[diychat09]

http://s10.postimg.org/c3ymaukzt/IMG_6356.jpg

Hi,
We are putting a french tile in our basement just in case if it leaks. so we cutting through the concrete and see water seeping through the ground. see picture this 6 inch deep trench will fill from water from ground within 10-12 hrs.

I have few questions...
1- is this leak due to hydrostatic pressure. is it something to be worrried about down the line?
just fyi that the water is not over flowing over the slab it just rises up at slab level.

2- we want to put a drain tile along the wall and tie into an existing storm pipe which goes out in the front yard but the problem is there is no pitch so even if we put the drain tile there will be hardly any pitch. In this case will the drain tile work and move into the storm pipe even if the drain tile and storm pipe are same level? is there any benefit?

 

[joecaption]

Want to spend time and money, then spend it outside.
Waterproofing the foundation, making sure grade runs away from the foundation.
Working gutters.
No mulch or flower beds against the foundation.
May even need a french drain outside.

 

[diychat09]

The person who is doing it says outside does not work. you have to work inside. We can talk about what works better inside or outside but for now can I get some feedback on the inside system and the questions I have put above?

 

[Canarywood1]

The person who is doing it says outside does not work. you have to work inside. We can talk about what works better inside or outside but for now can I get some feedback on the inside system and the questions I have put above?

Doing it outside is the proper way, doing it inside is the second choice, i'd be getting some other opinions if it were mine.

 

[Yodaman]

The person who is doing it says outside does not work. you have to work inside. We can talk about what works better inside or outside but for now can I get some feedback on the inside system and the questions I have put above?

Get a new contractor. Does it make sense to let water past the foundation wall and then deal with it? Putting the drain tile inside is just easier.


If you are dealing high water table in lieu of drainage water, buy a sump pump and never finish the basement.

 

[Daniel Holzman]

Water flows from higher water elevation to lower water elevation. The pitch of the pipe has only a small influence on the amount of flow, the major driving factor is the difference in water elevation between the inlet and the outlet. So you need to determine if the water level at the outlet is sufficiently lower than the water level in the basement.

You typically want at least a 1% water slope, meaning that for every hundred feet of pipe, you want the water to drop 1 foot, preferably 2 or more feet. You need to make measurements of the water level at the critical time of year, which is typically the spring. You cannot drain a basement tile into a storm drain if the water level in the storm drain is equal or higher than the water level in the basement, the water from the storm drain will run into your basement, which defeats the purpose of the drain.

 

[oh'mike]

Most interior drain tiles are directed to a sump pit--then pumped up and out the side of the house---then channeled away from the foundation.

This might be a more sure fire solution if you don't think the storm drain is working properly.

 

[jomama45]

http://s10.postimg.org/c3ymaukzt/IMG_6356.jpg

Hi,
We are putting a french tile in our basement just in case if it leaks. so we cutting through the concrete and see water seeping through the ground. see picture this 6 inch deep trench will fill from water from ground within 10-12 hrs.

I have few questions...
1- is this leak due to hydrostatic pressure. is it something to be worrried about down the line?
just fyi that the water is not over flowing over the slab it just rises up at slab level.

Impossible to tell exactly where your water issues are coming from from one terrible picture on the internet, but consider this: A huge hole is dug 8-10' deep in the hard, virgin ground. It's backfilled on the outside with well perculating stone and soft, disturbed soil. Water will always be more likely to be attracted to this area than hard, virgin soil, so you need to contend with it. It's often refered to as "excagerated water table" within the trade.

2- we want to put a drain tile along the wall and tie into an existing storm pipe which goes out in the front yard but the problem is there is no pitch so even if we put the drain tile there will be hardly any pitch. In this case will the drain tile work and move into the storm pipe even if the drain tile and storm pipe are same level? is there any benefit?

Interior, or even exterior, draintiles are never pitched, as water always finds it's own level, especially in a draintile system with good, clear stone. The only time I've ever heard of pitching interior draintile has actually been on this forum.

Obviously, the storm sewer pipe needs to be pitched for it's entire length. I would opt for having the new interior draintile slightly above the storm sewer pipe, like at least 1/2".

 

[jomama45]

Most interior drain tiles are directed to a sump pit--then pumped up and out the side of the house---then channeled away from the foundation.

This might be a more sure fire solution if you don't think the storm drain is working properly.

Good point Mike. If we were doing the work (and we've done a lot of them through the years) we would undoubtedly be installing a sump basin tied into the interior draintile as well. You may not need to put a pump in it, but it's a great way to monitor water levels, as well as serving as an easy bail-out plan if/when the storm sewer line fails. It's actually code here to install a sump basin in every new house here, even on full exposure basements that will likely never need them. Sump pumps are optional by code, however.

 

[firehawkmph]

When I was building new homes, we put drain tile on both the inside and outside. Inside flowed to a sump if necessary. If the storm sewer was deep enough, it was connected by a sleeve to the exterior and flowed out by gravity. The inside was just an extra precaution in case of hydrostatic pressure under the slab. Cheap insurance. But in reality. Outside drain tile should do the most work.
Mike Hawkins:smile:

 

[diychat09]

Will the Outside drain tile work for the existing water under the slab? I might consider that as well.

 

[Bondo]

Will the Outside drain tile work for the existing water under the slab? I might consider that as well.

Ayuh,.... So long as the outside tile is Under the water level inside, Ya the water level will drop,.....

2- we want to put a drain tile along the wall and tie into an existing storm pipe which goes out in the front yard but the problem is there is no pitch so even if we put the drain tile there will be hardly any pitch. In this case will the drain tile work and move into the storm pipe even if the drain tile and storm pipe are same level? is there any benefit?

As noted above, a 4" tile has 4" of drop, even when dead level,....

 

[Yodaman]

Will the Outside drain tile work for the existing water under the slab? I might consider that as well.

When the outside system is working properly there should be no water under the slab, assuming we are talking drainage water. If you have a high water table and getting water under the slab or coming up thru the slab then it will need to pumped from a sump hole.