I’m in the process of building a fireplace in central Jersey, and am above the roof. It looks like I’ll be running into freezing weather at night pretty soon. I’m concerned about the concrete freezing before it sets. Any thoughts, ideas, experience about what my problems are, how long I need to keep the work above freezing (I can set a propane heater in the fireplace and send heat up the chimney, while wrapping the work at night)? Don’t want to find the work all crumbled in a year or two. Thanks.
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Just go to your local supply house and get some antifreeze specifically for mortar.
You can get it in either liquid or powder form and it will protect the mortar from freezing down to about 26 or so and from causing damage to it if it does freeze.
Standard practice for winter work. Also helps it to set a little quicker(not much but a little)