I need some advice on insulating an older home. I’m going to re-side the house and want to know if I should cover the house with insulated sheathing or simply seal it with a building wrap.
It was built in 1935. Wall construction is 2×4’s with plaster/lath on the interior and 3/4″ shiplap sheathing (no vapor barrier). walls have rock wool. Attic has 11″ of fiberglass (that’s the max I can put in) and the basement is uninsulated/unheated.
All the windows have been replaced with Andersen windows with insulating glass.
All doors have been upgraded as well.
So, is it worth the money to add 3/4″ foil faced insulation or should I just seal the house with Tyvek… Perhaps the real question is what is the cause of most heat lose thru the walls… conducted loss or air infiltration.
I’ll likely insulate the basement ceiling.