Mortar only 2 days old, can I put weight on it?


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Old 11-21-21, 06:26 AM
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Mortar only 2 days old, can I put weight on it?

Removed a temporary LP tank from inside my garage to the outside, the company accidentally hit my block wall and broke the 2 top block off. Put 2 new block on just about 2 days ago, wrapped the block with insulation because the weather has only been in the mid 30's and 40's, need to put my front garage wall up before the temp drops lower and the snow comes next week. Seeing the top 2 block has only been up a little over 2 days would I be safe to put lumber weight on this wall, it's going to support my entrance door and my garage door opening. Should I put a torpedo heater near it and warm the block a little?
 
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Old 11-21-21, 06:28 AM
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I'm not an expert but I've seen foundations blocked up one day and the framing start the next day.
 
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Old 11-21-21, 06:32 AM
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Mortar typically will cure to 60% of its final compressive strength within the first 24 hours. It will then take about 28 daysto reach its final cure strength.

But the above is dependent on nominal temps!

You don't really need to add heat, when cement product cure they produce heat, but keeping it insulated helps.

Personally I would probably try and wait a week.
 
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Old 11-22-21, 04:42 AM
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Cold temperatures dramatically slows the curing. I would wait as long as possible but I would start working after it has had a week. I don't think the weight of lumber will be a problem but any shock loads concern me like bumping the wall or hammering if you are trying to get your new wall into position.

Do NOT apply a spot heater to the column. Uneven heating and dramatic temperature swings are the worst thing for curing concrete. Just give it a few extra days and it will get there on it's own.
 
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Old 11-28-21, 05:01 AM
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I waited about 5 days after this post and put up the front wall, everything looks fine. I still kept the insulation wrapped around the block with plastic around it in hopes the joints wouldn't freeze while I waited the extra days, temps are in the mid 30s during the day and mid 20s at night. Removed the insulation this morning and the blocks are still very damp seeing they were wrapped, should I just leave the insulation on for now or am I safe to remove it? My concern is if I leave the insulation off with the temps going down into the 20s again tonight will the damp wet block freeze or crack?
 
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Old 11-28-21, 05:32 AM
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Would it be a big deal to uncover them during the day and wrap them at night?
 
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Old 11-28-21, 07:54 AM
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I'll try that or maybe just leave the insulation on them all winter. Hopefully we get a few sunny warm days and I can let them dry a bit..
 
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Old 11-28-21, 07:56 AM
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It's been a week, nothing should still be wet at this point.
 
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Old 11-28-21, 09:42 AM
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The wrap likely holds moisture in.
 
 

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