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Unread 10-23-2020, 02:15 PM   #3
Veteran DIYer- Schluterville Graduate

STAR Senior Contributor

Join Date: Jul 2004
Location: Nashua, NH
Posts: 14,381
I don't see keeping it warm unless you wanted to go to the expense of a big tent and a heater. Curing cement is a chemical reaction that doesn't do well when it's cold. It's what is referred to as an exothermic reaction..IOW, it generates heat when it cures, but when it's cold out, there may not be enough energy in that chemical process to let it happen very fast, and under some circumstances, could almost stop it entirely.

Pouring a slab may work because you have a much larger, deeper mass of material that can contain some of that heat, but with thinset, almost instantly, it would cool off to the base temperature. Conversely, if it's super hot out, it can start to set much faster.
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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