our house in the Nashville area has a huge (cubic feet) attic that is
hotter then hell. There are 8 of what I call 'passive' vents mounted
near the peak, and plenty of soffet vents. Even so, there is
absolutely NO air flow. During the hot summer days, the few metal
shelves I have in there are HOT to the touch. So the attic is
absolutely useless as storage space for anything but the heartiest
items.

My plan is to replace 2 of the vents w/ those mushroom-shaped powered
vents, one on each end of the roof line, and block off the remaining
passive vents from the underside w/ a thin piece of plywood.I figure
this would force air to come in through the soffet vents and move all
that hot air out.

does that sound reasonable, and do any of you experts see a problem w/
that?
I mean blocking off the remaining vents should suffice, right, or do I
have to remove them and re-roof?

and can you believe that the dumb assed builder actually mounted some
of the vents so they cut across a rafter??? Lucky for me there are a
couple where the hole is completely between two rafters, or I'd have a
heck of a time mounting new vents.

thanks,
steve

oops - I forgot to mention - our 'bonus room' is upstairs too and is
cooled by a small heat pump mounted in the attic. Even w/ that, it's
still quite warm in the bonus room during the summer and I assume every
degree of temperature I can drop in the attic will improve the
effenciency of the heat pump, seeing how all it's ductwork in in the
'oven'.

steve again

On 31 May 2006 14:30:13 -0700, "Steve Kulpa"
wrote:

our house in the Nashville area has a huge (cubic feet) attic that is
hotter then hell. There are 8 of what I call 'passive' vents mounted
near the peak, and plenty of soffet vents. Even so, there is
absolutely NO air flow. During the hot summer days, the few metal
shelves I have in there are HOT to the touch. So the attic is
absolutely useless as storage space for anything but the heartiest
items.

My plan is to replace 2 of the vents w/ those mushroom-shaped powered
vents, one on each end of the roof line, and block off the remaining
passive vents from the underside w/ a thin piece of plywood.I figure
this would force air to come in through the soffet vents and move all
that hot air out.

does that sound reasonable, and do any of you experts see a problem w/
that?
I mean blocking off the remaining vents should suffice, right, or do I
have to remove them and re-roof?

and can you believe that the dumb assed builder actually mounted some
of the vents so they cut across a rafter??? Lucky for me there are a
couple where the hole is completely between two rafters, or I'd have a
heck of a time mounting new vents.

thanks,
steve


You will increase your energy consumption with powered fans, but it
will work. Don't block the existing vents, you can't have too many
vents. It will take time, but consider planting some shade trees on
the south or south-west side of the house.

Steve Kulpa wrote:
our house in the Nashville area has a huge (cubic feet) attic that is
hotter then hell. There are 8 of what I call 'passive' vents mounted
near the peak, and plenty of soffet vents. Even so, there is
absolutely NO air flow. During the hot summer days, the few metal
shelves I have in there are HOT to the touch. So the attic is
absolutely useless as storage space for anything but the heartiest
items.

My plan is to replace 2 of the vents w/ those mushroom-shaped powered
vents, one on each end of the roof line, and block off the remaining
passive vents from the underside w/ a thin piece of plywood.I figure
this would force air to come in through the soffet vents and move all
that hot air out.

does that sound reasonable, and do any of you experts see a problem w/
that?
I mean blocking off the remaining vents should suffice, right, or do I
have to remove them and re-roof?

and can you believe that the dumb assed builder actually mounted some
of the vents so they cut across a rafter??? Lucky for me there are a
couple where the hole is completely between two rafters, or I'd have a
heck of a time mounting new vents.

thanks,
steve

I had a similar problem with the attic above my detached 2-car garage
and installing an attic fan with thermostat kept the temperature down.

It's easy enough to do
http://www.easy2diy.com/cm/easy/diy_...ge_id=35720167 but
the difficult part is to figure out how much air flow you need.

I wouldn't block any vent, but you will have to do some calculations
to find the right sized fan. Google for "attic fan" for more...

Steve Kulpa wrote:

our house in the Nashville area has a huge (cubic feet) attic that is
hotter then hell. There are 8 of what I call 'passive' vents mounted
near the peak, and plenty of soffet vents. Even so, there is
absolutely NO air flow. During the hot summer days, the few metal
shelves I have in there are HOT to the touch. So the attic is
absolutely useless as storage space for anything but the heartiest
items.

