I am in the process of stripping old shingles, putting plywood over old
sheathing and adding new shingles. The roof is over an attic that was
converted into a bedroom. The current roof has a ridge vent but no
Soffet vents. I was told that the best way to add a soffet vent is to
put strapping down between the plywood and old sheathing in order to
create a ventilation space. Then cut holes in the top of the old
sheating over the eaves. Then put he plywood down, cap the space and
add the vents on the bottom side of the eaves. Is this the correct way
to do this???

Thanks in advance!

On 6 Sep 2006 09:25:02 -0700, "
wrote:

I am in the process of stripping old shingles, putting plywood over old
sheathing and adding new shingles. The roof is over an attic that was
converted into a bedroom. The current roof has a ridge vent but no
Soffet vents. I was told that the best way to add a soffet vent is to
put strapping down between the plywood and old sheathing in order to
create a ventilation space. Then cut holes in the top of the old
sheating over the eaves. Then put he plywood down, cap the space and
add the vents on the bottom side of the eaves. Is this the correct way
to do this???

It's *A* correct way to do it, although I suspect that
using something thicker than strapping would get you better
airflow. (The strapping is running eave-to-ridge, right?
not gable-to-gable?)

Yes that is correct the strapping would run eave-to-ridge.... Are there
any products out there that I could slide in under the current
sheathing to create channels? It would be nice to just have to go over
the old sheathing with plywood and not have all of the problems
associated with spacing the plywood up. I was wondering if I could
remove some of the old sheahing and slide some kind of duct in between
the sheathing and the insulation???

Goedjn wrote:
On 6 Sep 2006 09:25:02 -0700, "
wrote:

I am in the process of stripping old shingles, putting plywood over old
sheathing and adding new shingles. The roof is over an attic that was
converted into a bedroom. The current roof has a ridge vent but no
Soffet vents. I was told that the best way to add a soffet vent is to
put strapping down between the plywood and old sheathing in order to
create a ventilation space. Then cut holes in the top of the old
sheating over the eaves. Then put he plywood down, cap the space and
add the vents on the bottom side of the eaves. Is this the correct way
to do this???

It's *A* correct way to do it, although I suspect that
using something thicker than strapping would get you better
airflow. (The strapping is running eave-to-ridge, right?
not gable-to-gable?)

According to :
Yes that is correct the strapping would run eave-to-ridge.... Are there
any products out there that I could slide in under the current
sheathing to create channels? It would be nice to just have to go over
the old sheathing with plywood and not have all of the problems
associated with spacing the plywood up. I was wondering if I could
remove some of the old sheahing and slide some kind of duct in between
the sheathing and the insulation???

You need something more substantial than strapping. Especially
if you want to insulate.

In a house where they had a T&G cathedral ceiling, they ended up going
with 2x8's on edge. 5.5" fiberglass batts on top of the T&G, then
2" worth of air gap before the plywood sheathing.
--
Chris Lewis, Una confibula non set est
It's not just anyone who gets a Starship Cruiser class named after them.

On 6 Sep 2006 13:58:06 -0700, "
wrote:

Yes that is correct the strapping would run eave-to-ridge.... Are there
any products out there that I could slide in under the current
sheathing to create channels? It would be nice to just have to go over
the old sheathing with plywood and not have all of the problems
associated with spacing the plywood up. I was wondering if I could
remove some of the old sheahing and slide some kind of duct in between
the sheathing and the insulation???

Not that I can think of, no. And it would compress the existing
insulation probably more than you want, anyway.

Look at it this way, This is an excellent opportunity to
add a 1" layer of urethane foam on TOP of the existing
deck. (Foam, then sleepers, then nailable deck.)

wrote:
I am in the process of stripping old shingles, putting plywood over old
sheathing and adding new shingles. The roof is over an attic that was
converted into a bedroom. The current roof has a ridge vent but no
Soffet vents. I was told that the best way to add a soffet vent is to
put strapping down between the plywood and old sheathing in order to
create a ventilation space. Then cut holes in the top of the old
sheating over the eaves. Then put he plywood down, cap the space and
add the vents on the bottom side of the eaves. Is this the correct way
to do this???

Thanks in advance!

I had the *exact* same thing done here at home, they're finishing off
the job inside as we speak.

They tore off the planks 3 ft from the bottom and 3 ft from the top,
put strapping horizontally, then 2 by 4s onto the existing chevrons
effectively raising the roof about 4 inches. Then aspenite, membrane,
shingles, and a couple of static ventilators on top, model 301 as shown
he http://www.ventilation-maximum.com/. That's the ventilation
part.

We're having urethane blown on the inside, about 5.5 inches, so
basically the same principle applies: nailing 2 by 4s to the existing
structure to give more space, urethane everywhere, gypsum, primer,
paint. For the exposed urethane in the storage areas we had this
fireproof coating applied. Yuk.

Oh surprise there was never any ventilation from the soffits in front,
the existing plywood(!) that blocked them was removed so now we're okay
from the soffit right up to the ventilator.

Picture here www.piscines-apollo.com/pictures/roof.jpg and here
www.piscines-apollo.com/pictures/roof1.jpg

If you want more pictures just email back.

Best regards,

I had the *exact* same thing done here at home, they're finishing off
the job inside as we speak.

Sorry I meant to say exact same problem.