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 Post subject: Laying slabs on sand
PostPosted: Fri Jan 19, 2018 9:34 am 
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Location: Le Périgord Vert (24)
Because the entrance to my garden is a fairly steep slope, over the years have had trouble getting a grip on the fairly loose broken rock surface, especially when towing a trailer.

Had a quote from a builder over a year ago to concrete, accepted it, aknowledged by him, haven't seen him since. X(

So, recently had a blinding idea, lay slabs outside and inside the gate area to give me grip over the worst bit.

Hired the mini-pelle, dug out a 6 sq.metre section and bought the slabs. I already have the sand and some cement to sprinkle in the cracks and am ready to start.

But, it was raining yesterday, is promised for today and a few more days yet, but I am anxious to start as driving through the cut out area is even worse than before.

At last. The question. Must the sand be dry before laying the slabs or does it matter if it is wet? Not talking about laying in the rain, but worried about getting caught out in a shower. Or should I wait till the end of next week when the sun is predicted to return?

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 Post subject: Re: Laying slabs on sand
PostPosted: Fri Jan 19, 2018 10:55 am 
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Location: somewhere in the "pays de dropt"
Been there done that.
You need hard core about 100 to 150mms, under the slabs to give a good foundation for heavy use, then the best is to use a lime/sand mix with the sand damp but not as in mortar.about 75mms
Screed off sections with a straight edge lay the slabs tamp down and when its set brush over with dry fine sand/cement to fill joints

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 Post subject: Re: Laying slabs on sand
PostPosted: Fri Jan 19, 2018 11:59 am 
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Thank you, it is mainly hard core there already, so just a matter of spreading the sand to the right depth.

I think I will wait till I get an almost guaranteed window in the weather long enough to get all 24 laid at the same time. That way it will be easier to get the gradient right.

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 Post subject: Re: Laying slabs on sand
PostPosted: Fri Jan 19, 2018 10:36 pm 
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Without being contained and using a membrane the sand will migrate and your paving will go all over the place if you are putting vehicles over it.

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 Post subject: Re: Laying slabs on sand
PostPosted: Sat Jan 20, 2018 12:16 am 
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Even with the sand within the limits of the dugout area in the hard base?

Previous efforts with footpaths where I didn't use sand in a lowered area did have the effects that you describe. But that wasn't so important and indeed the now solidly embedded slabs are quite charmingly higgledy piggeldy.

But slabs which I did lay, again for a short footpath, within a defined depression pressed on sand and grouted with cement powder, have remained stubbornly firm, well positioned, and unyielding.

Admittedly, as I said, these were footpaths, but surely slabs laid by the same principle for light and infrequent car traffic should be ok?

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 Post subject: Re: Laying slabs on sand
PostPosted: Sat Jan 20, 2018 12:29 am 
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Location: somewhere in the "pays de dropt"
Teapot wrote:
Without being contained and using a membrane the sand will migrate and your paving will go all over the place if you are putting vehicles over it.

Sand on its own yes but----
Not with a sand lime mix they wont. I have laid many patios,paths,etc back in the uk and never had a problem.

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 Post subject: Re: Laying slabs on sand
PostPosted: Sat Jan 20, 2018 1:18 am 
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No comment

http://www.pavingexpert.com/layflag1.htm

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 Post subject: Re: Laying slabs on sand
PostPosted: Sat Jan 20, 2018 9:02 am 
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Location: somewhere in the "pays de dropt"
peake wrote:

Good link Peake for those not used to laying slabs.
Its the semi dry method which i have used for years but got out of using cement going back to the old lime mortar method in all sorts of building works as it alows some movement and things dont crack.
Yes if the slabs are well above surounding ground you need to bevel off the edge, this is when i used a cement mix.

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 Post subject: Re: Laying slabs on sand
PostPosted: Sat Jan 20, 2018 10:11 am 
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Thanks all, much food for thought there, I'll wait till the end of next week when the forecast is better. :)

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 Post subject: Re: Laying slabs on sand
PostPosted: Sat Jan 20, 2018 12:51 pm 
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Papibryn wrote:
Teapot wrote:
Without being contained and using a membrane the sand will migrate and your paving will go all over the place if you are putting vehicles over it.

Sand on its own yes but----
Not with a sand lime mix they wont. I have laid many patios,paths,etc back in the uk and never had a problem.

Sorry Pabi, my post was not a criticism of what you had written. I was making a comment on the laying on sand.
I too have laid many a car park and walk/driveways, usually sorting out the previous issues caused by laying on crushed glass (to win some Eco credit or other).

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 Post subject: Re: Laying slabs on sand
PostPosted: Sat Jan 20, 2018 1:21 pm 
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Teapot wrote:
I too have laid many a car park and walk/driveways, usually sorting out the previous issues caused by laying on crushed glass (to win some Eco credit or other).


Oh, if only you'd mentioned that before my last trip to the bottle bank. #-o

Now, how many bottles of wine can I get through next week. :-?

Seriously though, glass as remblai, is it ok?

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 Post subject: Re: Laying slabs on sand
PostPosted: Sat Jan 20, 2018 7:57 pm 
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No David, Glass is absolutely useless! We were brought in to remove tons of it and re lay the blocks and slabs on sand.

The BS flags and thick concrete driveway blocks would rock back and forth as vehicles drove over them because the glass just slides on the next piece, they would rock up to 60mm as a wheel went over it.

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 Post subject: Re: Laying slabs on sand
PostPosted: Sun Jan 21, 2018 1:09 am 
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Teapot wrote:
No David, Glass is absolutely useless! We were brought in to remove tons of it and re lay the blocks and slabs on sand.

The BS flags and thick concrete driveway blocks would rock back and forth as vehicles drove over them because the glass just slides on the next piece, they would rock up to 60mm as a wheel went over it.


Good job it was raining today then, and prevented me rushing out and having a smashing time. :))

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