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Old 02-12-2014, 05:09 PM   #16
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Damp drywall due to improper vapor barrier install?


You are in Canada and they put stucco on....What is behind the stucco?

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Old 02-14-2014, 08:12 PM   #17
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Damp drywall due to improper vapor barrier install?


So after some more poking around the drywall (freshly painted) came off. The moisture was due to poor vapor barrier and insulation. What I found was not promising (it could have been a lot worse though).
The vapor barrier is/was 2mil secured with maybe a dozen staples along the top and loosely draped down. The electrical box was not sealed in any way, just a big gaping hole around it an the wall between the studs was covered in frost. I then tore out the drywall in the closet (also freshly painted) and discovered more of the same. I now have all the drywall, insulation, and vapor barrier on that wall removed and a handfull of lamps and fan going to dry it out.

I did a home depot run earlier today and bought some Roxul R14 insualtion batts, some more sheathing tape, some 6 mil poly, and some other random stuff. With any luck itll be dry enough tonight to re insulate, and tomorrow I can tear out the other wall and do the same.

Next week/weekend Ill be tearing down the master bedroom walls and doing the same. There will be just as bad if not worse.
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Old 02-15-2014, 07:26 PM   #18
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Damp drywall due to improper vapor barrier install?


So I purchased a moisture meter and tested various areas of the wall. It ranged anywhere from 9% -17% (23 was the highest but the wood was still visibly moist). I also gave the walls a quick misting of anti mold spray (http://www.homedepot.ca/product/946-...-bottle/949056) for good measure. I also have a few fans and a dehumidifier running as well.

At what moisture level should I be safe to start re insulating the walls? Only smalls sections are reading 17% and higher.
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Old 02-16-2014, 12:42 AM   #19
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Damp drywall due to improper vapor barrier install?


I think you are ready to go. The wall will be drying to the outside anyway.
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Old 02-16-2014, 10:35 AM   #20
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Damp drywall due to improper vapor barrier install?


Caulk and sealant are your friend here.

Airtight Drywall Approach (ADA).
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Old 02-18-2014, 02:05 PM   #21
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Damp drywall due to improper vapor barrier install?


First room is re-insulated and almost vapor barrier-ed. I ran out of sealant last night, I went a wee bit excessive on one wall. Started ripping the walls out of the master bedroom to check for moisture and luckily there was little to nothing. Theres were signs of dripping condensation on the wall. Aslo, this is how the outlets were "sealed".
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Old 02-18-2014, 05:52 PM   #22
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Damp drywall due to improper vapor barrier install?


Heres one wall. And, with all the excess sealant on the studs the drywall screw should be sealed as well.
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Old 02-18-2014, 07:05 PM   #23
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Damp drywall due to improper vapor barrier install?


Seal behind the outlet plates.

Google "putty pads"
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Old 02-18-2014, 07:48 PM   #24
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Damp drywall due to improper vapor barrier install?


If you don't stop the moisture before the insulation you will get a greenhouse effect and the condensation will build on the inside of your vapor barrier and all you are doing will have little effect.
I am trying to wrap my head around the fact you stucco on your walls in Canada...
Stucco is neither moisture proof or vapor proof.
This was proven when they tried to use stucco in high humidity geographical areas.
It sounds to me like the problem is behind the stucco.
What is your average humidity ?
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Old 02-19-2014, 12:23 AM   #25
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Damp drywall due to improper vapor barrier install?


Quote:
Originally Posted by 26yrsinflooring View Post
If you don't stop the moisture before the insulation you will get a greenhouse effect and the condensation will build on the inside of your vapor barrier and all you are doing will have little effect.
I am trying to wrap my head around the fact you stucco on your walls in Canada...
Stucco is neither moisture proof or vapor proof.
This was proven when they tried to use stucco in high humidity geographical areas.
It sounds to me like the problem is behind the stucco.
What is your average humidity ?
Im pretty sure the frost build up on the inside was just due to warm air condensing. The vapor barrier was extremely poorly done and the insulation averaged maybe 2 inches thick and was compressed in a lot of places. If my new stuff is R14 I would guess that the old stuff maybe rated R7. Some of the new vapor barrier and insulation has been up for about a day and there's no sign of moisture/frost on the inside or the outside.

Behind the stucco is most likely a layer or 2 of tar paper then plywood (which is where I had frost). The house is 47 years old and the stucco is doing pretty good, a few cracks here and there but nothing major.

The Relative Humidity averages 50% -75%
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Old 02-19-2014, 07:28 AM   #26
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Damp drywall due to improper vapor barrier install?


