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I had planned to find a nook in the low-humidity house in which to shove it, but it would be interesting to know how long the bag will keep in various humidities.

The main question is: How long can I store a (new, sealed) bag of Quikrete in the house with central AC and heat?

I don't expect there to be a perfect answer to this question, so I'll upvote any useful insight (ie "I kept a bag for X years and it was fine" or "I kept a bag for X years in the garage and it turned to a brick").

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Depends on how exactly you store it. If you want to keep it around as long as possible without becoming a brick, put it in a seal-able plastic tub with desiccant packs and keep it in your house (as you said you were).

Too much effort in my opinion. Just take it back to the store, get your money back, and repurchase a new bag in the future when needed.

I've had bad experiences with them turning into bricks in a high-humidity basement; took about 6 months for it to happen.

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Well, its $3 for the bag and the drive to the store to return it would cost at least the $3 in gas. I thought I may use it in the future, but have no current plans of how yet. – Randy Jun 28 '13 at 19:00
No need to make a special trip. Just make it part of your daily trip to Lowe's :) – Ghost Jun 28 '13 at 19:17
I would, but the problem is I bought it at Ace :p – Randy Jun 29 '13 at 0:50

I live in the Pacific Northwest. A bag in my garage turned into a brick after just one summer to winter to summer transition.

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Sounds about right in the land of rain where people rust instead of tan. It starts clumping towards midwinter. I actually salvaged it with a sledge hammer and screening as it was a low strength application. Lotta work for little return. Buy only what you need unless you have a really dry storage area. Amazingly, the Bentonite HoleShot didn't get affected by the humidity (4 winters now). That stuff swells to 20-30 times its size when it gets wet. – Fiasco Labs Jun 28 '13 at 5:58
So, even after it turns to brick, you can bust it up and use it for something like a post hole? – Randy Jun 28 '13 at 18:58
If it hasn't thoroughly set, yes. It doesn't necessarily evenly absorb moisture. You can have an outer shell that ends up being aggregate that can be fused together by the remaining Portland Cement that has been minimally hydrated. Not something you want in your foundation where strength is needed. Also wear a dust mask, you don't want cement lung. – Fiasco Labs Jun 29 '13 at 5:07

I had 4 bags stored in my garage, I thought I would be able to use it if it hadn't turned into a brick. It was hard but I opened a bag and it was still somewhat "powdery" so I mixed it up for setting a Mailbox Post. A day or so later the post was still not set. The little extra pieces were not hard and crumbly. So, I guess it does have a shelf life, even when not hardened.

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