My plan is to replace 2 of the vents w/ those mushroom-shaped powered
vents,

In my experience those are worthless.

one on each end of the roof line, and block off the remaining
passive vents from the underside w/ a thin piece of plywood.I figure
this would force air to come in through the soffet vents and move all
that hot air out.

does that sound reasonable, and do any of you experts see a problem w/
that?
I mean blocking off the remaining vents should suffice, right, or do I
have to remove them and re-roof?

and can you believe that the dumb assed builder actually mounted some
of the vents so they cut across a rafter??? Lucky for me there are a
couple where the hole is completely between two rafters, or I'd have a
heck of a time mounting new vents.

thanks,
steve


I live in Texas. It's hot here. The only thing I've found that
actually works is a powered ventilator (in my case in one of the
gables).

--
The e-mail address in our reply-to line is reversed in an attempt to
minimize spam. Our true address is of the form .

SQLit wrote:

"Phisherman" wrote in message
...

On 31 May 2006 14:30:13 -0700, "Steve Kulpa"
wrote:


our house in the Nashville area has a huge (cubic feet) attic that is
hotter then hell. There are 8 of what I call 'passive' vents mounted
near the peak, and plenty of soffet vents. Even so, there is
absolutely NO air flow. During the hot summer days, the few metal
shelves I have in there are HOT to the touch. So the attic is
absolutely useless as storage space for anything but the heartiest
items.

My plan is to replace 2 of the vents w/ those mushroom-shaped powered
vents, one on each end of the roof line, and block off the remaining
passive vents from the underside w/ a thin piece of plywood.I figure
this would force air to come in through the soffet vents and move all
that hot air out.

does that sound reasonable, and do any of you experts see a problem w/
that?
I mean blocking off the remaining vents should suffice, right, or do I
have to remove them and re-roof?

and can you believe that the dumb assed builder actually mounted some
of the vents so they cut across a rafter??? Lucky for me there are a
couple where the hole is completely between two rafters, or I'd have a
heck of a time mounting new vents.

thanks,
steve


You will increase your energy consumption with powered fans, but it
will work. Don't block the existing vents, you can't have too many
vents. It will take time, but consider planting some shade trees on
the south or south-west side of the house.


I agree with the increased electrical usage.
I disagree that fans will provide any great difference in temp. Unless your
moving 6000 cfm through the attic. Huge area says to me large roof area.
Really no way stop the sun from shining.

Spend your money on more insulation and a pro to check out the units.


I'm a firm believer that gable fans are effective. Eventually I hope to
be able to prove that quantitatively -- I've been adding instrumentation
to my house to log temperatures, energy consumption, etc. It's a work
in progress at this point, though.

--
The e-mail address in our reply-to line is reversed in an attempt to
minimize spam. Our true address is of the form .

Carpenter wrote:

Steve Kulpa wrote:

our house in the Nashville area has a huge (cubic feet) attic that is
hotter then hell. There are 8 of what I call 'passive' vents mounted
near the peak, and plenty of soffet vents. Even so, there is
absolutely NO air flow. During the hot summer days, the few metal
shelves I have in there are HOT to the touch. So the attic is
absolutely useless as storage space for anything but the heartiest
items.

My plan is to replace 2 of the vents w/ those mushroom-shaped powered
vents, one on each end of the roof line, and block off the remaining
passive vents from the underside w/ a thin piece of plywood.I figure
this would force air to come in through the soffet vents and move all
that hot air out.

does that sound reasonable, and do any of you experts see a problem w/
that?
I mean blocking off the remaining vents should suffice, right, or do I
have to remove them and re-roof?

and can you believe that the dumb assed builder actually mounted some
of the vents so they cut across a rafter??? Lucky for me there are a
couple where the hole is completely between two rafters, or I'd have a
heck of a time mounting new vents.

thanks,
steve


I had a similar problem with the attic above my detached 2-car garage
and installing an attic fan with thermostat kept the temperature down.

It's easy enough to do
http://www.easy2diy.com/cm/easy/diy_...ge_id=35720167 but
the difficult part is to figure out how much air flow you need.

I wouldn't block any vent, but you will have to do some calculations
to find the right sized fan. Google for "attic fan" for more...

The complication I encountered was the need for a safety interlock to
keep the furnace from running at the same time as the fan (my furnace
is in the attic). That one detail slowed my progress dramatically.

--
The e-mail address in our reply-to line is reversed in an attempt to
minimize spam. Our true address is of the form .

Steve Kulpa wrote:
our house in the Nashville area has a huge (cubic feet) attic that is
hotter then hell. There are 8 of what I call 'passive' vents mounted
near the peak, and plenty of soffet vents. Even so, there is
absolutely NO air flow. During the hot summer days, the few metal
shelves I have in there are HOT to the touch. So the attic is
absolutely useless as storage space for anything but the heartiest
items.

