spotted the first damp spot

tragusa3May 7, 2007

We're currently building on a walkout basement. Poured concrete walls. About 50% of walls above grade. The walls were sprayed with "mastic" and covered with "shockwave" drain board. They also used an egg carton looking channel drain that pipes out to daylight.

The foundation was poured back in early February and we've kept a close eye for damp spots since.

This weekend we had a good soaking rain and we noticed a spot about the size of a pack of cigarettes that was damp. It was right where the wall meets the floor. The basement has otherwise not had a single sign of dampness.

How concerned should we be? would a dehumidifier keep this sort of stuff in check? should I not accept it and insist that they dig out the soil and re-apply all waterproofing?


Thank you for reporting this comment. Undo

Hard call without seeing it. If your basement walls are still accessible--I guess they are or you wouldn't have noticed the damp spot--consider applying a crystalline waterproofing product such as Permaquik. This goes into the structure of the concrete and does not wash or flake off like other coatings.

I would also double check your grading and any way that water in a heavy storm might load up against the foundation.

    Bookmark   May 7, 2007 at 6:18PM
Thank you for reporting this comment. Undo

I would bring it to the attention of the builder. I discovered a leak soon after my foundation was poured. They fixed it right away. That was 3 years ago and today I'm still enjoying a clean and dry basement.

just my .02

    Bookmark   May 7, 2007 at 8:11PM
Thank you for reporting this comment. Undo

Thanks for the input.

The interior of the walls are still exposed. The exterior has been backfilled. The grading is not final yet, and getting water away from the wall will be improved slightly.

I did call it to the builders attention. Haven't heard anything back yet.

Thanks again.

    Bookmark   May 9, 2007 at 1:48PM
Thank you for reporting this comment. Undo

Building new addition now w/basement that was weatherproofed with GMX ULTRA and 2 inch Outside insulation board also.
Have noticed wet spots on heavy rains in corners. However I backfilled completely with gravel 4 foot away from all walls of my 44 by 20 ft addition. Builder says lack of gutters and lack of grading is contributing to moisture I see now. It will correct when those parts of the homebuilding are corrected.
Getting Danby 58 pint dehumidifier from after reading reviews here & on Seems that first year moisture from building materials etc. contribute to humid condition for 9 mos - 1 year. Danby 58 pint unit has drain connection & 5 yr warranty.

    Bookmark   June 3, 2007 at 11:50PM
Sign Up to comment
More Discussions
Electrician on his way...
OK, we are in the beginning stages of wiring - and...
Ductwork through joist question
Hi, I know this is possibly controversial...I understand...
Adding toilet to basement
We are adding a half bath to our basement when we start...
making the crawl space more useful?
My house has a (vented) crawl space between 2 and 3'...
Basement tile grout sweating
Hi Experts, We have a new house (1 year old, Hamilton,...
Joe Regular
People viewed this after searching for:
© 2015 Houzz Inc. Houzz® The new way to design your home™