Laying down a base material under concrete that will be poured.

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Old 03-16-14, 08:09 AM
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Laying down a base material under concrete that will be poured.

We had a pool installed. The mason is coming to pour concrete and around pool and walkways. I have a 30 foot sloped trench with 3/4" crushed stone with fabric laid exactly next to the straight 4' * 30' concrete area the concrete walkway will be done. The mason will prepare the soil for the concrete.

So here is the question:

Can a fabric be laid down and then 1" of crushed stone be placed under the concrete so the soil will not shift and water can run into the trench. I am more concerned about fabric that can allow water to soak through and move water. Can landscape fabric be used under stone which is under concrete?

Basically what I am trying to do is have all fabric and stone under the concrete that runs into the French drain. The allan blocks will be eventually placed next to the concrete. There will be a so slight gap between the block and concrete so I need to make sure there is a rock base underneath to grab water and move it along. It is a max of 1/4" - 3/4" gap (if this makes sense). This is under the walkway. Here are some pictures.

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Old 03-16-14, 10:29 AM
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Your statement doesn't make sense--"I am more concerned about fabric that can allow water to soak through and move water."

Water moves through fabric, while solid particles of soil won't.

Is there still a question?
 
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Old 03-16-14, 11:59 AM
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Can fabric under concrete do any harm, which is over soil, guess that is the real question, to keep soil in tact? Thanks
 
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Old 03-16-14, 06:07 PM
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I don't see any reason for the fabric. The crushed stone & the cement will prevent weeds from appearing. The water will flow with or without it. Why do you want it?

Are you from Catanzaro, Calabria. My grandmother came from there in 1916.
 
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Old 03-17-14, 12:48 AM
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i would use fabric to line the excavation - the WHITE stuff,,, we install it in sub-surface drainage systems to keep soil out - what's the harm ? + it helps the economy win - win !

as far as weeds, pull them when you decide they're not a flower

ps - what's an ' allan block ' ? ? ?
 
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Old 03-17-14, 01:59 AM
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stadry--Google is your friend.

Use it to research Allan Block, a well-known and successful precast block wall manufacturer. Been around for quite a few years, and put out a nice looking and well-performing product.
 
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Old 03-17-14, 03:46 AM
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I came from Calabria, not Catanzaro. Liked the name. My town is Vivo Valentia. Arrived here in 1973.

The concrete may slope from house to crushed stone so I need all water to channel in from concrete to french drain and out. There will be a gap of 1" inch max from edge of concrete to new block and I want to make sure that it is not soil only. This could create weeds, soil run off, etc. Have to create drain first. So I want fabric to rub from drain slightly under concrete. I will post old picture so it is more clear. The mason may slope the concrete down and definitely there will be channel drains. I can not dig after the concrete is poured as the soil may move so everything has to be compacted. So the mason stated that he will use the crushed stone under the cement but want to make sure that everything is ready for him.
 
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Old 03-17-14, 04:04 AM
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Below are some pictures before the concrete walkway was broken up and the old blocks. Under the old blocks there was just soil and over the years water kept moving the soil over & the blocks were all uneven. So I decided to take everything out, break the concrete and will install the new allan blocks and from the previous pictures the crushed stone. There will be a gap as between new concrete and blocks.

Can I lay regular landscape (heavy duty) fabric about 1' from allan block under the concrete with some crushed stone. Which stone should I purchase that works well under concrete. I believe the mason said something about CP stone or CB, do not recall the correct term.

Thank you.


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Old 03-17-14, 07:38 AM
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What about a mix of Portland cement & sand (3 sand to 1 Portland) between the crushed recycle & the block?

Do you know of a town called Tiriolo?
 
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Old 03-17-14, 10:05 AM
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It is only 1" max break and I am more concerned about moisture building up under the concrete. Or will the landscape fabric not do any harm.

And yes I have heard of Tiriolo.

Thank you.
 
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Old 03-17-14, 05:23 PM
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I don't think that the fabric will do any harm. If you don't mind the cost, go ahead.
 
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