Hello to all, been awhile…again!
Doing a basement;
Previous work included a 4″ waste line installed through a 6″ by 6″ cut made through the 8″ block wall. Cheesy looking if you believe me, especially since my operations right now are those that are related to the future dryness of the space.
Is there any reason that I cannot simply mix up some real stiff concrete and stuff it into the gaping area (grouting I suppose) that remains around the 4″ that exits to the outside?
Mortar?
I’d like it to compete well against the eventual water the gets along the foundation outside.
Or should I for some reason be using a hydraulic mix or some such instead??
Gratefully,
Hunts
Replies
Around here code would require the pipe be wrapped with foam to protect it from concrete abrasion.
Is there some reason that you would expect substantial hydraulic pressure from the outside?
I thought this was going to be a thread from someone who doesn't go to the tavern any longer. ; )
I'm thankful for the loyal opposition! It's hard to learn much from those who simply agree with you.
Thank you hasbeen.
No I really do not expect alot of hydraulic pressure from the outside. The soil situation around the offending intersection is 30 years old, and seven feet down from grade level. I am just in my "overbuilding" mode of thinking. You might have read the other responses; I cannot however get (without serious excavation) to the outside of it. So I either stuff it the best I can with concrete-at least that was my notion- or perhaps even expanding foam the hell out of it. The foam just doesn't have that substantial a feeling about it.
May I have your thoughts again as well?
Since you will not dig down to deal with this on the outside, you can pretty well expect it to leak, unless you live in the desert.
Welcome to the Taunton University of Knowledge FHB Campus at Breaktime. where ... Excellence is its own reward!
Hunts,
Personally, I hate to set wall penetrations in concrete. It's like putting a twig in a giants hands and expecting it not to break if he twitches.
In this situation, I would fill the void with "Great Stuff", the original formulation.
If you want it to look like the pipe just runs into the concrete, cut the foam back about 1/8"-1/4" and skin it with hi-flex tile grout. Loosely wrap the pipe with 2 to 4 layers of elec tape to leave a small gap twixt the pipe and grout. After the grout sets, pull the tape out.
Puuurrrteee
SamT
What does the ground do outside the house? Level? Slope away a little? A lot? Slope toward the house (hopefully not!)
Do you live on a relatively dry ridgetop? A soggy valley?
Has it been leaking? How much? What is the future use of the space?
Such a penetration would be inconsequential in my house, but in my Dad's house it would be a spring at certain times!I'm thankful for the loyal opposition! It's hard to learn much from those who simply agree with you.
I use Waterplug, a hydraulic cement. You should apply it both on the exterior and interior, completely filling the hole Trowel the patch smooth. After drying, caulk around the pipe edge and coat the patch with waterproofing on the exterior. Do a real nice job or it will leak in the future.
Beat it to fit / Paint it to match
After reading your question and the other replies, I was thinking hydraulic cement is best because it expands as it cures and would seal it best. Could you reach the outside of the block with a grout bag (and maybe a very long tube to deliver the cement) and squeeze cement between the outside of the block and the pipe using the bag, then plaster it on the inside with a trowel? Or you could somehow stop up the core of the block at the bottom with foam and then more or less grout the block full of mortar or hydraulic cement.
I've used expanding foam, mortar and concrete, they all failed. Waterplug is simply a cement like powder you mix with water. It's called hydraulic because it expands as it dries unlike the others that shrink. The pipe isn't going to move with seven feet of dirt on it, you want a tight seal or the spring rains and run off will find their way in. It doesn't take much to dig down on the outside compared to repairing later. Do it right or you will regret it. I learned the hard way.
Beat it to fit / Paint it to match
So does this mean that you are recommending the "waterplug" mentioned? Or is there another product you are endorsing?
Thank you, Hunts
The Waterplug brand is the only one I remember using. It is pretty commonly available but other hydraulic patching cements may work as well.Beat it to fit / Paint it to match