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Home Repair - - If it ain't broken, don't fix it. Otherwise look here.
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Posted by on April 23, 2008, 7:07 pm
I assumed it was to allow for expansion/contraction due to temperature
changes, which is why I was concerned about glueing down a new roof.
I suppose I could do a test: mark a few points and measure between
them at different temps.
Now another question...Can/should I use exterior plywood for the
underlayment instead of the [current] Iso-Board?
> You have a real oddball there, Mike. =A0Typically flat roofs are done in
> bitumen (torch-down), EPDM (rubber), or tar & gravel. =A0Rubber roofs
> typically have a service life of around 40 years, glued down, in all
> sorts of weather. =A0Temperatures should not be an issue, but uplift can
> be, depending on the size of the roof.
>
> JK
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Posted by ransley on April 23, 2008, 7:35 pm
On Apr 23, 6:07=A0pm, mke...@gmail.com wrote:
> I assumed it was to allow for expansion/contraction due to temperature
> changes, which is why I was concerned about glueing down a new roof.
>
> I suppose I could do a test: mark a few points and measure between
> them at different temps.
>
> Now another question...Can/should I use exterior plywood for the
> underlayment instead of the [current] Iso-Board?
>
>
>
>
> > You have a real oddball there, Mike. =A0Typically flat roofs are done in=
> > bitumen (torch-down), EPDM (rubber), or tar & gravel. =A0Rubber roofs
> > typically have a service life of around 40 years, glued down, in all
> > sorts of weather. =A0Temperatures should not be an issue, but uplift can=
> > be, depending on the size of the roof.
>
> > JK- Hide quoted text -
>
> - Show quoted text -
Look into a rubber roof it is melted in place, or if your flat roof is
in a high heating area like Zone 6 or less , consider FOAM roofing of
up to 7 inches, I am considering it. Many flat roof construction has
no insulation in my area, heat loss is maybe 40% up and out an
uninsulated roof for me thats $6000+ a year. Think about cutting your
bill 20-30%
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Posted by on April 23, 2008, 8:25 pm
Well, I'm fairly certain the current roof is rubber (black, stretchy,
kinda smells on a hot day, and marks up my bare hands). And what I'm
considering is WeatherBond (EPDM), which is also rubber. I'm not sure
I have much heating loss throug the roof, as the roof joists contain
fiberglass batts.
I am considering the white EPDM, though, since that black just soaks
up the heat in summer.
> Look into a rubber roof it is melted in place, or if your flat roof is
> in a high heating area like Zone 6 or less , consider FOAM roofing of
> up to 7 inches, I am considering it. Many flat roof construction has
> no insulation in my area, heat loss is maybe 40% up and out an
> uninsulated roof =A0for me thats $6000+ a year. Think about cutting your
> bill 20-30%- Hide quoted text -
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Posted by Big_Jake on April 23, 2008, 9:59 pm
On Apr 23, 7:25 pm, mke...@gmail.com wrote:
> Well, I'm fairly certain the current roof is rubber (black, stretchy,
> kinda smells on a hot day, and marks up my bare hands). And what I'm
> considering is WeatherBond (EPDM), which is also rubber. I'm not sure
> I have much heating loss throug the roof, as the roof joists contain
> fiberglass batts.
>
> I am considering the white EPDM, though, since that black just soaks
> up the heat in summer.
>
>
> > Look into a rubber roof it is melted in place, or if your flat roof is
> > in a high heating area like Zone 6 or less , consider FOAM roofing of
> > up to 7 inches, I am considering it. Many flat roof construction has
> > no insulation in my area, heat loss is maybe 40% up and out an
> > uninsulated roof for me thats $6000+ a year. Think about cutting your
> > bill 20-30%- Hide quoted text -
A "rubber" roof that is melted in place is likely a bitumen "torch-
down" roof, which typically only has a life of 20 years or so. EPDM
isn't generally glued directly to plywood. There is a "chipboard"
that is used as underlayment for it, as plywood could have splinters
big enough to cause issues with rubber.
The "iso" board is likely very high in R-value, usually R5 to R7.5 per
inch.
JK
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Page 2 of 2 << first < 1 2
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