I need to insulate a vaulted ceiling. I understand I can't put the
insulation right against the plywood. (it would get too hot).?
I bought some vent channels, they go between the rafters against the plywood
only thing... how can I vent these when my roof ties in flat (just a lean 2
style room addition)
any ideas are appreciated
the roof is a 2/12 pitch
Not sure what you mean by "ties in flat". If it butts into a wall,
then you can use a ridge vent such as cobra right up against the
wall. it will have to be covered with flashing somehow. If it's new
construction, you might be able to leave an airspace behind your
siding and then vent the soffit above. The other option I would
consider is no venting at all--but you would need to either use spray
in foam or dense pack cellulose with a very good vapor barrier. If
you have a building inspector involved, you better call him and see
what he says.
sorry, I mean to say, the new roof has been set squarely into the existing
MY rafters were set to the layout of the existing house rafters.
and my roof is pitched @ 2/12
looking at my roof from a helicopter, you just see a rectangle.
there are no valleys or ridges...
and this style of insulation won't catch on fire against the asphalt
Is the existing roof ventilated? If so, perhaps you can drill some
holes in the sheathing of the old roof just below where the new roof
ties in, to allow the air from the lower roof to pass upward.
Alternatively, if there is an attic space, you could add some can
Using foam creates a "hot roof". No, it won't catch fire. But if you
are in a warm climate, it may not be appropriate.
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