What is the best way to fix this wall? (foundation, pool, insulate)

[tiberiusP]

Hi, this is a follow up to the initial thread here. Some background can be found here //www.city-data.com/forum/long-island/1996757-drywell-leak-cesspool-considerations.html but below is the short short version

-Just moved in the fall, drywell water was backing up and seeping into the basement
-as of last week, dug up drywell, cleaned the lines and added a second well further from the home.


So the source of the water seepage has been addressed. But since we live on a hill with a bit of a slope toward the house, I plan to grade more away from the house. But not before I address the foundation cracks.


--->I would like to seal the foundation crack. What is best? Should I dig up the outside, near the foundation and use that black tar/seal type substance to prevent further water seepege?

Or is this something I fix from the inside? I would like to make this my DIY project and would appreciate any advice. THank you so much.

HEre is the issue.

http://i38.photobucket.com/albums/e1...psywc5loeg.jpg

[K'ledgeBldr]

The correct way is to seal it from the source side (exterior). But not "tar"- tar becomes brittle. Use a "membrane" material; it has more elasticity to bridge cracks as they move.

The main thing to remember, apply to a clean (as possible) and dry surface then protect it with some other material (plastic, rigid foamboard, fiberglass matboard) so backfilling doesn't damage it.

[MrWillys]

Chapter 4 - Foundations

[AustinB]

Definitely repair from outside. I understand that there is some type of epoxy or such, that can be injected into the crack. You then put like an ice and water shield over the outside of the crack. Make sure it is stuck REALLY well. Then the tar type seal, insulate and back fill. I'd hire some body to do it. We have to fix a crack in one of our basements.

[tiberiusP]

I assume MrWillys meant the following below as chapter 4. It calls for sealant at the joint but I guess the plastic sheet or foamboards suggested are not a bad idea as well. Read on:

R406.4 Precast concrete foundation system dampproofing.
Except where required by Section R406.2 to be waterproofed, precast concrete foundation walls enclosing habitable or useable spaces located below grade shall be dampproofed in accordance with Section R406.1.
R406.4.1 Panel joints sealed.
Precast concrete foundation panel joints shall be sealed full height with a sealant meeting ASTM C 920, Type S or M, Grade NS, Class 25, Use NT, M or A. Joint sealant shall be installed in accordance with the manufacturer’s installation instructions.