Billbill84
Well-Known Member
Hi guys. Please check out my pics and the blueprint sketch of my house below. I'll provide illustration to help readers understand my setup.
The problem: cold closet and next to a freezing bathroom that had the tub drain freeze last season. Both areas are constructed above a non-heated but insulated finished garage.
What I've found: area above garage is semi finished insulated and 3/4" plywood down for storage purposes. It's all plywood and only spot with possible cold draft is at end of rafter tails near soffits so I stuffed a bunch of R30 in two of the tail ends. Still nasty cold and somehow air still wisking in or maybe it's all just due to the way it's constructed but not sure, that's why I'm here lol! Second is design flaw due to design of my HVAC system, more on that later.
*The first pic is a blueprint of my house, blue is garage and red is area that's built over garage and orange is area in question (cold bathroom and closet)
*Second is actual pic of area bottom view of closet and bathroom that's built over cold garage.
*Third is a mock up of how I added insulation in ends of joists that were in line with boxed in area over garage that is cold
*Next two are pics of outside view behind vinyl siding is the bathroom and closet areas.
*Finally last pic is of my HVAC system that feeds the second level that has the freezing bathroom. It runs through the 2nd level subfloor. It's generally always cold up there in winter but that fact that the bathroom floor and tub are so cold, actually the whole floor really carpet and all, is cold!! All my supplies and returns are in the ceiling and top of walls with the main floor having them supplies in the floor makes me think my second level subfloor is cold because there's no radiant heat in it. It's not being heated because of the distance between the main floor registers and the second level ceiling registers. The cold subfloor could be a symptom of another issue that's also to blame for the freezing bathroom!
Why is this bathroom so damn cold that my tub drain froze. The entire subfloor is so cold in winter! Any ideas on how I can fix this drafty second level subfloor! Maybe air leakage from the garage?? I'm confused
The problem: cold closet and next to a freezing bathroom that had the tub drain freeze last season. Both areas are constructed above a non-heated but insulated finished garage.
What I've found: area above garage is semi finished insulated and 3/4" plywood down for storage purposes. It's all plywood and only spot with possible cold draft is at end of rafter tails near soffits so I stuffed a bunch of R30 in two of the tail ends. Still nasty cold and somehow air still wisking in or maybe it's all just due to the way it's constructed but not sure, that's why I'm here lol! Second is design flaw due to design of my HVAC system, more on that later.
*The first pic is a blueprint of my house, blue is garage and red is area that's built over garage and orange is area in question (cold bathroom and closet)
*Second is actual pic of area bottom view of closet and bathroom that's built over cold garage.
*Third is a mock up of how I added insulation in ends of joists that were in line with boxed in area over garage that is cold
*Next two are pics of outside view behind vinyl siding is the bathroom and closet areas.
*Finally last pic is of my HVAC system that feeds the second level that has the freezing bathroom. It runs through the 2nd level subfloor. It's generally always cold up there in winter but that fact that the bathroom floor and tub are so cold, actually the whole floor really carpet and all, is cold!! All my supplies and returns are in the ceiling and top of walls with the main floor having them supplies in the floor makes me think my second level subfloor is cold because there's no radiant heat in it. It's not being heated because of the distance between the main floor registers and the second level ceiling registers. The cold subfloor could be a symptom of another issue that's also to blame for the freezing bathroom!
Why is this bathroom so damn cold that my tub drain froze. The entire subfloor is so cold in winter! Any ideas on how I can fix this drafty second level subfloor! Maybe air leakage from the garage?? I'm confused
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