Grohflex max and min limits

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Jechow

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Hello. I've purchased a Grohflex rough-in for my new shower. On the rough-in there are max and minimum limits. On the sticker there are arrows. Is the manufacturer indicating that the finished tiled wall shouldn't go past the arrow labelled maximum? I am asking because the tolerances seem a little tight since the max. arrow is 4" from the backside of the unit. Here is my rough calculation. If the rough-in is installed into a 2x4 wall the stud itself is 3.5" then you add in the 1/2" drywall plus 3/8 for tile. This means you can only have 1/8" of thinset to be within tolerance. Thanks.
 

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Jadnashua

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If you want the trim to fit...yes.

On another point, unless you are using either Kerdi or Hydroban sheet membrane, drywall has no place in a shower!
 

Jechow

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Thanks Jim. I was just concerned how accurate can Grohe be with just a sticker indicating max and mins. I guess this means that I should install the rough-in only partly recessed into the wall instead of against a board attached to the backside of the 2x4.

Yes, I will be using Kerdi so surprisingly drywall is the recommended backerboard.

Cheers.
 

DougB

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Install the rough-in so it will at least slightly protrude past the cement board and the tile. After the tile is set, you then trim off the excess ( I used a shop knife ) - flush with the tile..
 

Brianthedog

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Hello. I've purchased a Grohflex rough-in for my new shower. On the rough-in there are max and minimum limits. On the sticker there are arrows. Is the manufacturer indicating that the finished tiled wall shouldn't go past the arrow labelled maximum? I am asking because the tolerances seem a little tight since the max. arrow is 4" from the backside of the unit. Here is my rough calculation. If the rough-in is installed into a 2x4 wall the stud itself is 3.5" then you add in the 1/2" drywall plus 3/8 for tile. This means you can only have 1/8" of thinset to be within tolerance. Thanks.

How did your project turn out ? I ran into the same dilemma stressing over how the final valve assembly would fit or not.
 
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