Back in 1992 I did a lot of work for a casino riverboat in Lake Charles Louisiana.
They had these large buildings built on barges and they had brought their west coast ideas and stuccoed everything.
The stucco could not take the moisture and relative humidity of the Deep South, about 89%.

It could not take the rain either,within a few short months they had severe moisture problems. They then started claiming they had intended it to be temporary anyway.

I am looking at this on the opposite side of the spectrum, you have such extreme cold and your humidity is high compared to where stucco is so prominent , the west, and in my home state Arizona.
I just don't see how that stucco has held up for so many years.
I had a builder uncle that used to laugh about installing stucco, he was from the northwest and he said stucco would never last in Washington state, the reason he was laughing is his exterior finish cost were cut in half by using stucco in Arizona as compared to WA requirements.

I don't think your problem is solved, I hope what you do works but I fear the cold in the form of frost will keep condensing into the warm spot close to your drywall.
We call plastic sheeting a moisture blocker but it is not a a vapor barrier.
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Old 02-19-2014, 07:48 AM   #27
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Damp drywall due to improper vapor barrier install?


Not sure I agree I live in Fla. not far from the Gulf and believe me we know about humidity and probably 95% of the homes here are stuccoed and we don't have have the problems you mentioned. When I lived in Ohio we had stuccoed houses although not near as many as down here.
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Old 02-19-2014, 08:52 AM   #28
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Damp drywall due to improper vapor barrier install?


I know they have made improvements in stucco but not 47 year old stucco.

I would be curious to see what the walls behind the drywall looked like in your house. I assume if the proper vapor barriers are used or if you put stucco over block.... As many houses in Florida are you will not have problems.
However this fellow is' having problems so getting to the core of the issue is key.
Frost and moisture is getting into his interior walls, you can waterproofing the interior all day long but if you don't solve the moisture saturation coming in , any fix is temporary.

I was doing a flooring job for this Cajun builder that built a hurricane proof house.... Or so he thought, I think Ike took it out.
He had double plywood interior walls and double plywood exterior walls , the finish was brick. They would laugh and joke about how people are using stucco in high humidity areas not realizing that moisture will find a way in, you will not know it for years but one day it will show itself.

Here is another example, in Charleston SC there has been a flurry of lawsuits due to the use of stucco on exterior walls. They have had to shut down townhouse developments built in the 80s because they are rife with mildew.
You can hardly get financing on older town houses due to the fear of potential losses from moisture damage.
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Old 02-19-2014, 08:57 AM   #29
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Damp drywall due to improper vapor barrier install?


Quote:
Originally Posted by Spacemoose View Post
Im pretty sure the frost build up on the inside was just due to warm air condensing. The vapor barrier was extremely poorly done and the insulation averaged maybe 2 inches thick and was compressed in a lot of places. If my new stuff is R14 I would guess that the old stuff maybe rated R7. Some of the new vapor barrier and insulation has been up for about a day and there's no sign of moisture/frost on the inside or the outside.

Behind the stucco is most likely a layer or 2 of tar paper then plywood (which is where I had frost). The house is 47 years old and the stucco is doing pretty good, a few cracks here and there but nothing major.

The Relative Humidity averages 50% -75%
It sounds like you solved the problem. The poor insulation was causing cold spots on the back of the drywall which was causing condensation to form on the wallboard. A good insulation job will not allow a cold air spot to form behind the wallboard. The vapor barrier will prevent the moist air from permeating thru to the insulation where it will saturate it and help cause cold spots. Wet insulation is not a good insulator and will conduct cold to the inside. Nice job on the repairs
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Old 02-19-2014, 09:10 AM   #30
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Damp drywall due to improper vapor barrier install?


Quote:
Originally Posted by danpik
It sounds like you solved the problem. The poor insulation was causing cold spots on the back of the drywall which was causing condensation to form on the wallboard. A good insulation job will not allow a cold air spot to form behind the wallboard. The vapor barrier will prevent the moist air from permeating thru to the insulation where it will saturate it and help cause cold spots. Wet insulation is not a good insulator and will conduct cold to the inside. Nice job on the repairs
It certainly looks well done from the pictures but I am a little uncertain about a few things: the vapor barrier is on the outside (inside of house) of the insulation how will that prevent moisture from getting to the insulation?
That would indicate the moisture is coming from the inside of the house.
If the air flow is coming from the outside of the house due to the proof of frost on the plywood how does that prevent moisture from building in the insulation since it is between the plywood and interior vapor barrier?
Perhaps I misunderstood you.

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