This 1990 house has 4 bedrooms, all upstairs. Only the one above the
carport is noticeably hotter than the others. I think the most
important reason is that the underside is outdoor instead of indoor
(living room, kitchen etc). I asked other people whose houses have a
bedroom above the garage. They all say that bedroom is quite hot in
summer. Now I'm thinking of having a contractor remove the sheetrock
above the car port (i.e. below the floor of this bedroom). Unless
there's already insulation (I would be very surprised!), I'll have
them add good insulation materials to it. Hopefully they're good
enough to put the sheetrock back as if nothing has happened. What do
you all think? Thanks.
I may also have the carpet in the room changed to wood floor. So doing
it from above (in the bedroom) can be considered too. But I think
that's more work than doing it from under.
The very best gold-plated solution is to take down the sheetrock (hard
to salvage, get rid of it) and call in a contractor to spray foam it.
Icycynene and similar are the highest R value per inch in most places..
Nobody else said it, so I will- highly unlikely that the carport ceiling
is sheetrock, aka drywall. Most likely plywood or OSB, maybe one of
those plastic-coated OSB things.
Carport= no walls and no weather protection, IOW a damp location. I'm
not even a fan of drywall in garages, much less anywhere the rain can
blow in anytime it wants.
Thanks to everyone. I removed the ceiling light holder under the car
port and peeked up through the hole. There doesn't seem to be
insulation, at least around where the light is installed. A contractor
told me it will make more sense to improve attic ventilation than do
anything to the car port. Now I ask myself, Why did I never hear
anybody talk about insulation under the floor of the bedroom above car
port or garage? If this idea sounds weird and nobody does it, there
may be a reason. Making attic breathe better is of course good. I may
do that first.
(Sorry for this late reply. I use Google Groups. It stopped working a
few days ago.)
if there truly is no insulation under the floor above the car port, find a
different contractor. there is most likely insulation above the ceiling in
that room. with none under, it will ALWAYS be cold in the winter, hot in the
summer, and the problem isn't the ceiling.
I agree that there should be insualtion in the carport ceiling, but I
going to solve a heat problem in the summer, unless it's someplace
typically 110F+. If a more typical hot day is 80 or 85, I'd say
going to lose that much cooling through that uninsulated floor/ceiling
interface. A 10 deg temp difference just isn't great enough to make
big difference. If in the winter there can be a 50F delta, then I'd
you have a bigger problem.
On the other hand if the attic is 120F and there were no insulation
that would be a problem. I also would make sure the attic is
properly ventilated, which is very important and not only for heat
I'd investigate how the ducts are run, the length, adequacy, returns,
IT's not unusual to have one room be a problem just because it's at
end of a long duct run, ducts that were too small were used,
returns, etc. And that kind of situation could easily be found in a
over a carport, unless the HVAC is in the attic. Such a location
how you can run ducts to it. Also, obviously if the room faces south,
that could be a factor as well.
Not saying that ceiling shouldn't be insulated. It should be. Just
I'd investigate a lot more before I spent money fixing something that
may not provide much difference.
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