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Interior Inspections Contains discussions about the interior portion of a home inspection. This includes stairs, walls, floors, ceilings, smoke detectors, etc.

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  #1  
Old 5/31/18, 12:18 PM
Michael Larson's Avatar
Michael Larson Michael Larson is online now
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Default Trapped moisture

Trapped moisture-100_5555-jpg
2005 build
Walk out basement
Poured foundation
House wrap behind vinyl siding over OSB
Unfinished basement walls
Trapped moisture behind vapor barrier on all but poured foundation portions.
Fiberglass batt insulation.
OSB not affected yet where checked
Minor organic growth. No odors.

I usually recommend removal of vapor barrier to let it breathe and dry out completely along with the use of AC and dehumidifier.


Any other views on this issue?



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  #2  
Old 5/31/18, 12:38 PM
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Default Re: Trapped moisture

Why did it get wet in the first place?




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  #3  
Old 5/31/18, 3:00 PM
Michael Larson's Avatar
Michael Larson Michael Larson is online now
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Default Re: Trapped moisture

Quote:
Originally Posted by rlewis5 View Post
Why did it get wet in the first place?
Apparent condensation. It does that up here. Moist air cool basement. Seen it many times.

Owner stated she seldom uses the AC and no de-humidifier present.

We no longer build way this because this happens. We use blue or pink board instead.



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  #4  
Old 5/31/18, 3:20 PM
Christopher Currins, CMI Christopher Currins, CMI is offline
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Default Re: Trapped moisture

Quote:
Originally Posted by mlarson View Post
Attachment 201952
2005 build
I usually recommend removal of vapor barrier to let it breathe and dry out completely along with the use of AC and dehumidifier.


Any other views on this issue?
Yes, I agree. I'd definitely recommend to remove it and dry it out, and not reinstall it.


Is this area below ground? With your description I'm thinking not.
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  #5  
Old 5/31/18, 3:25 PM
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Michael Larson Michael Larson is online now
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Default Re: Trapped moisture

Quote:
Originally Posted by ccurrins View Post
Yes, I agree. I'd definitely recommend to remove it and dry it out, and not reinstall it.


Is this area below ground? With your description I'm thinking not.
Its a walk out basement. The areas not exposed had no moisture behind the plastic.

I usually just tell them to remove the plastic or slit it and let it breathe.

The sad thing is that the vapor barrier was required when built. I've seen too many with rotted OSB as a result.



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  #6  
Old 5/31/18, 6:04 PM
Dennis DiVito Dennis DiVito is online now
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Default Re: Trapped moisture

What would the walls be like if the interior sides were finished with drywall? How would you inspect that with knowing what you described as typical condensation issues in your region?


Just curious

Last edited by ddivito; 5/31/18 at 6:16 PM..
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  #7  
Old 5/31/18, 6:18 PM
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Michael Larson Michael Larson is online now
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Default Re: Trapped moisture

Quote:
Originally Posted by ddivito View Post
What would the walls be like if the interior side were finished with drywall? How would you inspect that with knowing what you described as typical condensation issues in your region?


Just curious
You can't.

It's better if finished but once moisture gets in it's like Hotel California.



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  #8  
Old 5/31/18, 7:21 PM
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Default Re: Trapped moisture

Besides all the rest of the comments... It does need to dry out..Yep!




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  #9  
Old 6/4/18, 11:17 AM
Erik Schmidt Erik Schmidt is online now
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Default Re: Trapped moisture

That's interesting, vapor barrier should be on the warm side, so what side is that in Wisconsin in June and then December? I suppose I would recommend replacing batts with board, easy to do as basement is not finished and is proven to work in new builds.



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  #10  
Old 6/4/18, 4:12 PM
Michael Larson's Avatar
Michael Larson Michael Larson is online now
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Default Re: Trapped moisture

Quote:
Originally Posted by eschmidt View Post
That's interesting, vapor barrier should be on the warm side, so what side is that in Wisconsin in June and then December? I suppose I would recommend replacing batts with board, easy to do as basement is not finished and is proven to work in new builds.
That's how it's done on more recent builds.



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You own your private information. I won't sell or give away yours, others do


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Hudson, WI

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  #11  
Old 6/4/18, 10:23 PM
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James E. Braun, CMI James E. Braun, CMI is offline
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Default Re: Trapped moisture

Get rid of the vapor barrier, so the moisture can more through the wall. In Missouri, we are starting not to put vapor barriers on the inside because of that reason.



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  #12  
Old 6/4/18, 10:43 PM
Michael Larson's Avatar
Michael Larson Michael Larson is online now
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Default Re: Trapped moisture

Quote:
Originally Posted by jbraun View Post
Get rid of the vapor barrier, so the moisture can more through the wall. In Missouri, we are starting not to put vapor barriers on the inside because of that reason.
That was my recommendation.



As a Professional Home Inspector, I support the privacy of my clients.

You own your private information. I won't sell or give away yours, others do


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www.MinnesotaHomeInspector.biz

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Hudson, WI

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  #13  
Old 7/17/18, 3:05 AM
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Kenton Shepard, CMI Kenton Shepard, CMI is online now
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Default Re: Trapped moisture

I'm confused.

So, moist air from the interior moves outward toward the exterior through the insulation and OSB and then meets the vapor barrier which is cooler than the interior because it is colder outside than inside? That's why warm, moist air is condensing on the membrane? Because it's colder outside?

The housewrap is the vapor barrier you're referring to... right? why do we see plastic on the interior of the wall with wet insulation behind it? You said the vapor barrier was between the siding and the OSB ext. wall sheathing, so it shouldn't be visible. I'm totally lost here.



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  #14  
Old 7/17/18, 7:54 AM
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ROBERT YOUNG ROBERT YOUNG is offline
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Default Re: Trapped moisture

So very sorry, Michael.
After reading your post,

2005 build
Walk out basement
Poured foundation
House wrap behind vinyl siding over OSB
Unfinished basement walls
Trapped moisture behind vapor barrier on all but poured foundation portions.
Fiberglass batt insulation.
OSB not affected yet where checked
Minor organic growth. No odors.


the image appeared to me to be efflorescence on concrete. Damn. My eyes are going. So sorry.

Kenton brought me back to the thread with his reply and I concur.

If you could, or feel like it, could you describe the wall assembly once more please. Looking forward to your answer.



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  #15  
Old 7/17/18, 8:10 AM
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ROBERT YOUNG ROBERT YOUNG is offline
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Default Re: Trapped moisture

2005 build

Walk out basement
Poured foundation
Requires anti damp at the very least.
House wrap behind vinyl siding over OSB. House wrap should be of a Vapor Diffusion Retarder type.

Unfinished basement walls
Trapped moisture behind vapor barrier on all but poured foundation portions
. The interior Vapour Barrier. thin mill plastic, is leading to an increase in moisture related problems. Remove the plastic vapour barrier.

Fiberglass batt insulation. No issue when there is circulation.
OSB not affected yet where checked. Good.
Minor organic growth
. No odors. Microbial growth can/may be a concern.


Remove the plastic vapour barrier.



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Montreal Home Inspection Services Inc.
Home Inspections & Building Inspection Services. Covering on and off islands in greater Montreal and Laval. (514) 489-1887 or (514) 441-3732.
Our Motto: Putting Information Where You Need It Most, "In Your Hands."
https://montreal-home-inspection-services.com

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