Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Building & Construction

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Search this Thread Display Modes
Old 03-04-2009, 09:03 PM   #1
Member
 
Join Date: Jun 2008
Location: central Iowa
Posts: 143
Rewards Points: 75
Default

opinions wanted on foundation trench sketch


Our basement is leaking, is put in too deep and is on a flat lot. We can't grade correctly by adding dirt so we plan to take away dirt to create a grade that would direct water to the trench then fill in the "ditch" and trench with gravel using askthebuilder's simple trench plan. (24" deep trench with tile/gravel 4' away from house) I drew a sketch of what I'm thinking. The trench would run around the entire foundation and have an exit pipe to daylight. If anyone can see any flaws in the idea or something you would add or have tried personally fire away! Thanks
Attached Images
 

annie68164 is offline   Reply With Quote
Old 03-04-2009, 09:57 PM   #2
Member
 
Join Date: Jan 2009
Location: South of Boston, MA
Posts: 17,248
Rewards Points: 2,000
Default

opinions wanted on foundation trench sketch


Possibly under the gravel put plastic or something else?
As long as they are sloped correctly & the drain is to daylights I can't think of a problem

Are you sure its not from ground water coming up?
Is the daylight drain a large drop, storm sewer or?

Scuba_Dave is offline   Reply With Quote
Old 03-04-2009, 10:13 PM   #3
Member
 
Join Date: Nov 2008
Posts: 187
Rewards Points: 150
Default

opinions wanted on foundation trench sketch


Make sure all downspouts for the eaves are draining away from the house.

Gary
Gary_602z is offline   Reply With Quote
Old 03-04-2009, 11:10 PM   #4
Old School
 
Willie T's Avatar
 
Join Date: Jan 2009
Location: St. Petersburg, FL Minds of moderate caliber ordinarily condemn everything which is beyond them.
Posts: 3,634
Rewards Points: 2,000
Default

opinions wanted on foundation trench sketch


I wouldn't say "possibly" on the plastic, but definitely. And good, heavy plastic.

As your drawing shows it, think about it. You are really doing nothing, without plastic, to deter the water from continuing to simply absorb straight down the way it was before.
__________________
"True eloquence consists in saying all that is necessary, and only that which is."
François Duc de La Rochefoucauld
Willie T
Willie T is offline   Reply With Quote
Old 03-05-2009, 08:28 AM   #5
Member
 
Join Date: Jun 2008
Location: central Iowa
Posts: 143
Rewards Points: 75
Default

opinions wanted on foundation trench sketch


Thanks for the plastic advice, I didn't really think of that but it makes perfect sense plus it'll keep weeds from popping up! As far as ground -water heck anything is possible but we are on a big hill (even though our lot is flat) so I would think logically it wouldn't be ground water. I am no expert but have read that in most cases what can appear as ground water is surface water that's just taking it's easiest route to any and every crack in your foundation- including the floor. Well, I will post when we complete this project and let everyone know how it went. After a few heavy rains I'll post if it kept water out. I'm sure there are plenty of leaky basements out there who can't afford to dig down to the footings and re-do everything. We are thinking with renting equip. and all else needed this project should be under $1,000 with us doing the labor.
annie68164 is offline   Reply With Quote
Old 03-05-2009, 08:38 AM   #6
DIYer
 
jpsmith's Avatar
 
Join Date: Jan 2009
Location: Pittsburgh
Posts: 102
Rewards Points: 75
Default

opinions wanted on foundation trench sketch


This seems like a large project to undertake without being absolutely sure where the source of the water is. I suggest that you find out for certain whether your problem is surface water draining improperly or if it is ground water coming up. If it's ground water, your design will catch any of it coming laterally, but plenty could come from below, bypassing your gravel pit. I am near the top of a large hill, also, possibly the highest in my entire township, and I had groundwater seepage.

I put a similar trench on all below-grade sides of my house, except that the gravel was right up against the foundation:



This solved most of the problem, but I found that I still had some water coming up through the basement floor a day after a heavy rain. Ground water was coming up and "floating" the slab. To alleviate this, I had to open up a few paths in my slab and install 18" wide by 18" deep gravel pits with perforated drain pipe at the bottom that tie into the drain pipe alongside the foundation.
jpsmith is offline   Reply With Quote
Old 03-05-2009, 08:48 AM   #7
Member
 
Join Date: Apr 2008
Posts: 110
Rewards Points: 75
Default

opinions wanted on foundation trench sketch


This seems like the same type of issue I am having... Like if you look at his sketch, the crack I have in the foundation I posted in another thread (Help on removing concrete stairwell going into Basement.) would be right where his grade would begin.


So how can you diagnose if the water is surface water draining improperly or if it is ground water coming up? I thinking if its ground water coming up, and you dig a hole, you should hit water right?

