We have just built a new screen porch. I am in the process of insulating
the walls so next few years I can replace all the screen windows with true
storm windows. But this is the problem I am running into, I want to prevent
the water from running down the inside of the wall and getting the rigid
foam insulation wet. Also if I vent the bottom of the wall where the tongue
and groove is going on the interior walls will this prevent mold from
growing inside the wall cavities? Or I am going to get mold even without
A guy at Owens-Corning 1-800-get-pink told me not to insulate an unheated
and uncooled space like a garage, and maybe like your porch, because natural
"breathing" is hindered and the room stays uncomfortable and possibly
stinky/moldy. Normal walls are not vented. Existing techniques are tried and
true, and I don't think you should invent a new method of building.
I have my garage insulated so that I can run a heater in the winter when I
want to. It doesn't get that musty because the doors are open often
Still, in this guy's situation it sounds like he knows he's going to have
moisture so he should probably not insulate or even close up the walls
until the moisture source is blockable.
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