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Unread 06-05-2010, 03:12 PM   #28
Veteran DIYer- Schluterville Graduate

STAR Senior Contributor

Join Date: Jul 2004
Location: Nashua, NH
Posts: 14,923
You don't 'need' a decoupling layer over a full-coverage slc, but it is an insurance policy. The key to a successful slc pour is good prep and being FAST. You want to flood the area before things start to set up, and this means getting help and preparation. The stuff (depending on the brand and version) is between water and pancake batter. It will level, but make need some help flowing into corners. It levels best when you get all surfaces wet with the stuff and it is thick enough, otherwise, you'll get high and low spots, if too shallow, since surface tension will hold it. once all surfaces are wetted with the stuff, and it is thick enough, it will level if you get the coverage before it starts to set up. Otherwise, it can be like a partially frozen puddle...the set (frozen) stuff will bend or crack and you may not get the liquid stuff to flow to relevel it. It's almost like a switch...liquid one minute, and hard the next (with a plastic period inbetween that doesn't last long). They make adjustable rakes to help move the stuff around and gauge level, but it may be overkill for one use. I used a snow rake, since it had a nice long handle, to move it around into the corners without stepping in the stuff. They do also make cleats, if you want to walk around in the stuff without getting your shoes all covered.
Jim DeBruycker
Not a pro, multiple Schluter Workshops (Schluterville and 2013 and 2014 at Schluter Headquarters), Mapei Training 2014, Laticrete Workshop 2014, Custom Building Products Workshop 2015, and Longtime Forum Participant.
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