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Cutting Kerdi Shower Pan

 
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Old 05-21-2018, 05:41 AM   #1
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Cutting Kerdi Shower Pan


Anyone done it? I’m doing a 36”x70” shower so I ordered the 48”x72”. Schluter reccomends cutting all four sides evenly, if you can’t you can make up the difference in lower height at back wall and front curb (in my case) with thin set. Sounds hokey. Tips?

I’ve only done old school mud bed pans but these kerdi shower pans have gotten so cheap it seems to be the way to go, I think it was $135. A mud bed would be almost that much and I’d still need to buy a sheet of kerdi.
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Old 05-21-2018, 07:11 AM   #2
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Re: Cutting Kerdi Shower Pan


How offset will your drain be? I have to trim most of the pans I install a little. Will the height difference at the curb really be that noticeable? Generally it's just 1 row with the sill on top, and not really a focal point of the shower.

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Old 05-21-2018, 07:26 AM   #3
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Re: Cutting Kerdi Shower Pan


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Originally Posted by rblakes1 View Post
How offset will your drain be? I have to trim most of the pans I install a little. Will the height difference at the curb really be that noticeable? Generally it's just 1 row with the sill on top, and not really a focal point of the shower.

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Not the curb so much as the back wall.

Drain hole is centered on the kerdi pan

Not the place I bought it but this is the model.


https://www.warmyourfloor.com/kerdi-...y-48-x-72.html


Now I’m thinking if I buy the kerdi bench I could trim equal amount all around no problem.

Last edited by Big Johnson; 05-21-2018 at 07:31 AM.
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Old 05-21-2018, 08:41 AM   #4
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Re: Cutting Kerdi Shower Pan


Dry pack to fill the gap, not thin set. Cover with Kerdi. Other option is fit in a cut off piece(s) from the pan, again cover the seam with Kerdi.

I cut mine with a track saw.

Make the bench and curb out of 2” Kerdi board. Cover with Kerdi as needed.

Make sure you protect the pan while you are kneeling on it, cut up the box, double/triple layers for protection

Tom
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Old 05-21-2018, 11:03 AM   #5
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Re: Cutting Kerdi Shower Pan


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Originally Posted by tjbnwi View Post
Dry pack to fill the gap, not thin set. Cover with Kerdi. Other option is fit in a cut off piece(s) from the pan, again cover the seam with Kerdi.

I cut mine with a track saw.

Make the bench and curb out of 2” Kerdi board. Cover with Kerdi as needed.

Make sure you protect the pan while you are kneeling on it, cut up the box, double/triple layers for protection

Tom
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Old 05-21-2018, 11:09 AM   #6
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Re: Cutting Kerdi Shower Pan


Could also buy an offset drain? Then front to back setting would not be critical. Benches are nice to have though, and the shower is big enough for one.
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Old 05-21-2018, 07:25 PM   #7
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Re: Cutting Kerdi Shower Pan


Anyone use the new hollow benches? I just ordered one from my supplier, apparently the solid ones are getting phased out.
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Old 05-21-2018, 07:29 PM   #8
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Re: Cutting Kerdi Shower Pan


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Could also buy an offset drain? Then front to back setting would not be critical. Benches are nice to have though, and the shower is big enough for one.
Going to trim it to 35” x 59. That removes 6.5” off each side and 6.5 off each end. The bench will be 11.5 so shower will be 35”x70.5 with bench.
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Old 05-21-2018, 07:31 PM   #9
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Re: Cutting Kerdi Shower Pan


Quote:
Originally Posted by tjbnwi View Post
Dry pack to fill the gap, not thin set. Cover with Kerdi. Other option is fit in a cut off piece(s) from the pan, again cover the seam with Kerdi.

I cut mine with a track saw.

Make the bench and curb out of 2” Kerdi board. Cover with Kerdi as needed.

Make sure you protect the pan while you are kneeling on it, cut up the box, double/triple layers for protection

Tom

The new benches are pre made with the 2” board. I bought a 38” that I’ll cut down to 35”. It was $205 from a local tile supply house.
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Old 05-21-2018, 09:08 PM   #10
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Re: Cutting Kerdi Shower Pan


Everything Tom said except we use a razor knife and straight edge to cut the trays.
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Old 05-21-2018, 09:20 PM   #11
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Re: Cutting Kerdi Shower Pan


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we use a razor knife and straight edge to cut the trays.
Hacks...

Tom
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Old 05-21-2018, 11:18 PM   #12
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Re: Cutting Kerdi Shower Pan


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Originally Posted by Big Johnson View Post
Anyone use the new hollow benches? I just ordered one from my supplier, apparently the solid ones are getting phased out.
I didn't know they had changed them, mind posting a pic when you get it?

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Old 05-21-2018, 11:20 PM   #13
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Re: Cutting Kerdi Shower Pan


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Originally Posted by Xtrememtnbiker View Post
Everything Tom said except we use a razor knife and straight edge to cut the trays.
I used to free hand with a circular saw, then switched to the snap blade knife, now I use my track saw just because I have one

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Old 05-21-2018, 11:43 PM   #14
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Re: Cutting Kerdi Shower Pan


Quote:
Originally Posted by rblakes1 View Post
I didn't know they had changed them, mind posting a pic when you get it?

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I make mine out of 2” Kerdi board.

Tom
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Old 05-21-2018, 11:50 PM   #15
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Re: Cutting Kerdi Shower Pan


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Originally Posted by tjbnwi View Post
I make mine out of 2” Kerdi board.

Tom
Something new to try on the next one!

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Old 05-22-2018, 12:53 AM   #16
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Re: Cutting Kerdi Shower Pan


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Originally Posted by rblakes1 View Post
I didn't know they had changed them, mind posting a pic when you get it?

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Will do. I pick it up Thursday after work.
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Old 05-22-2018, 05:12 AM   #17
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Re: Cutting Kerdi Shower Pan


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Originally Posted by Big Johnson View Post
Going to trim it to 35” x 59. That removes 6.5” off each side and 6.5 off each end. The bench will be 11.5 so shower will be 35”x70.5 with bench.
Best practice is to install the entire shower first and then add the bench inside the shower like Tom did in #14. With that in mind your pan should be 70.5 or so.
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Old 05-22-2018, 06:26 AM   #18
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Re: Cutting Kerdi Shower Pan


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Best practice is to install the entire shower first and then add the bench inside the shower like Tom did in #14. With that in mind your pan should be 70.5 or so.


That’s not what the Schluter videos show.





I can’t tell one way or the other from Tom’s two photos.
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Old 05-22-2018, 06:41 AM   #19
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Re: Cutting Kerdi Shower Pan


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Best practice is to install the entire shower first and then add the bench inside the shower like Tom did in #14. With that in mind your pan should be 70.5 or so.
I've never heard of anyone installing the bench over the pan. That sounds like it would be a nightmare with the different pitches of the pan

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Old 05-22-2018, 06:53 AM   #20
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Re: Cutting Kerdi Shower Pan


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Best practice is to install the entire shower first and then add the bench inside the shower like Tom did in #14. With that in mind your pan should be 70.5 or so.
The pan butts into the bench on mine in #14. Had the same issue the other Johnson is having. Direction of lap does not matter once waterproofed correctly.

Tom

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