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Posted by marson on June 21, 2007, 7:19 pm
> > Not sure what you mean by "ties in flat".
>
> sorry, I mean to say, the new roof has been set squarely into the existing
> one.
> 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...
>
> >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.
>
> and this style of insulation won't catch on fire against the asphalt
> shingles?
>
> Thanks
>
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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
vents.
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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