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Releated to: Building on top of 3/4'' plywood subfloor

(link for impatient: http://www.mrmoneymustache.com/2012/12/21/how-to-make-a-relatively-sweet-shower-cheap/)

I would like to know how high the shower pan curb should be. I have read somewhere that 2" is the minimum while a lot of examples (Lowes,HD, tile stores) have some about 6".

So, my question: is there a rule? If so how high?

Bonus points There must be some sort of calculation I can do for this:

  • amount of water coming out of standard shower
  • volume of shower pan
  • amount of water being drained

yields how long it would take to overflow the shower pan.

Any pointers on this?

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2 Answers 2

up vote 2 down vote accepted

I just made a "curbless" shower for a relative last year.

Basically two things that I had to abide by:

#1 - Your slope must be between 1/4 and 1/2 inch per foot.

#2 - Everything must be waterproofed up until 2 inches above drain.

That's it.

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Indeed, this corresponds to construction for wheelchair accessible showers I have recently seen in new construction. –  wallyk Aug 17 '13 at 6:42
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The shower pan curb must be a minimum of 2 inches above the top of the drain. This is common building code in the U.S. For example, if you have a 1/4 inch per foot slope, and the curb is 3 feet from the drain, the curb must raise 1 1/4 inch from the shower floor. Of course, this is for the finished shower. The curb will be higher before you put in the pan. The 6 inch figure you are finding is for the shower pan liner. The liner should go up the shower walls at least 6 inches.

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