[wilnj]

As with everything else, it depends.

Cement does give off heat as it cures but it’s a function of mass and surface area.

When I pour a 300 or 400 yard footing that is on the ground, in a hole and it’s 4 or 6 feet thick, we can throw blankets on top, draped down to ground and it will be fine well below freezing.

If I do a 300-400 yard floor placement on metal deck, up on the building it’s only 3 to 6 inches thick, we have to enclose the floor where the work is taking place as well as the floor underneath and heat the floor underneath. I’ve been able to get 60 degree deck temperatures for those jobs even when the outside air temperature is at or below freezing.

In the OPs example, you have a ribbon of mortar, 3/8” thick and 3” wide surrounded by bricks that are 2-1/4” thick and 3-5/8” wide acting as a heat sink.


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