Is There A Way To Check For Moisture? - Insulation - Contractor Talk

Is There A Way To Check For Moisture?

 
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Old 07-06-2020, 08:33 PM   #1
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Is There A Way To Check For Moisture?


Hi all so I built finished my house about 6 months ago and been living here for maybe 4 months. While building u asked alot of questions here about spray foam thermal bridging etc. So is there a way to actually check for moisture issues to make sure we did it right

My set up is as follows

old true dimension 2x4 framed exterior walls filled with closed cell phone roughly 3.75

Basement foundation walls coated with 3 inches of closed cell ontop of foundation

On the exterior I have 1/2 foam and housewrap the siding guys put up

And the roof rafters filled about 7-8 inches of open cell does anyone see a problem with moisture mold etc and how can I tell?


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Old 07-06-2020, 08:44 PM   #2
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Re: Is There A Way To Check For Moisture?


Get a moisture meter...

You could also do a variation of the old visqueen test...

Tape a 12" sq of visqueen on what ever surface you have and see what happens...

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Old 07-06-2020, 09:25 PM   #3
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Re: Is There A Way To Check For Moisture?


I'm assuming outside the house?

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Old 07-06-2020, 10:23 PM   #4
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Re: Is There A Way To Check For Moisture?


Quote:
Originally Posted by nickelec View Post
I'm assuming outside the house?

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where outside the house?

are you talking about ground water?
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Old 07-06-2020, 10:23 PM   #5
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Re: Is There A Way To Check For Moisture?


I was referring to the thermal brake

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Old 07-06-2020, 10:24 PM   #6
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Re: Is There A Way To Check For Moisture?


Thermal break

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Old 07-06-2020, 10:25 PM   #7
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Re: Is There A Way To Check For Moisture?


i still don't get what you are trying to do.
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Old 07-06-2020, 10:29 PM   #8
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Re: Is There A Way To Check For Moisture?


From my understanding and correct me if I'm wrong, but from the reading I have done I understand that if there's not enough insulation or a significant thermal break between inside and outside , the cold air in the summer escaping the building to the outside hot air could cause condensation build up . Against the sheeting

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Old 07-07-2020, 05:56 AM   #9
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Re: Is There A Way To Check For Moisture?


You have that backwards - hot moist air condensing against cold walls on the inside
During wintertime it is reversed to what you said
Best test is blower door with infrared - no air leaks no air flow for condensation issues

With Open cell in attic - good chance of issues (don't care which climate zone), just put a humidity meter up there which tracks it. Expect spikes during mid day - how bad can clue you in to if you need to worry or watch

Only other issue can be moisture sandwich - two layers of foam on sheathing. Siding guys did it right, generally no problems. Reverse laps, etc... you can have big issues but hey that applies to all jobs (with or without exterior foam) & no real test for that. Might get lucky with infrared but...
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Old 07-08-2020, 03:12 PM   #10
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Re: Is There A Way To Check For Moisture?


This sounds like a GBA forum question... www.greenbuildingadvisor.com There's a lot of building science guys who love to get into exactly this kind of question over there.

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