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I want to put limestone blocks 2x2x5’ for seats in a 10x12, 4’ deep fireplace area, I rented a digger and dig a good amount and plan to put 6” of bass or minus then the blocks around the pit.. will it sink over time?

I need it to drain and stay put right?

NathanPolomona
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  • Hmm not sure how much depth you'd need here, but for strong bases for heavy stuff you lay gravel in 3" "lifts" and pack each lift with a packer before adding the next. A properly packed lift feels hard like you're standing on concrete. More lifts and more packing give more resistance to sinkage. I definitely wouldn't think about less than 2 3" lifts, but I'd consider more. Nature of the gravel provides drainage and can be connected to weeping tile if you wish. – K H May 04 '21 at 11:24
  • Well, yes, I presume you "need it to drain and stay put". Are you asking if you need _drainage_ in order for it to stay put? Please feel free to [edit] your post to clarify that bit. Also, are those blocks 2' x 2' x 5'? They're _mighty_ big and heavy. I'm no expert by any means, but I'd think that 6" of gravel may not be enough to support that - I'll let others with more experience chime in, though. – FreeMan May 04 '21 at 11:58
  • 6” is a lot of rock when compacted. I use 3/4- in my horse stalls and even our big boy ~1800 lbs doesn't have problems with 6” and a 1” rubber mat over that, your soil conditions could require more or not even need an inch it all depends on what is there. – Ed Beal May 04 '21 at 13:41

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