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Old 04-07-2008, 08:08 AM   #1
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Drain Tiles, Gravel/ no Gravel?


Looking into drain tiles for around my foundation (sides) on a walk-out basement.
The guy at the PVC store is telling me if I get the perforated black pipe with a sock on it, that gravel is not necessary.
This seems to go against things I'm reading elsewhere, but would surely be more convenient.
Also, do the tiles absolutely need to go all the way down to below the footer?
Thanks to the group for your time and input.

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Old 04-07-2008, 08:44 AM   #2
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Drain Tiles, Gravel/ no Gravel?


Usually, just a sock with will plug if the natural soil is easily erodes - like silt, silty clay.

The ideal is a well graded range of clean sand and rock. The fill should also be 6" below the pipe. With the right material, a sock is not required, but some people use them.

If you just use 3/4" rock and a sock, the system may work for a while, but the voids in the rock can fill with silt over time.

The blend of CLEAN sand and rock keeps the water velocity down and slows the erosion and flow of silt.

The real hidden value of a properly installed drain tile project is that it keeps the moisture content of the soil lower at all times, so there is not a big surge of water in the system from surface water immediately after a storm/melt. - It drain water out all the time and keeps the local watert able down.

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Old 04-07-2008, 08:39 PM   #3
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Drain Tiles, Gravel/ no Gravel?


our company only does wood foundation, part of the system is 1 to 2 foot of pea stone covered with plastic or felt paper then back filled with dirt. the plastic protects fine particals ( clay ) from migrating into pea stone once the soil settles the plastic no longer has a use.
if you are in good drainable granular sand , you do not need stone at all. install drain tile around all of basement and run to daylight( some where lower than your footings ) are you in clay?
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Old 04-07-2008, 09:01 PM   #4
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Drain Tiles, Gravel/ no Gravel?


Yes, I'm in Southern Indiana, A good amount of clay. I am on a hill, so the sloping to daylight will not be a problem. We had never seen a drop of water in 5 years of living here until we got the 8-12 inches in a 24 hour period about 2 weeks ago. then our basement took on quite a bit. I'm trying to make sure this doesn't happen again. Pea gravel is what is needed to lay over and under the tile? Is the black stuff with the sock on it a good idea?
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Old 04-08-2008, 11:13 AM   #5
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Drain Tiles, Gravel/ no Gravel?


Quote:
Originally Posted by B Parker View Post
Yes, I'm in Southern Indiana, A good amount of clay. I am on a hill, so the sloping to daylight will not be a problem. We had never seen a drop of water in 5 years of living here until we got the 8-12 inches in a 24 hour period about 2 weeks ago. then our basement took on quite a bit. I'm trying to make sure this doesn't happen again. Pea gravel is what is needed to lay over and under the tile? Is the black stuff with the sock on it a good idea?
yes on the black sock,,also part of the water problem may be from the quakes we had(hairline cracks),,,,brother had to add a sump in his walk out basement in Newburgh,,,
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Old 04-08-2008, 07:55 PM   #6
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where did you notice the water coming in from?
where flor meets walls, cracks in walls,
misc spot in middle of walls?
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Old 04-09-2008, 09:25 AM   #7
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In a corner where the floor meets the walls
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Old 04-09-2008, 06:51 PM   #8
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Drain Tiles, Gravel/ no Gravel?


getting pea stone and drain tile around your basement will definitly help, unfortanitly you need to dig down to your footing. being on clay, water will always follow the clay bed. theres no way of knowiing what they did below basement floor when it was built. so, adding perimiter drain will be most help for the money.
hopefully you dont have to much landscaping to ruin
good luck
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Old 04-13-2008, 10:46 PM   #9
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Drain Tiles, Gravel/ no Gravel?


Gravel for sure! It is a good idea, and is required by the code.
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Old 04-14-2008, 10:46 AM   #10
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Drain Tiles, Gravel/ no Gravel?


Pea gravel? Is there a difference in Pea stone" and "Pea gravel"?
I have heard both terms. Concretemasonry refers to 6" below the pipe, is it also advisable to go over the pipe with the pea gravel?
I am assuming that the 6" below is 6" below the footer? the pipe is supposed to be lower than the footer correct?
Thanks to all for the help
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Old 04-14-2008, 02:46 PM   #11
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The IRC code requires that the gravel be one sieve size larger than the holes in the drain pipe. Pea gravel will likely work fine, but you might consider something slightly larger, like 1/2" clean.

Be sure you don't use something like AB3 or road base that has a lot of fines in it, which will harden up like rock. Sounds stupid, but I've seen it done.
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Old 07-15-2010, 11:24 PM   #12
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Drain Tiles, Gravel/ no Gravel?


Thanks for this post, it helped answer part of my question.

The other question I have is that if you install the corrugated drain pipe with a sock on it and backfill with gravel, do you have to put fabric on top of the gravel before you backfill with soil? It makes sense so the gravel doesn't get the dirt you backfill with....but then again, is it just redundant?

thanks!
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Old 07-16-2010, 10:57 AM   #13
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Drain Tiles, Gravel/ no Gravel?


Have you seen these?:

http://www.lowes.com/pd_308700-676-E...ategoryDisplay
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Old 07-16-2010, 11:12 AM   #14
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Drain Tiles, Gravel/ no Gravel?


That looks pretty cool... A different idea. I like it.

However, I'm just asking because we're building a house and the builder is using the corrugated slotted drain pipe with a sock around it. I'm assuming they will backfill it with gravel. I'm just wondering if some sort of fabric is required by code on top of the gravel.

Thanks!
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Old 07-16-2010, 02:02 PM   #15
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Drain Tiles, Gravel/ no Gravel?


IRC R406.4.2 discusses perimeter drains in detail.
Here's a link to the 2006 IRC, New Jersey edition:

http://www2.iccsafe.org/states/newje...l_Frameset.htm

Chapter four discusses foundations. You'll find 406.4.2 on about page 86.


Last edited by benjamincall; 07-16-2010 at 02:33 PM.
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