Venting garage roof
 

I have a question about venting a garage roof.
I am turning my detached garage into a woodworking shop. I am adding heat
and ac and will thus insulate. I know that a building with an attic space
needs to be vented. However, can I insulate right onto the roof, in other
words, put the insulation right between the joists and right up against the
roof sheeting? Or do I need to make an attic space and vent the roof?
Thanks
Rob
Through the golden door our children can walk into tomorrow with the
knowledge that no one can be denied the promise that is America.
~Ronald W. Reagan

You need to keep an airgap. Typical job would require a ridgevent and eave
vents with special cardboard or foam inserts above the insulation so the air
can flow and keep the shingles a bit cooler and moisture a place to go.


"Rob Hall" wrote in message
...
I have a question about venting a garage roof.
I am turning my detached garage into a woodworking shop. I am adding heat
and ac and will thus insulate. I know that a building with an attic space
needs to be vented. However, can I insulate right onto the roof, in other
words, put the insulation right between the joists and right up against
the
roof sheeting? Or do I need to make an attic space and vent the roof?
Thanks
Rob
Through the golden door our children can walk into tomorrow with the
knowledge that no one can be denied the promise that is America.
~Ronald W. Reagan

which vent to use on a grage flat roof covered with tar paper?

Mike

"Art" wrote in message
k.net...
You need to keep an airgap. Typical job would require a ridgevent and
eave vents with special cardboard or foam inserts above the insulation so
the air can flow and keep the shingles a bit cooler and moisture a place
to go.


"Rob Hall" wrote in message
...
I have a question about venting a garage roof.
I am turning my detached garage into a woodworking shop. I am adding
heat
and ac and will thus insulate. I know that a building with an attic
space
needs to be vented. However, can I insulate right onto the roof, in
other
words, put the insulation right between the joists and right up against
the
roof sheeting? Or do I need to make an attic space and vent the roof?
Thanks
Rob
Through the golden door our children can walk into tomorrow with the
knowledge that no one can be denied the promise that is America.
~Ronald W. Reagan

Rob Hall wrote:
I have a question about venting a garage roof.
I am turning my detached garage into a woodworking shop. I am adding
heat and ac and will thus insulate. I know that a building with an
attic space needs to be vented. However, can I insulate right onto
the roof, in other words, put the insulation right between the joists
and right up against the roof sheeting? Or do I need to make an
attic space and vent the roof? Thanks
Rob
Through the golden door our children can walk into tomorrow with the
knowledge that no one can be denied the promise that is America.
~Ronald W. Reagan

Assuming it is not a flat roof, your roof will last longer and you will
have less likely hood of leaks if you do the attic and vent it. Your
garage - workshop may also be cooler in the summer that way.

--
Joseph Meehan

26 + 6 = 1 It's Irish Math

"Rob Hall" wrote in message
...
I have a question about venting a garage roof.
I am turning my detached garage into a woodworking shop. I am adding heat
and ac and will thus insulate. I know that a building with an attic space
needs to be vented. However, can I insulate right onto the roof, in other
words, put the insulation right between the joists and right up against
the
roof sheeting? Or do I need to make an attic space and vent the roof?
Thanks
Rob

insulating right onto the roof is known as a "hot roof", which might be
against building code in your area, can negatively effect heating/cooling
bills, and possibly void your roofing shingle warranty and effect your roof
in other ways

most seem to recommend ventilation

here's plenty of information on the topic from google archives of this
group:
http://groups-beta.google.com/groups...&num=100&hl=en








Through the golden door our children can walk into tomorrow with the
knowledge that no one can be denied the promise that is America.
~Ronald W. Reagan

During a reroof I had a turbine unstalled in the garage roof along the
southern California coast. It had been about 10° warmer than the
patio slab prior to the turbine and after installation it has been
about 10° cooler. It was surprising to me to find that much
difference. Ensure that the outlets for tools are wired separate from
the lights in the woodshop.

On Sun, 06 Feb 2005 23:50:29 GMT, "Rob Hall"
wrote:

I have a question about venting a garage roof.
I am turning my detached garage into a woodworking shop. I am adding heat
and ac and will thus insulate. I know that a building with an attic space
needs to be vented. However, can I insulate right onto the roof, in other
words, put the insulation right between the joists and right up against the
roof sheeting? Or do I need to make an attic space and vent the roof?
Thanks
Rob
Through the golden door our children can walk into tomorrow with the
knowledge that no one can be denied the promise that is America.
~Ronald W. Reagan