Flagstone patio base question


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Old 08-30-06, 09:31 AM
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Flagstone patio base question

I posted this in landscaping because I missed this forum. It might be more appropriate here...

I've got my hole dug, my arbor built and the form set on the edges with 2x6s.

Yesterday, when I went to the yard to order my stone, gravel and sand, the lady tells me to not worry about the sand and just use the crushed, compressed gravel. She says something about sand being round and rolling while crushed gravel maintains its crystalline structure so won't move around as much resulting in less problems with the stones moving.

Anyway, I've been reading around a ton this morning and I can't find anyone who sets straight into gravel. Lots of people who do gravel then sand and even more that just do sand.

In addition, I dug my hole a bit too deep. It's about 7-10" deep (I was a little gung ho, I guess). I'm going to backfill a good deal of that with dirt so that the dirt is at least level with the bottom of my staked 2x6s.

Now, I've ordered about a 1.5 tons of the gravel which is going to give me about 3". My stones are 2" so that leaves me another 1" or so. Here are my options:

Backfill with more dirt and just use the gravel ordered.

Order more gravel and set in gravel

Get some sand. This has three sub-choices then. Do I just sent in 1" of sand on top of the gravel or is that not enough? Do I not backfill with as much dirt and leave room for more inches of sand inside the form? Do I reduce the gravel to 2" coverage and do 2" of sand?

Any feedback from those who might know a thing or two about a thing or two will be appreciated.
 
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Old 08-30-06, 10:11 AM
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As a rule, you would not want to put dirt back in the hole. The general specification is "undisturbed soil". Unless you plan on renting a compactor, I would order more gravel. The prime use of the sand is as a leveling bed. If you feel comfortable with your ability to level the gravel, there is no particular need for the sand.
 
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Old 08-30-06, 12:11 PM
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I was planning on watering and then screeding the gravel off the forms I built. Will that be sufficient? I've read that the stones won't bed as well straight into the gravel. Is that false?
 

Last edited by DIYaddict; 08-30-06 at 12:39 PM. Reason: Removed quote as it's unnecessary to quote the entire post directly above yours
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Old 08-30-06, 04:17 PM
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You wil lneed compaction on the gravel as well. Add the gravel to the hole in 3" lifts and use a hand tamper at a minimum. After you screed it off level with the forms (why are you using forms, anyway? Shouldn't the patio be level with the ground?), then compact with the tamper and add sand to bring it back up. Screed THAT and then apply the stones.
 
 

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