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Old 02-19-2008, 01:48 PM   #1
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Foundation & Finishing Basement Question?


I have a 2 year old home and it has this weird plastic stuff between the foundation and floor. It leaves about a 1" gap all the way around. I am getting ready to finish my basement and will need to stud it out obviously. I have a few questions on this.

1. What is it and is it going to pose any extra problems finishing the basment, besides causing me to keep an extra inch away from the walls.

2. I have heard reports of the basement floor "floating" independently from the foundation. Is this the type of floor I have and how do you stud it out and finish it without it moving and destroying all your walls!?

I have noticed when we get a ton of rain, expecially in the colder months that a slight 2-3" moisture line appears along most of the foundation. It never gets worse and it never causes the flooring to become wet, is there anything else I should do in prepping the concrete before I start?

Thanks!

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Old 02-19-2008, 05:31 PM   #2
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Foundation & Finishing Basement Question?


Most likely it's expansion joint material and/or a french drain. Lay an inch of xps on it then your presure treated 2 x 4, not need for any gap IMO.

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Old 02-20-2008, 05:07 AM   #3
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Foundation & Finishing Basement Question?


I found out yesterday atleast what its called. Its a "Owens Corning water resistant sill sealer insulation". I really don't know how it exactly works though, or if covering it up is really a good idea or not. But since I have been advised to set the wall an inch in anyways so the studs aren't resting directly on the foundation I should be ok. If anyone knows that it does and just wants to give me some insight I would appreciate it!
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Old 02-20-2008, 05:42 AM   #4
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Foundation & Finishing Basement Question?


It's serves as an insulation and moisture barrier for your foundation. Don't worry about it.

The moisture you see (in wet colder months) is some cold air escaping through the gap that the insulation sits in. When that air comes in contact with the warmer air in your basement, it creates condensation = slight moisture along that line.

Last edited by AtlanticWBConst.; 02-20-2008 at 05:45 AM.
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Old 02-20-2008, 05:54 AM   #5
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Foundation & Finishing Basement Question?


Thank you for the response. It does infact seem to come and go, it never rises above certain point. I marked this off with chaulk over a year ago. It does form almost all the way around the foundation wall, even in the part that isnt below grade on the walkout area.

In your opinion since I am getting ready to frame out the basement is there anything I should do about this? I am guessing since that gap is there you can't block it so that might not be an option.

Or should I carry on as usual and not freak out over it?

TYVM!
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Old 02-20-2008, 06:45 AM   #6
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Foundation & Finishing Basement Question?


The question is: How much moisture are you getting?
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Old 02-20-2008, 06:56 AM   #7
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Foundation & Finishing Basement Question?


Well, its got a moisture line, highest it goes is around 3 inches. It doesn't actually "drip" or "bead" up. The concrete just looks darker. The line isnt perfectly straight. In some areas it only comes up an inch. It also isn't there year around, it seems to creep up in the colder months. I don't know how to "rate" the true moisture level. How do I figure out if its a problem?

Thank you!
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Old 02-20-2008, 08:40 AM   #8
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Foundation & Finishing Basement Question?


Try sealing that (wall/floor) area with something like a good MP1 (BASF product). Monitor it.
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Old 02-20-2008, 09:02 AM   #9
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Foundation & Finishing Basement Question?


Quote:
Originally Posted by AtlanticWBConst. View Post
Try sealing that (wall/floor) area with something like a good MP1 (BASF product). Monitor it.
Ok, so since the entire floor has a 1" gap with a plastic liner lip sticking up, your saying to "fill" in the gap with something to stop air from coming up through the crack?

I wasn't sure if you were suppose to fill in this crack with their system, but after thinking about it I don't see why it matters. Or are you saying just to apply a sealant over the wet area of the wall itself?

Thank you!
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Old 02-20-2008, 09:38 AM   #10
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Foundation & Finishing Basement Question?


After some research I have found out what I think I have in my basement. The Owens Corning thing has nothing to do with it, I emailed them and asked but they don't have a system like that, only a barrier deal used ontop of the foundation wall.

Anyhow it seems I have something along the lines of a "Water Guard" basement system. Found this link - http://www.basementsystems.com/basem...waterguard.php

Now I am wondering if its a normal problem with the moisture around the base, I would think not. I am still hoping that its just air coming up causing it and not that I am on the verge of a flood. (my sump rarely runs)

Obviously if I plug this gap it negates the use for it, on the other hand if it is infact only caused by air coming in it might be my only option to finish my basement.

I don't know what to do!



I made this up, lol, I am not at home so I photo shopped the wet area. This is the system I think I have and this is what the moisture line is like.

Thanks

Last edited by Taipans; 02-20-2008 at 09:58 AM.
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Old 01-24-2009, 07:54 AM   #11
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Foundation & Finishing Basement Question?


I am interested in what you ultimately did because I have the same french drain design with a lip between the wall and the floor. I finished off my basement but, hesitantly decided to leave the lip open so that the drainage system could remain intact. Its a new refinish, so I don't know how it will ultimately turn out. I do feel a little air coming up from the lip but its too early to know if there will be any moisture issues that result because I left the lip open. If your moisture only went up 3 inches, what were you most concerned about. Your plate is pressure treated, right?
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Old 01-24-2009, 09:28 AM   #12
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Foundation & Finishing Basement Question?


This is a perimeter drain system. The lip is designed to capture water from the wall and direct it into the drain pipe located below the surface filter and gravel. Just build the wall out from the foundation wall and don't worry much about this drain system. Even covering it will not stop it from working.
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Old 01-26-2009, 06:56 AM   #13
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Foundation & Finishing Basement Question?


I had the cities building department come out and take a look. I was told to go ahead and seal up the crack so excess moisture wouldn't be blown up the backside of the wall. So I took a polymer and sealent / adhesive and sealed from the floor to the wall leaving the gap in place. I did not seal the unfinished side so some airflow could circulate. I felt this was the best option so It could be removed easily down the road if needed. It was also cheap and only took an afternoon to do. I feel better knowing moist air is not blowing up the studs anymore.

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