I'm re-insulating an interior wall & putting up drywall to replace the old plaster walls. Rather than screwing the drywall directly into the studs, I'm toying with the idea of putting a 1/2 inch of polystyrene rigid insulation along the stud, to prevent thermal bridging. I would then put up the drywall with longer screws that would go through the poly, and dig into the studs.
Is this a bad idea? Will this cause problems either during installation of the drywall or days/months/years after installation?
Best Answer
It's common to do the reverse...clad the outside in foam insulation to prevent thermal bridging from that side.
Your idea is sound. I'd suggest using full panels and then tape them. That would add additional insulation to the entire wall and also act as a Vapor barrier for you.
Another technique is instead of using insulation, install 1x2" slats horizontally across the studs every 16" and install the sheetrock to that. The theory is the same in that the only bridging would then be and the small points where the two pieces of lumber meet.