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Old 01-25-2014, 08:11 PM   #1
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Just wondering if my foundation has issue


I am working on replacing drainage around my home (I found that there was the old one and it doesn't work. After we removed the old drain, I noticed this (please see attachment) on a section of the foundation. Just wondering if this is something I need to concern about?

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Old 01-25-2014, 08:30 PM   #2
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Just wondering if my foundation has issue


Looks like someone got too close sometime ago with a Brush hog or something else. BTW, how far down does it go to the Footers?

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Old 01-25-2014, 10:22 PM   #3
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Just wondering if my foundation has issue


Ayuh,... That Is pretty odd lookin',....

Where about's on the planet is it,..??
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Old 01-25-2014, 11:28 PM   #4
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Looks like someone got too close sometime ago with a Brush hog or something else. BTW, how far down does it go to the Footers?
Good question. I will try to dig more tomorrow. I think it still goes down more. The first, non-painted layer is the slab.

This is about 70 year old house in California.
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Old 01-26-2014, 08:16 AM   #5
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Just wondering if my foundation has issue


how long do you expect that perf pvc pipe to run free w/o clogging up ? no drainage stone, no filter fabric, not enough slope ? might not take long for this 1 to stop working, too what's the purpose of the pipe - redirection of runoff from the backyard or what ?
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Old 01-26-2014, 08:32 AM   #6
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Just wondering if my foundation has issue


Also no water proofing on the wall before back filling?
The picture to me looks like someone just may have used a damaged block and the roots have started to work there way in though the mortar.
One of my houses was so bad the roots had cracked the block and there was roots growing inside the voids in the block.
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Old 01-26-2014, 11:18 AM   #7
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One of my houses was so bad the roots had cracked the block and there was roots growing inside the voids in the block.
Roots cause a lot of damage to masonry walls round here. Here's one I had to rebuild because the top had been planted out.
Just wondering if my foundation has issue-phpgpliaaam.jpg

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Old 01-26-2014, 02:24 PM   #8
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GOOD CATCH, joe,,, we use hlm5000 for waterproof coating & protect the 5000 w/20mm pond liner prior to backfill,,, you can also use waffleboard but the liner's easier to wrangle about in a hole

we also install cleanouts along the way - usually @ the high end of the drainage system

speaking of crack'd blocks, we're working on 1 where a tree was planted for landscaping alongside the cmu bsmt wall,,, evidently no 1 forsaw the tree would grow root system was a ***** to remove ( hand digging ),,, the trunk caused significant lateral pressure which likely caused bsmt wall to crack requiring further repair,,, [ can you say unanticipated/undiscovered site conditions ? ] change order ! ! !
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Old 01-26-2014, 03:19 PM   #9
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Just wondering if my foundation has issue


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how long do you expect that perf pvc pipe to run free w/o clogging up ? no drainage stone, no filter fabric, not enough slope ? might not take long for this 1 to stop working, too what's the purpose of the pipe - redirection of runoff from the backyard or what ?
I realized someone would misunderstand about that pipe - sorry for that. We just place it there to see the level and how it fits. There will be sleeve and fabric and gravels.

This pipe is running off from backyard to back yard which is lower.

But, I didn't think about sealing off the foundation. Does it need to be sealed even if I don't have foundation?
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Old 01-27-2014, 07:07 AM   #10
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IXNAY on the sleeve/sock,,, IF you must use apron/vest store mtls, the better choice is the peanut-encased pipe,,, we use 57stone, 4" pipe, & filter fabric surrounded trench thereby increasing x 3x avail filtered drainage space

unlikely its just a slab on grade w/o a perimeter foundation of some sort - even a thickened edge/monopour/unipour
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Old 01-27-2014, 12:10 PM   #11
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Just wondering if my foundation has issue


I had water coming into the house with a slab like yours.
Added a French drain and added another line just for the gutter drains, water proofed the wall, regraded and never had another problem.
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Old 01-27-2014, 10:10 PM   #12
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Just wondering if my foundation has issue


That looks like 4" perforated pvc pipe.
That also looks like dirt under the last row of foundation blocks
And it appears you've dug at least 8" - 10" below the bottom of the foundation wall, straight down......and there's no footing.

Is this the case ?

If so, first you have to stop.
You are undercutting the bearing for your foundations.......this will cause a settling failure of your foundation.
You need to move the drainage pipe about a foot away from your foundation with the trench gradually sloping towards the pipe.
You also need to bring in some gravel and compact it real well in the trench you've already dug next to the wall and flush to the bottom of the foundation wall.

The good thing is your using the pvc perforated pipe........much better than big "o" and especially the old clay tiles.
Pressure wash the foundation blocks, let dry, trowel construction grout over the joints and any cracks, sealcoat with foundation tar really well, let dry, place at least 8"-10" drainrock over the pipe and against the foundation, place a good quality landscape fabric over the rock.
And backfill.
Make sure the grade slopes away from the foundation.........after the backfill has settled.

A french drain shouldn't be needed if you do this properly around the whole foundation.

Or bring in a professional.

Last edited by Gary Evans; 01-27-2014 at 10:28 PM.
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Old 01-28-2014, 09:43 PM   #13
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Just wondering if my foundation has issue


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That looks like 4" perforated pvc pipe.
That also looks like dirt under the last row of foundation blocks
And it appears you've dug at least 8" - 10" below the bottom of the foundation wall, straight down......and there's no footing.

Is this the case ?

If so, first you have to stop.
You are undercutting the bearing for your foundations.......this will cause a settling failure of your foundation.
You need to move the drainage pipe about a foot away from your foundation with the trench gradually sloping towards the pipe.
You also need to bring in some gravel and compact it real well in the trench you've already dug next to the wall and flush to the bottom of the foundation wall.

The good thing is your using the pvc perforated pipe........much better than big "o" and especially the old clay tiles.
Pressure wash the foundation blocks, let dry, trowel construction grout over the joints and any cracks, sealcoat with foundation tar really well, let dry, place at least 8"-10" drainrock over the pipe and against the foundation, place a good quality landscape fabric over the rock.
And backfill.
Make sure the grade slopes away from the foundation.........after the backfill has settled.

A french drain shouldn't be needed if you do this properly around the whole foundation.

Or bring in a professional.
I'm thinking you must be looking at a completely different set of pictures, because here's what my trained eyes see:

- 3" NON-perforated sch. 40 PVC, which is being installed next to the foundation to service a yard drain, etc..., and it just happens to to be that next to the foundation is the most convenient place to dig the trench.

- There's no basement under the concrete first floor, you can damproof all you want, it won't make a difference inside.

- I have no idea how you can tell that the OP is undermining the footings, I see block below the excavation.
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Old 01-28-2014, 09:44 PM   #14
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Just wondering if my foundation has issue


"Roots cause a lot of damage to masonry walls round here. Here's one I had to rebuild because the top had been planted out."

I think you forgot the before pictures Stu...................
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Old 01-28-2014, 10:12 PM   #15
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we must be looking at different pictures Jomama.

I'm referring to the pictures in the first post.......at the top.

You can clearly see the holes at the top of the perforated pvc pipe and that sure looks like dirt to me behind the pipe and under the concrete block foundation.
But like most of the pictures and posts here in these forums it's hard to really know what's going on unless your actually there to inspect it.

I must have missed the part that says this is a slab on grade foundation.
The poster just said there's the slab........but it's below the block foundation so I assumed we were looking at the basement or crawlspace slab.
You mean there's not even a crawlspace ?

Actually......this is not making any sense.
We need much better pictures...........showing the entire structure from different angles.

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Last edited by Gary Evans; 01-28-2014 at 10:22 PM.
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