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Posted by Jimbo on October 15, 2008, 2:16 pm
> Jimbo wrote:
> > Most of my house (located in Toronto, Canada) has a flat roof with a
> > reasonable run off. =A0It was built in the 20's and the roof is BUR wit=
h
> > various layers added over the years. =A0Some recent damage got me
> > looking at the roof in preparation for winter. =A0When I peeled back th=
e
> > membrane (looked like old ungranulated torch on), I noticed all the
> > fiber board (cover up) boards were soaking wet. =A0My question: is it
> > worthwhile taking off all the wet fibreboard and replacing it with 1
> > or 2" polyiso and then recovering? =A0Or should I just replace the
> > fibreboard and recover with granulated torch on or roll on?
>
> How much, if any, insulation is on the underside of the roof? =A0I'd do
> whatever it took to get to at least a minimum recommended R value for
> your climate.
>
> Obviously, anything that's currently wet needs replacing at minimum and
> if there's wet where you've looked there's good chance there's damage
> under that to be repaired as well.
>
> --
The membrane is alligatored, the cover up fiberboard below that is
very wet. Below that is gravel and below that is the original tar and
paper which is dry. This is the layer I'll have to get to before
putting anything over it, I figure. Cleaning down to that will take a
lot of work and a dumpster to get rid of the stuff.
As for insulation in the ceilings: the original ceiling is lath and
plaster and there is blown rockwool above that, maybe 4 to 6 inches.
The roof void is not properly ventilated but clearly there are gaps
around the edges where the roof rests on the brick walls.
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