Hi, I'm having an issue with my new house, and I'm doing some research to make sure the builder isn't just going to put a bandaid on the problem.
During a recent snow storm which included some decent south winds my wife and I noticed a draft in the 2nd floor master bathroom, coming from below the baseboard on the north facing exterior wall. we didn't feel any draft in the master bedroom which shares the same exterior wall. The next morning we also noticed that the tile floor in the master bathroom was SUPER cold, we even compared it to the other two rooms upstairs that have tile, and it was very noticeable.
I have a large doghouse/kick-out on the first floor that houses a gas fireplace, and a TV nook. This is directly below the master bath, and the roof of this structure ends up being just above floor height for the second floor. The soffit on this small roof is vented, which worries me, as there is no top vent
I poked and prodded around that morning, and found that the interior side walls of the TV nook were also ICE cold, as was the small beam over the nook. The bottom, top and back were cool to the touch. All surfaces that are part of the kick-out were cooler than the house's exterior walls. Also noticed some draft coming out of the electrical sockets in the nook and the two a/v wiring boxes as well.
Image of it when just drywalled. Unfortunately it's done now, so work will be harder.
What would be the correct way/s to have this doghouse insulated? Where should there be vapor/moisture barrier? How should the roof of this thing be sealed? and are there any other things I should look for as we dig into getting this repaired?
Here is an interior picture before the drywall or insulation