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Unread 03-12-2014, 10:19 PM   #886
PC7060
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Curb and kerdi layer on mud base installed!

Both went in smoothly and was able to get the banding and corners installed with minimal build up. Need to install the outer corners on the curb top tomorrow and I'll be ready for the water test.

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The blocking in front of the curb was installed to keep it all aligned in place until the thinset and kerdi band sets up
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Unread 03-13-2014, 06:24 AM   #887
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Nice work. Wasn't there plans for a radius bench or has that been scrapped?
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Unread 03-13-2014, 10:59 AM   #888
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Bench is still in the plans, Pete. I'm installing it next inside the water proof envelope.

Pulled the temp blocking and both the curb and Kerdi on shower floor looked great this am. I did clean up some of the thinset right around the drain and sealed the kerdi nice and tight with the kfix.

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Finally making progress!
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Unread 03-13-2014, 01:36 PM   #889
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Hi PC.
Since I am (I was?) a chemist I am always interested in the quantities when mixing materials. Drives me nuts when people talk about mixing "parts". What the Heaven is a part? lol. I prefer grams and mL!
Anyway..... my question is.... what amount of water did you use per 50 lb. bucket of sand and ceememt mixture when making the mud? Just curious.
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Unread 03-13-2014, 03:54 PM   #890
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Hi Jim,

The "out of the bag" sand and sand mix I used was very dry, I estimate it took around 2 quarts of water per 50lb bucket of the cement/sand mix. I found it easier to mix a pint into the full container to get the dust down and then split it into two portions (25 lbs approximate) for the final mixing.

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Unread 03-13-2014, 04:43 PM   #891
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Found a 1 1/2" bubble under the kerdi on the shower floor.

1. To correct, can I cut a slit, fill with kfix and then apply a 5" patch over the slit with kfix?

2. I presume I could also use thinset for the repair, is that preferred over the kfix?
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Unread 03-13-2014, 04:52 PM   #892
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PC, if you use thinset mortar to adhere a patch it must extend at least two inches from any part of your cut. If you use Kerdi Fix to adhere the patch, your 5" patch would cover a 1 1/2" slit quite nicely and would be my preference.

My opinion; worth price charged.
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Unread 03-13-2014, 04:56 PM   #893
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Thx CX, I prefer the kerdi fix method myself. Also works great when setting kerdi corners where the tight area of the shower curb prevent a full 2" overlap.
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Unread 03-13-2014, 05:00 PM   #894
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Is good pookey.
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Unread 03-13-2014, 05:17 PM   #895
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PC, tell more about kerdi fix in the corners? So unmodified thinset sticks good to kerdi fix? I am about to do my first Kerdi extravaganza.
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Unread 03-13-2014, 08:24 PM   #896
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No problem, Chuck. I'll take a couple pics in the am which show the corners.

Thinset sticks just fine to either Kerdi fix (can by online) or SikaFlex (can buy at homers). Both are polyurethane based sealants which provide exceptional water proofing protection. I use the sealant under any loose edges of the Kerdi and also on the Kerdi board to seal any penetrations; described this process a few pages back (here) too.

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Unread 03-13-2014, 11:05 PM   #897
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Kerdi Fix is not a polyurethane product, PC. It's Silane based. Not sure the SikaFlex is, either, but I'd hafta go read the only tube I've ever had of the stuff.
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Unread 03-14-2014, 07:05 AM   #898
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CX, you are correct, the KFix and Sikaflex-AT products are both silane based and Sikaflex 1C is polyeurethane.

Per the data sheet, Silane-terminated polymers (STP) combine the properties of polyurethanes and silicones for "applications where less surface pretreatment and isocyanate free products are requested"

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Unread 03-14-2014, 04:11 PM   #899
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Ok thanks PC. lookin forward to the pics. I got started and got my mud bed done.
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Unread 03-14-2014, 05:26 PM   #900
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Chuck, these pics show two sets of kerdi corners installed in my shower floor. The first picture shows a corner installed using the standard method with thinset and required a minimum of two inches overlap for a seal. I took this picture during the start of the 24 hr water tight test and you can see the thinset has darkened where exposed to the water.

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The second picture shows inner and outer kerdi corners installed at the shower curb. These corners only overlap 1 1/4" due the height of the of the curb so I used the Sikaflex (generic kfix) to attach and seal the corners. The sealant is white and does not darken when covered with water.

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