pre-pan pitch [Archive] - Ceramic Tile Advice Forums - John Bridge Ceramic Tile


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02-27-2008, 09:35 PM
I am building a shower and where I am tilling the ceiling if I removed the sheet rock tons of insulation would fall and make a huge mess. Would it be ok to put backer right over the sheet rock? And could I not use 1/4 inch?

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02-27-2008, 09:37 PM
Hi JB,

Unless it's a steam shower, you could tile over the existing drywall on the ceiling. Just scuff up the paint to get a good bonding surface.

02-27-2008, 09:46 PM
And could I not use 1/4 inch?
This is always fun..... YES... :)

02-27-2008, 09:49 PM
Are you sure the sheet rock is old and funky from moisture. And there are a few holes here and there.

02-27-2008, 09:53 PM
if you think the sheet rock is bad and not better rip it down and install new drywall, cement board or Hardibacker and make sure you have a suitable , sound tiling surface.

02-27-2008, 09:54 PM
On my pre-pan I want it start about flush with my flange. Right? Is there a minimum for this?

02-27-2008, 09:59 PM
Hi JB, you want a minimum of 3/8" of mud at the flange for the preslope.

02-27-2008, 09:59 PM
It not horrible just a little funky. But how about walls? If there is sheetrock there Is it ok to put 1/4 over it. I realize this would make the tile stick out.

02-27-2008, 10:02 PM
HI JB, I merged your two threads together. We like to keep all the same questions for the same project on the same thread. If you would like the title changed let me know. :)

02-27-2008, 10:46 PM
I have read in a book I should glue the linar to the pre-pan. Is this true?

02-27-2008, 11:08 PM
No you don't have to glue the liner down. JB, Please keep the questions for the same project on the same thread. I will merge this one with your other one.

03-04-2008, 01:59 PM
Was wondering if 1/4 inch per foot pitch would be all right for pre-pan?

jim mclaughlin
03-04-2008, 02:04 PM
Correct. From the farthest point from the drain.

03-04-2008, 02:09 PM
Oh I see. I thought it was per foot from the drain. How about the actual pan though. It is more than that right? I like to use the quick-pitch system. Its like the shoulter drain.

jim mclaughlin
03-04-2008, 02:57 PM

Not knowing your level of experience...and not wanting to offend but go to the library and spend some time there. A lot of this is already covered there extensively and it will make better use of your time.

03-04-2008, 03:00 PM
here ya go.

03-04-2008, 10:35 PM
Well actually I have more experience than you might think. Just always trying to learn more. Sometimes better from people than books. (sometimes) I have done 10,000 dollar showers but thought I was putting more pitch on the pre-pan than necessary. Thanks anyways.

03-04-2008, 11:06 PM
Now I just read and what I thought the first time is what it said. 1/4 inch per foot on the pre-pan. Not from the farthest point. Although I like the idea of doing it that way. It seems as long as there is any pitch it would work.

03-04-2008, 11:13 PM
the pre pitch need to have a pitch to make the water absorbed in the mud pan able to run off, and the final mud needs to be pitch so the water will flow to the drain properly.

03-04-2008, 11:24 PM
Gotta go from your longest corner to the drain JB.

If ya got a 3x5 shower and you go 1/4"/ft from the closest wall then you aint got 1/4"/ft slope to the furthest wall. No joke,, 1/4"/ft is minimum for positive drainage on your preslope and your dry pack. :)

03-04-2008, 11:27 PM
Now I just read and what I thought the first time is what it said. 1/4 inch per foot on the pre-pan. Not from the farthest point.Mmmm, not sure where the disconnect is here, JB, but Jim's correct about measuring from the farthest point from the drain to calculate your slope. A quarter-inch per foot doesn't mean much unless you know how many feet you'll be dealing with, right?

My opinion; worth price charged.

03-05-2008, 10:45 AM
see I thought you started at your flange then every foot from there you added the 1/4 inch. You are saying make the longest distance which would be about 2 feet have a total of 1/4 pitch. Is that Right?

Dave Taylor
03-05-2008, 10:54 AM
Mebee' in two feet that would be a "total pitch" of 1/2".
1/4" + 1/4" = 1/2" total. :twitch:

Or mebee" it's just a tomato - tomahtoe thing. :sick:

03-05-2008, 10:59 AM
yes, I see we are doing the same just saying it different. Thanks

03-05-2008, 11:15 AM
I do my preslope at 3/8th of an inch, not a quarter. Final setting bed is a quarter. On standard size showers, this is fine. On larger sizes the final setting bed would get a bit thin at the edges, so the two slopes have to be the same.