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Posted by No on July 15, 2005, 10:52 am
I think you will be fighting a loosing battle. You need to keep the
underside of the roof the same temp as outside to avoid ice dams and
condensation on nail tips.
To properly solve the problem you will need to add ventilation at ridge and
soffit, build a small attic and insulate.
Your "attic" only needs to be a couple of inches high. Your ceiling could be
decorative and made to look like rafters and sheathing.
You could also build you attic on top of your existing roof if structure
would accommodate it.
>
> The guy who owned my house before me did a very nice looking renovation
> in my living room. He took out the attic leaving a high cathedral
> ceiling with the rafters and planks of wood visible. It looks like a ski
> lodge. I think they're calling these houses "bungalofts" now or something.
>
> There is no insulation. There are no roof or soffit vents.
>
> It's a little rough keeping the room comfortable in winter, but with a
> ceiling fan and a small space heater I get by.
>
> In summer with the central AC it's also tough to keep the room cool, but
> so far so good.
>
> The main problem in summer is condensation. There is one small area on
> my ceiling that drips water onto my floor (not much, but enough to be a
> problem) but only when the sun is high/hot and the AC is on, especially
> on the more humid days. The water seems to form around some of the
> exposed nails/screws (probably holding down the shingles from outside)
> in the ceiling.
>
> The water is usually dark and oily looking which makes me wonder if it
> really is condensation. It might be that water somehow gets under the
> shingles when it rains but it doesn't get into the house until the sun
> heats up the roof. But for now I'm working under the assumption that
> it's just condensation. [Although, the last few days have been unusually
> hot and humid and there has been no water dripping at all.]
>
> So...If I had a vent on my roof the extreme hot air could escape in
> summer, probably reducing or eliminating my condensation problem. But in
> winter this vent would need to be closed.
>
> Does anybody out there know of a roof vent that can be opened in summer
> yet switched off in winter?
>
> [I've got some problems with ice dams and water getting into the house
> (in a different area of that ceiling, 2 areas actally) in winter too,
> but that's for another thread I guess. Looks like I'll have a layer of
> ice and water shield installed and maybe some heating cables on the roof.]
>
> Nice looking reno...everybody loves the way my house looks, but a pain
> in the ass.
>
> Any thoughts, tips, advice, etc. appreciated.
>
> --
> Joey Goldstein
> http://www.joeygoldstein.com
> joegold AT sympatico DOT ca
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