Replies

1. 
   Jer | Oct 17, 2007 01:30pm | #1

   I always played it safe and did a 3 to 1. That's the classic mix. I'm sure you're fine with a little more sand though

1. 
   Yersmay | Oct 17, 2007 05:35pm | #2

   Check out the forum at http://www.JohnBridge.com. Do a search and you will find a ton of information over there about dry pack.

2. 
   MikeHennessy | Oct 17, 2007 05:48pm | #3

   "I suppose I will have to rub/grind down some loose surface to get to hard surface before I place Kerdi.  Thoughts?"

   Nah. You'll be fine. The thinset stabilizes any surface "looseness". Also, I have found that you want the thinset under Kerdi to be a bit wetter than I normally use so it sticks to the Kerdi better.

   Mike Hennessy
   Pittsburgh, PA

3. 
   hammer1 | Oct 17, 2007 06:40pm | #4

   The mix is by volume. The materials don't weigh the same. Four shovels of sand to one shovel of cement.

   Beat it to fit / Paint it to match

1. 
   Jim_Allen | Oct 17, 2007 08:48pm | #5

   Thats what I was thinking. I was too lazy to go to a weight chart to see how the numbers worked out.fka (formerly known as) blue

1. 
   hammer1 | Oct 17, 2007 10:24pm | #6

   There can be a big difference in weight between a shovel full of wet sand compared to dry. Don't ask a mason tender any questions when he's shoveling, he might lose count. He probably doesn't have a scale, either. :-)Beat it to fit / Paint it to match

2. 
   sapwood | Oct 17, 2007 11:57pm | #7

   You did about a 3:1 mix by volume. Sand weighs about 120#/cubic foot and a sack of cement is one cubic foot. John Bridge recommends anywhere from 3:1 to 5:1. Your mix is stronger than most.

4. 
   Piffin | Oct 18, 2007 12:39am | #8

   mixes are specified by dry weight, but the problem is that in real life, you never see dry aggregate, so everyone does it by volumn.

   Yopu are fine with what you have if you packed it in hard.

    

    

   Welcome to the
   Taunton University of Knowledge FHB Campus at Breaktime.
    where ...
   Excellence is its own reward!

5. 
   JeffBuck | Oct 18, 2007 03:14am | #9

   sandy is gooder ...

   U don't want a smooth / shiney surface.

    

   sounds like ya done good.

   put it in dry ... dry enough to make mud "snow balls" outta ... so it doesn't stick to yer hands ... then pound the snot outta it till that little bit of moisture creeps up to the top.

   Jeff

       Buck Construction

    Artistry In Carpentry

        Pittsburgh Pa

6. 
   Charles100 | Oct 18, 2007 08:44am | #10

   Would be curious to hear about how your shower project goes. I'm considering using Kerdi when I rebuild a shower (part of a bathroom project I'm in the midst of). I've read much of the stuff put out by Schutler and the JohnBridge forum regarding the shower pan but still can't get my head around how those lapped joints can end up being water tight.  Seems like overtime the joints would let water to work it's way through.

   Anyone know how long Kerdi has been used for shower pans and if there have been problems? If so, I've not come across any word of such. Am curious though.

7. 
   Billy | Oct 19, 2007 03:54am | #11

   You done good.  The sandy surface makes it easy to scrape down any imperfections, and the loose thinset on top will consolidate things just fine.

   The mud bed is very strong in compression.

   Billy