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Old 03-05-2012, 02:11 AM   #1
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masonry work in low temps


is there a common low temp below which masonry work should be avoided, like 40 F ?

e.g. i just did some brick work and about 4 hr later the temps got below 40. is that bad?

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Old 03-05-2012, 04:51 AM   #2
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masonry work in low temps


Anything above freezing.

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Old 03-05-2012, 06:04 AM   #3
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masonry work in low temps


It can be done in cold temps, but it sure is a hassle. Additives, covering your work so it doesn't freeze, etc.
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Old 03-05-2012, 09:38 AM   #4
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masonry work in low temps


40F air temperature is no problem. Block basements here can be excavated and built at 0F.

A long as the mortar is not saturated when it freezes, there is no problem and your mortar did not freeze. Due to absorption of water by the brick and use of the water in the hydration of the cement, the mortar joints are not saturated after 6-12 hours of laying the brick. Any subsequent moisture and higher temperatures reactivates the curing of the mortar even if it has frozen.

Strength is also not a problem since weak mortar (compressive strength) is rare and the ASTM C270 specifications (Appendix 1) recommends to use the weakest mortar possible and still carry the load. Brick rarely carries any real load.

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Old 03-05-2012, 01:49 PM   #5
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masonry work in low temps


thanks everyone. how about painting masonry, can it be painted 12-24 hrs after laying or should i wait a few days to fully cure?

thanks
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Old 03-05-2012, 02:01 PM   #6
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masonry work in low temps


Wait.

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Old 03-05-2012, 02:06 PM   #7
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masonry work in low temps


Quote:
Originally Posted by concretemasonry View Post
Wait.
like how long?

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