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Posted by on January 25, 2007, 8:38 am
> Typically good insulation will make the snow and or frost last longer
> on the roof. If you have a garage that's uninsulated, without a
> ceiling, the interior/roof will generally be the same temperature.
>
> You can also tell a lot about the health of your roof and attic by
> looking up on the roof regularly. For example if you have a spot near
> the eave that constantly melts but there's snow above and below, you
> have insulation/ventilation issues. This leads to a whole list of more
> questions, is there vent space between the insulation and the roof, is
> there adequate ventilation from the eave to the peak?
>
> Here's a link on ice dams that explains a lot about roof ventilation:
> <http://www.buildingscience.ca/documents/digests/bsd-135-ice-dams/2006...>
> and another for some great information on heating and ventilation:
> <http://www.buildingscience.ca/buildingphysics/thermalcontrol/heatflow...>
>
> If you suspect issues and are able, crawl into the attic and see what's
> going on...
>
> Good luck,
>
> DAC
>
>
>
>
> > I'm confused about something. I've always heard that you can tell how
> > good the insulation is in the attic/roof by how long it takes for the
> > snow to melt off the roof. Does good insulation in your attic/roof make
> > the snow melt off quicker or does it take longer?
>
> > I tried looking at different roofs in the area to figure this out but
> > it only confuses me more. For example, my garage and shed still have
> > snow on them but my house doesn't. Sometimes a neighbors (much newer)
> > house will have snow on the roof and mine won't have any. Then I look
> > at another shed that has no insulation and is somewhat in the shade and
> > it has no snow on the roof.
>
> > When I searched on Google, that confused me as well because unless I'm
> > reading something wrong (I probably am) it's saying that my shed has
> > better insulation than my house! BTW, the roof of the garage and house
> > are both facing the southwest and the garage roof is only slightly
> > lower than the house roof.- Hide quoted text -- Show quoted text -
For the rate of snow melting to have any relation to insulation, the
space underneath has to be heated, like the living space of a house.
If the insulation is lacking, enough heat can rise to the roof to make
it melt faster. However, even here a lot depends on other factors
too. If the roof is poorly vented, it will likely melt faster, as
little outside air can work it's way inside. And obviously the
exposure the roof has to the sun is going to be a big factor. A roof
facing southwest is going to melt a lot faster than one facing north.
The garage roof is going to take longer to melt, because there is no
heat in the garage.
The unheated shed in the shade may have had less snow to begin with,
being blocked by trees perhaps?
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