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Laying block with temps in 40s

Old 01-08-2021, 11:49 AM
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Default Laying block with temps in 40s

Iíve been working on a project at the house and the highs this weekend are around 45 each day. At night it will be in the upper 20s. Iíve read that if the mortar mix has moisture in it it could freeze and cause problems with joint expansion. Iíve thought about covering the deck and placing a heat source under the covering in order to keep the block warm or at least above 40. Itís a 12x13 deck. I should be 9 courses high by the end of tomorrow. Iím asking any block layers or contractors do they see an issue and do I need the heat source at night. This photo is where I stopped at last weekend.
Old 01-08-2021, 12:08 PM
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I really am sorry to tell you this - but that wall is gona crack --the blocks look like they have to much water in them and your mortor joints are to small

also you need to point the joints to seal them
Old 01-08-2021, 12:19 PM
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Originally Posted by Dead Horse View Post
I really am sorry to tell you this - but that wall is gona crack --the blocks look like they have to much water in them and your mortor joints are to small

also you need to point the joints to seal them
the photo was taken last weekend when temps were mid 50s and 45 at night. I just washed them with a sponge and hour before the picture.
the joints are 3/8 to just less than 1/2 inch. Everything was dried by the next afternoon.
weíve got colder weather coming in this evening and I wanted to lay this weekend. This is why I was asking
Old 01-08-2021, 12:27 PM
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There are admixtures you can add to mortar that allows you to work down to about 25 degrees or so. Local commercial supplier should have it. Also cover block at night to keep water out.
Old 01-08-2021, 12:31 PM
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ah ok thanks --
Old 01-08-2021, 12:34 PM
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You should not have any problems if you follow cold weather masonry construction procedures. Just google it.
Old 01-08-2021, 02:11 PM
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Anti freeze admixture made specifically for mortar wouldn't hurt. If there is a place you can rent insulated concrete blankets to throw over the wall, it wouldn't hurt. Otherwise, I'd just place an electric milkhouse heater in their and throw some visqueen over it. maybe some 2x4's to support the visqueen.

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