Serious question, my shed slab cracked 11 days after pouring and I'm wondering if I did something wrong

Lily Schmidt · 2026-10-28T15:55:06.139876+00:00

I poured a 10x12 slab for my shed back on the 12th of last month, and by day 11 there was a crack running about 3 feet from the corner nearest the gate. I was out there with a level and a trowel, felt like I did everything by the book, mixed it wet enough to work but not soupy, and kept it covered with a tarp for 4 days while it set. My neighbor across the street, Dale, walked over and pointed at the crack and said the ground under it probably settled because I only dug down 4 inches and my yard is mostly old fill dirt from when they built the subdivision in the 70s. So I rented a small jackhammer from the tool rental on 5th, broke out the bad corner, dug down another 8 inches, and packed in 3 bags of crushed gravel before re-pouring that section with a bag of high strength mix. The patch has held for 3 weeks now with no new cracks, but I keep checking it every morning like a nervous dad. Has anyone else had a slab crack that fast, and did you find out it was the base or was it something else like too much water in the mix?

Rigidtalk

Loading…

Serious question, my shed slab cracked 11 days after pouring and I'm wondering if I did something wrong | Backyard Builds - Rigidtalk