Over Insulating A House

Larry_10

part of my house was made in the early 50's and was a prefab house so it's 2x4's were put sideways when they built it so the exterior walls are 2 inches and I have single pain windows on one side I have 2x6 construction on my new side of the house.

I was wondering what you all though of this I want to put 2x4 inside. so it will be like a 2x6 house 31/2 plus 2 inch
is 5 1/2 so that will be like a 2x6 house then add r15 insulation pulse 6mil plastic and new double pain Anderson windows. I was wondering is 6mil plastic over kill

I will put in a heat recovery ventilator and put it on a timer because my duct work and air handler is just for a/c

this will bring in fresh air into the house and let out bad stail air

will this be ok or do you think I will have moister problems inside the walls I live in Connecticut now I know this may bring down my heatload. I have a buderus g115-28 and I will add the 2107 controller in a few weeks so I should be ok incase of short cycle

here is a picture of my house

thanks for any input

Larry Weingarten

Personally, I'd skip the poly...

...as it can cause rotten problems. Have a look at this site for good info. http://www.buildingscience.com/

Yours, Larry

Fred Harwood

Poly

Yes, add the poly on the inside just underneath the drywall, and pay attention to how inside air might get to inside the wall. Don't seal the outside, so that the small amount of moisture that gets into the wall can keep on going. Think dew point, somewhere in that wall, on a cold, windy day like this one (Mass.), and ensure that very little gets into the wall. The only way to keep it out is to use poly inside and don't let inside air get into the wall.