Last edited by earthad1; 03-05-2009 at 08:54 AM.
earthad1 is offline   Reply With Quote
Old 03-05-2009, 08:57 AM   #8
DIYer
 
jpsmith's Avatar
 
Join Date: Jan 2009
Location: Pittsburgh
Posts: 102
Rewards Points: 75
Default

opinions wanted on foundation trench sketch


I'm not an expert; I've only had to deal with this once. But one suggestion I have would be to dig a hold alongside your foundation. Keep digging until you hit water. If you make it to below the footer and it's still dry, then it's probably surface water. But you can't be sure just yet. cover the hole with a piece of plywood (to keep water out, as well as to keep kids or animals from falling in) and leave it for a few days. Check it every day or half-day to see if any water is pooling in the hole. If it stays bone-dry, it more than likely surface water. If there's water laying in there or if the bottom and sides are not drying out, it's likely ground water. Proper grading goes a long way to shedding surface water, because there's less resistance for the water to just run downhill away from the house than to penetrate the ground and foundation. Groundwater will move upward into your foundation due to pressure.
jpsmith is offline   Reply With Quote
Old 03-05-2009, 09:03 AM   #9
Old School
 
Willie T's Avatar
 
Join Date: Jan 2009
Location: St. Petersburg, FL Minds of moderate caliber ordinarily condemn everything which is beyond them.
Posts: 3,634
Rewards Points: 2,000
Default

opinions wanted on foundation trench sketch


Some people forget that the pipe has to be down to at least the level of the footing.
Attached Thumbnails
opinions wanted on foundation trench sketch-foundation-backfill.jpg  
__________________
"True eloquence consists in saying all that is necessary, and only that which is."
François Duc de La Rochefoucauld
Willie T

Last edited by Willie T; 03-05-2009 at 09:38 AM.
Willie T is offline   Reply With Quote
Old 03-05-2009, 09:06 AM   #10
DIYer
 
jpsmith's Avatar
 
Join Date: Jan 2009
Location: Pittsburgh
Posts: 102
Rewards Points: 75
Default

opinions wanted on foundation trench sketch


+1 to what Willie said. You can sort of see in the pic I posted that my trench goes lower than the footing. My pipe is about where it is in his exaggerated illustration. This allowed me to collect the water from just a bit deeper, and also allowed the sub-slab pipes to have enough fall by the time they connected to the in-trench pipe.
jpsmith is offline   Reply With Quote
Old 03-05-2009, 09:51 AM   #11
Registered User
 
Termite's Avatar
 
Join Date: Apr 2008
Posts: 6,520
Rewards Points: 2,000
Default

opinions wanted on foundation trench sketch


I can't imagine how much gravel that this is going to take. I'm betting a couple end-dumps at least! $$$$$

If the problem is stormwater, this is a very workable solution to manage the runoff and water from the roof, and the depth of the trench isn't such a big deal and the plastic is very important. For groundwater, the depth of the trench is critical and the plastic might be counterproductive.

Another thing I'd stongly consider is a geotextile mesh fabric lining the trench before the gravel is put in, or at least a sock around the perforated pipe. Otherwise there's a good chance that the pipe system could slowly fill with sediment.
Termite is offline   Reply With Quote
Old 03-05-2009, 11:27 AM   #12
Member
 
Join Date: Jun 2008
Location: central Iowa
Posts: 143
Rewards Points: 75
Default

opinions wanted on foundation trench sketch


The reason behind going only 24" deep on the trench is that at 24" you supposedly hit clay and water moves laterally at that point so no need to dig deeper. (This is according to askthebuilder's article) I do like that other poster's diagram and if we were doing a new basement (which we hope to do in about 5 years) we would do that exact thing. At this point we just want to keep the water out or at least the majority of it until we can jack up the house and put a new basement in. The trench would be 4-6 feet away from the foundation so should be able to capture all water because of the slope.
annie68164 is offline   Reply With Quote
Old 03-05-2009, 12:38 PM   #13
Old School
 
Willie T's Avatar
 
Join Date: Jan 2009
Location: St. Petersburg, FL Minds of moderate caliber ordinarily condemn everything which is beyond them.
Posts: 3,634
Rewards Points: 2,000
Default

opinions wanted on foundation trench sketch


I enjoy HGTV, and they have an entertaining little video on this subject HERE.

__________________
"True eloquence consists in saying all that is necessary, and only that which is."
François Duc de La Rochefoucauld
Willie T
Willie T is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Re-grading around foundation? robertr4836 Landscaping & Lawn Care 10 05-23-2009 06:34 PM
replace basement or dig trench w/tile? annie68164 Building & Construction 3 02-19-2009 07:17 AM
Floor Joists Lifting Off Foundation Walls?! cbeingessner Building & Construction 2 06-12-2008 09:39 AM
Stone foundation for a small shack andrgo Building & Construction 10 09-13-2007 02:49 PM
Seed, Sod, or Rock? (opinions wanted) tigerbalm2424 Landscaping & Lawn Care 1 03-23-2007 12:51 PM




Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.