Quick thought.
Why is it necessary to put drainage pioe outside of foundation walls to an area like a garege slab or porch slabs?
I did it anyways but it sort of puzzles me what the purpose is?
True compassion arises out of the plane of consciousness where I “am” you.
Replies
Andy-
Can't tell from the pics, but I'm assume that's perforated pipe with the openings facing down? That's the "right" way to do it (or so I've always been told), but many people don't realize it.
Bob
The pipe has the holes facing down, you can tell because the printing is on top. In Southern Calif. those are not required for patios or garage slabs.
You need the pipe to carry away drainage water (downspouts, grade pitched toward house etc.) There is a possiblity of that water freezing and lifting up the slab and cracking it without the pipe.Tautons revised Foundation and Concrete work book has a great article on it.It also says ita a good idea to run separate drainage pipe for the downspouts and not to connect them to the footing drains. hope this helps. Greg ####
The building inspector was "just" here and gave me a giant thumbs up. Said to me that he doesn't see too many builders here do it as thoro as I did so I guess that means I went overboard.....lol.
He said the same thing to me about why you need the pipe by garage and porch slabs....freezing and cracking.
Thanks,
Be framing next week
andyTrue compassion arises out of the plane of consciousness where I "am" you.
http://CLIFFORDRENOVATIONS.COM
exactlyTrue compassion arises out of the plane of consciousness where I "am" you.
http://CLIFFORDRENOVATIONS.COM
Can you say "freeze lift"?
For a an extreme example, My FFIL's carport slab rests on a 9' retaining wall at the rear. A few years ago he buried a gutter drain from the house gutter across the front of the slab to daylight. . . . With perf pipe.
The flooding in the bottom floor was so bad he drilled a 3/4" hole 3' up the retaining wall to relieve pressure. With a heavy rain the flow out of that hole clears the plane of the wall by a foot before it hits ground.
Now there is a 6' dia area of the slab that has sunken 2 1/4".
He is having a hard time understanding why I want to remove the sunken part before leveling the slab. And changing the perf pipe.
Oops! That wasn't freeze lift. But a
cooluncool story.SamT