Damp Drywall Due To Improper Vapor Barrier Install? - General DIY Discussions - Page 3 - DIY Chatroom Home Improvement Forum
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Old 02-19-2014, 03:17 PM   #31
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The previously posted pictures show the plywood of the exterior wall. The warm air inside the house is quite a bit more humid then the cold air outside (even though the outside relitive humidity might be more, cold air holds less water). If I remember my grade school science correctly its like saying a large cup filled 50% of the way still holds more water then a small cup thats 90% filled.
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Old 02-19-2014, 04:45 PM   #32
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Quote:
Originally Posted by 26yrsinflooring View Post
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.
So, where should the vapor barrier be?
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Old 02-19-2014, 07:35 PM   #33
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Well it is clear the owner of the problem has addressed it the best that an be done short of removing the stucco , which is not an option.

I am only a flooring and shower guy so blocking moisture and containing and redirecting water is a large part of my job. I am not a builder so the rules I will use will be different than a builders.
For proper moisture blocking you want a water and vapor proof barriers directly behind exterior layer that is being impacted by the moisture.

So in retrospect the moisture barrier should be on the outside of the plywood and installed with a non invasive procedure.
Tarpaper is not exactly the best method but it is acceptable if install properly, it normally is not installed in manner that will allow to be used to its full potential.
The seams are not taped and quite possibly are not overlapped correctly. Then the lathe is applied to accept the stucco, the application of the lathe compromises the whole aspect of installing a moisture barrier like tarpaper as it now become a pincushion with several hundred nails or staples hammered into it.

I can take short cuts in a shower although I choose not to, there are many short cuts with flooring and you can achieve an equal or even superior job.
There are no shortcuts when you are building walls on exterior houses in northern latitudes.
.... Now I mean there are shortcuts that can be taken but they will expose themselves in short time.
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Old 02-19-2014, 07:42 PM   #34
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I must say Mike Holmes has no problem with digging out from the foundations of the basements and applying the moisture barriers in the form of tar directly to the brick.
I applaud this method it is done correctly.
I find him to be a bit overbearing on some issues, well versed on many things and not so well versed on flooring and shower applications.
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