread engagement and that the trim/cover plates sit correctly against the finished tiled surface?
I'd be grateful for any advice from those who have installed this Grohe system or similar concealed shower setups before.
Both outlets connect to female threaded wall elbows that are concealed within a stud wall. I'm trying to work out the correct positioning of these elbows before I close everything up and tile. I could for example add an extension to the elbow to increase how far it comes through the wwll.
My question is: should the face of the wall elbow be installed flush with the face of the tile backer board, or is it acceptable (and normal) for the elbow to sit behind the face of the tile board?
The reason I'm asking is that the threaded connections supplied with the shower are quite long, particularly the fixed shower arm. Once I account for the thickness of the tile backer board, tanking membrane, adhesive and tile, it seems that I would need to position the elbow behind the face of the board in order to make proper use of the available thread length. If I bring the elbow flush with the board, it looks like the threaded fitting may protrude too far.
The shower is a Grohe Precision Chrome wall-mounted thermostatic mixer shower with a fixed head and separate hand shower outlet. I've looked through the installation information but haven't found a clear dimension for the finished wall position relative to the wall elbows.
From a plumbing and waterproofing perspective (it's for a steam / shower cabin), is there a recommended position for the elbow, or is the important thing simply ensuring that there is sufficient thread engagement and that the trim/cover plates sit correctly against the finished tiled surface?
I'd be grateful for any advice from those who have installed this Grohe system or similar concealed shower setups before.