My plan is to replace 2 of the vents w/ those mushroom-shaped powered
vents, one on each end of the roof line, and block off the remaining
passive vents from the underside w/ a thin piece of plywood.I figure
this would force air to come in through the soffet vents and move all
that hot air out.

does that sound reasonable, and do any of you experts see a problem w/
that?
I mean blocking off the remaining vents should suffice, right, or do I
have to remove them and re-roof?

and can you believe that the dumb assed builder actually mounted some
of the vents so they cut across a rafter??? Lucky for me there are a
couple where the hole is completely between two rafters, or I'd have a
heck of a time mounting new vents.

thanks,
steve

I suggest looking at the Building Science Corporation web site.
The item "Venting on Venting" would be worth consideration before
cutting more holes in the roof.
TB

Steve Kulpa wrote:
our house in the Nashville area has a huge (cubic feet) attic that is
hotter then hell. There are 8 of what I call 'passive' vents mounted
near the peak, and plenty of soffet vents. Even so, there is
absolutely NO air flow. During the hot summer days, the few metal
shelves I have in there are HOT to the touch. So the attic is
absolutely useless as storage space for anything but the heartiest
items.

My plan is to replace 2 of the vents w/ those mushroom-shaped powered
vents, one on each end of the roof line, and block off the remaining
passive vents from the underside w/ a thin piece of plywood.I figure
this would force air to come in through the soffet vents and move all
that hot air out.

does that sound reasonable, and do any of you experts see a problem w/
that?
I mean blocking off the remaining vents should suffice, right, or do I
have to remove them and re-roof?

and can you believe that the dumb assed builder actually mounted some
of the vents so they cut across a rafter??? Lucky for me there are a
couple where the hole is completely between two rafters, or I'd have a
heck of a time mounting new vents.

thanks,
steve

Don't bother. Make sure the vents you have meet local codes. Don't
expect it to every be cool up there. That is why you have insulation under
that area. You ventilate to keep the temperatures down a little and really
to keep the moisture down.

My experience is that most all attempts at using power vents end up
without merit, except to those people selling them.

--
Joseph Meehan

Dia duit

CJT wrote:
Carpenter wrote:

Steve Kulpa wrote:

our house in the Nashville area has a huge (cubic feet) attic that is
hotter then hell. There are 8 of what I call 'passive' vents mounted
near the peak, and plenty of soffet vents. Even so, there is
absolutely NO air flow. During the hot summer days, the few metal
shelves I have in there are HOT to the touch. So the attic is
absolutely useless as storage space for anything but the heartiest
items.

My plan is to replace 2 of the vents w/ those mushroom-shaped powered
vents, one on each end of the roof line, and block off the remaining
passive vents from the underside w/ a thin piece of plywood.I figure
this would force air to come in through the soffet vents and move all
that hot air out.

does that sound reasonable, and do any of you experts see a problem w/
that?
I mean blocking off the remaining vents should suffice, right, or do I
have to remove them and re-roof?

and can you believe that the dumb assed builder actually mounted some
of the vents so they cut across a rafter??? Lucky for me there are a
couple where the hole is completely between two rafters, or I'd have a
heck of a time mounting new vents.

thanks,
steve


I had a similar problem with the attic above my detached 2-car garage
and installing an attic fan with thermostat kept the temperature down.

It's easy enough to do
http://www.easy2diy.com/cm/easy/diy_...ge_id=35720167 but
the difficult part is to figure out how much air flow you need.

I wouldn't block any vent, but you will have to do some calculations
to find the right sized fan. Google for "attic fan" for more...

The complication I encountered was the need for a safety interlock to
keep the furnace from running at the same time as the fan (my furnace
is in the attic). That one detail slowed my progress dramatically.

Glad you made it work in the end...

"Phisherman" wrote in message ...
On 31 May 2006 14:30:13 -0700, "Steve Kulpa"
wrote:

our house in the Nashville area has a huge (cubic feet) attic that is
hotter then hell. There are 8 of what I call 'passive' vents mounted
near the peak, and plenty of soffet vents. Even so, there is
absolutely NO air flow. During the hot summer days, the few metal
shelves I have in there are HOT to the touch. So the attic is
absolutely useless as storage space for anything but the heartiest
items.

