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Styrofoam Insulation Sheets

 
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Old 10-11-2014, 04:26 PM   #1
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Styrofoam Insulation Sheets


I have a friend who lives in Brandermille, VA. She had no problems with her house until she had vinyle siding installed. Now her front door sticks during the summer and her hard wood floor which I installed is buckling. She seems to think it may be the sheets of insulation that was installed under the siding. I also am leaning towards that conclusion because there was no problems prior.

Does anyone here think that the insulation may not be allowing the house to breath and trapping moisture in the house? If so I was going to remove it and replace with Tyvek.

I noticed too that there are a lot of trees around, but they can not be cut as the home owner association will not permit it. There is massive amount of mildew on the side of the house too.
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Last edited by Bill; 10-11-2014 at 04:38 PM.
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Old 10-11-2014, 04:46 PM   #2
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Re: Styrofoam Insulation Sheets


Sounds like the guys who installed the vinyl and the styrofoam tightened up the house quite a bit. And now it's not breathing. Newer homes have systems that allow the house to breathe.

Sounds like the house is having a tightness issue.

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Old 10-11-2014, 05:05 PM   #3
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Re: Styrofoam Insulation Sheets


Get a dehumidifier
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Old 10-11-2014, 05:19 PM   #4
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Re: Styrofoam Insulation Sheets


Just a couple thoughts.
Is the roof vented properly?
Did she have new windows put in too?
Does she run air in the summer or leave windows open most of the time?
I agree.Sounds like they sealed it up tight.
As a side note:I live in IL and most of the houses we build around here have a sheet of OSB to stiffen/square the corners and Tuff-r covering the rest.A very big percentage are vinyl over foil backed foam.

Last edited by mako1; 10-11-2014 at 05:24 PM.
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Old 10-11-2014, 05:23 PM   #5
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Re: Styrofoam Insulation Sheets


Moisture is supposed to stay in the inside in cold climates. Your Area is neutra , I think. What kind of heat?
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Old 10-11-2014, 05:24 PM   #6
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Re: Styrofoam Insulation Sheets


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Just a couple thoughts.
Is the roof vented properly?
Did she have new windows put in too?
Does she run air in the summer or leave windows open most of the time?
I agree.Sounds like they sealed it up tight.
Roof has gable end vents, though I prefer ridge vents myself.
Yes she had new windows installed just before the siding was installed. Pella replacement windows
She runs AC
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Old 10-11-2014, 05:25 PM   #7
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Re: Styrofoam Insulation Sheets


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Moisture is supposed to stay in the inside in cold climates. Your Area is neutra , I think. What kind of heat?
AC / heat pump
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Old 10-11-2014, 05:53 PM   #8
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Re: Styrofoam Insulation Sheets


Is the house on a slab? The dehumidifier idea sounds solid.
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Old 10-11-2014, 05:57 PM   #9
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Re: Styrofoam Insulation Sheets


Quote:
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Roof has gable end vents, though I prefer ridge vents myself.
Yes she had new windows installed just before the siding was installed. Pella replacement windows
She runs AC
Is the soffit vented ?Gable end or ridge vents take air out.You need some place to bring air in that is being removed.Such as vented soffits and ridge vents.Your roof acts just like a chimney.Almost.
Sounds like there is a lot of moisture staying in the house with no way to get out.A de humidifier would help but IMO the best thing to do is fix the house.
It was not the foil backed foam causing this problem.All you did was add a little insulation.

Last edited by mako1; 10-11-2014 at 06:00 PM.
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Old 10-11-2014, 06:16 PM   #10
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Re: Styrofoam Insulation Sheets


It's not complicated.

Air exchanger and dehumidifier.
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Old 10-11-2014, 07:26 PM   #11
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Re: Styrofoam Insulation Sheets


With the new insulation, the AC is now oversized for the load, so it's short cycling and NOT getting humidity out of the air...
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Old 10-11-2014, 10:01 PM   #12
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Re: Styrofoam Insulation Sheets


What humidity levels are you looking at?

I have a hygrometer in the basement and on the main floor and I'm looking at 69 degrees temperature and 50% humidity now. As winter comes, I'll start running the humidifier on the furnace and I'll aim for 50%. I can make it rain inside if I want. The windows will start to condensate and the ceiling as well.

I know a guy who had water dripping down the underside of his roof and into the soffit, where it continued down against the side of the house.

Anyway, I deal in facts. What is the humidity level in the home?
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Old 10-12-2014, 06:00 AM   #13
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Re: Styrofoam Insulation Sheets


Check out every opening for proper rain cap installations....

How did they add foam and not retrim the windows/doors?

gutters rehung/working. shower vented/run, kitchen vent/used?

foam could be causing vapour to condense on wrong side of vapor barrier(s), house could have Two vapor barriers now from faulty install of siding/foaam.........
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Old 10-12-2014, 10:44 AM   #14
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Re: Styrofoam Insulation Sheets


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Check out every opening for proper rain cap installations....

How did they add foam and not retrim the windows/doors?

gutters rehung/working. shower vented/run, kitchen vent/used?

foam could be causing vapour to condense on wrong side of vapor barrier(s), house could have Two vapor barriers now from faulty install of siding/foaam.........
how does 2 vapor barriers constitute ''faulty install of siding/foam''?
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Old 10-12-2014, 11:32 AM   #15
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Re: Styrofoam Insulation Sheets


Because 2 vapor barriers trap the moisture between them. And that will lead to all kinds of moisture problems.
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Old 10-12-2014, 02:24 PM   #16
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Re: Styrofoam Insulation Sheets


well...a yea,but that is not a faulty installation,and can reduce condensation in the wall cavity
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Old 10-12-2014, 04:07 PM   #17
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Re: Styrofoam Insulation Sheets


You need a little remedial building science.

Entropy increases--ALWAYS.

Heat flows to cold, Moisture is literally sucked to dryer spaces.

Creating walls that has many types of materials in random order can lead to moisture condensing out inside the "rain wall" of the building.

Would you want areas of stagnant moisture/water slowly leaking into your living spaces?-- storing water between two layers of Vapour barrier, under many conditions the vapour passes the original barrier, then condenses INSIDE the new impervious to liquid water Vapour barrier..... Oooops.

If you wear Gore Tex boots inside of waterproof galoshes, the moisture will collect in the rubbers from cooling off, and be trapped.

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Old 10-12-2014, 05:27 PM   #18
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Re: Styrofoam Insulation Sheets


keeping the sheathing warmer increases condensation how?You don't even know what type of foam or if there is actually 2 vapor barriers..

you need some remedial question asking
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Old 10-12-2014, 06:01 PM   #19
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Re: Styrofoam Insulation Sheets


Quote:
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keeping the sheathing warmer increases condensation how?You don't even know what type of foam or if there is actually 2 vapor barriers.. you need some remedial question asking
No he's 4th gen. He knows exactly what's going on in every situation before the question is asked.
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Old 10-12-2014, 06:02 PM   #20
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Re: Styrofoam Insulation Sheets


ah..

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