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Old 07-20-2011, 10:07 AM   #1
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Perimeter drain on interior footing


I'm building an addition with a basement next to my existing home with a walk-out basement.

Currently, the exterior wall that's mostly below grade seems to allow a small amount of surface water at the floor-wall joint.

The new slab will be sitting below the height of the existing floor, so I anticipate that this problem will go away. The new basement will get a perimeter drain, so I'm not sure if this soon-to-be interior footing will need its own drain. Should I bother installing drain tile along this footing?


Last edited by benjamincall; 07-20-2011 at 10:25 AM.
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Old 07-20-2011, 10:48 AM   #2
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Perimeter drain on interior footing


We never have and have fortunately not had a problem there. We do pour a concrete bulkhead against the existing floor & footing in this situation though, which surely helps block the water. You will want to put an additional sump crock in the new,lower basement though.

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Old 07-20-2011, 10:54 AM   #3
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Perimeter drain on interior footing


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Originally Posted by jomama45 View Post
We never have and have fortunately not had a problem there. We do pour a concrete bulkhead against the existing floor & footing in this situation though, which surely helps block the water. You will want to put an additional sump crock in the new,lower basement though.
I would like to avoid a sump, since the new basement will be fully finished. Won't drain tile and a dimpled membrane be sufficient? The new slab will be five inches lower than the existing slab. I don't believe I have a water table issue.
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Old 01-04-2012, 01:13 PM   #4
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Perimeter drain on interior footing


So, a number have months have passed since I posted to this thread. In the meantime, I ran out of money to excavate the basement for the addition.

I still have periodic water issues from the floor-wall joint on the existing wall, so I'm going to remove a temporary carport that probably channels a lot of water toward the foundation. What can I do as a temporary measure to further divert rainwater away from the problem area? Should I dig down to the footing (only about four feet down) and affix some 6 mil poly sheeting to the concrete block? I guess I have to backfill to avoid creating a moat, right?

Last edited by benjamincall; 01-04-2012 at 05:35 PM.
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