My plan is to replace 2 of the vents w/ those mushroom-shaped powered
vents, one on each end of the roof line, and block off the remaining
passive vents from the underside w/ a thin piece of plywood.I figure
this would force air to come in through the soffet vents and move all
that hot air out.

does that sound reasonable, and do any of you experts see a problem w/
that?
I mean blocking off the remaining vents should suffice, right, or do I
have to remove them and re-roof?

and can you believe that the dumb assed builder actually mounted some
of the vents so they cut across a rafter??? Lucky for me there are a
couple where the hole is completely between two rafters, or I'd have a
heck of a time mounting new vents.

thanks,
steve


You will increase your energy consumption with powered fans, but it
will work. Don't block the existing vents, you can't have too many
vents. It will take time, but consider planting some shade trees on
the south or south-west side of the house.

Existing vents near the exhaust fan will "short circuit" the air flow. He wants the
air to be drawn from the lowest, furthest vents, not from the closest vent at the
top. Of course, it would be easy to experiment to find the best result.

Bob

CJT wrote:
Carpenter wrote:

Steve Kulpa wrote:

our house in the Nashville area has a huge (cubic feet) attic that is
hotter then hell. There are 8 of what I call 'passive' vents mounted
near the peak, and plenty of soffet vents. Even so, there is
absolutely NO air flow. During the hot summer days, the few metal
shelves I have in there are HOT to the touch. So the attic is
absolutely useless as storage space for anything but the heartiest
items.

My plan is to replace 2 of the vents w/ those mushroom-shaped powered
vents, one on each end of the roof line, and block off the remaining
passive vents from the underside w/ a thin piece of plywood.I figure
this would force air to come in through the soffet vents and move all
that hot air out.

does that sound reasonable, and do any of you experts see a problem w/
that?
I mean blocking off the remaining vents should suffice, right, or do I
have to remove them and re-roof?

and can you believe that the dumb assed builder actually mounted some
of the vents so they cut across a rafter??? Lucky for me there are a
couple where the hole is completely between two rafters, or I'd have a
heck of a time mounting new vents.

thanks,
steve


I had a similar problem with the attic above my detached 2-car garage
and installing an attic fan with thermostat kept the temperature down.

It's easy enough to do
http://www.easy2diy.com/cm/easy/diy_...ge_id=35720167 but
the difficult part is to figure out how much air flow you need.

I wouldn't block any vent, but you will have to do some calculations
to find the right sized fan. Google for "attic fan" for more...

The complication I encountered was the need for a safety interlock to
keep the furnace from running at the same time as the fan (my furnace
is in the attic). That one detail slowed my progress dramatically.

I fail to see any conditions where a thermostatically controlled fan
would EVER be operational in a 95F attic at the SAME time that HEATING
was needed in the living space.

Ok, an IDIOT of a building inspector would INSIST on such a safety
interlock as his/her thinking is that one day the thermostat will fail
and the fan will run when the attic temp is 35F, outside temp is 20F and
the furnace needs to run, but STARVES for air flow and the flame goes
out, gas builds in the attic and on the next spark, BOOM!!!!

Steve,

You may also want to look at these Solar Roof Vents:
http://www.houseneeds.com/shop/vent/...attickfans.asp

They move about 800 CFM under full sun light. So depending on the size
of your attic you may need more than one.

Below is some data from the Florida Solar Energy Center :
Comparing periods with similar weather conditions, the test revealed
that the PV vent fans have the potential to reduce measured peak summer
attic air temperatures by over 20oF. However, the impact over the
cooling season is fairly modest with well insulated attics. Measured
space cooling reduction was approximately 6% - worth about 460 kWh
annually at the test home.

http://www.fsec.ucf.edu/bldg/pubs/pvfan/index.htm

So, you might gain a 20 Temp decrease and a 6% savings depending on the
particulars of your home.


Steve Kulpa wrote:
our house in the Nashville area has a huge (cubic feet) attic that is
hotter then hell. There are 8 of what I call 'passive' vents mounted
near the peak, and plenty of soffet vents. Even so, there is
absolutely NO air flow. During the hot summer days, the few metal
shelves I have in there are HOT to the touch. So the attic is
absolutely useless as storage space for anything but the heartiest
items.

My plan is to replace 2 of the vents w/ those mushroom-shaped powered
vents, one on each end of the roof line, and block off the remaining
passive vents from the underside w/ a thin piece of plywood.I figure
this would force air to come in through the soffet vents and move all
that hot air out.

does that sound reasonable, and do any of you experts see a problem w/
that?
I mean blocking off the remaining vents should suffice, right, or do I
have to remove them and re-roof?

and can you believe that the dumb assed builder actually mounted some
of the vents so they cut across a rafter??? Lucky for me there are a
couple where the hole is completely between two rafters, or I'd have a
heck of a time mounting new vents.

thanks,
steve

Steve Kulpa wrote:
our house in the Nashville area has a huge (cubic feet) attic that is
hotter then hell. There are 8 of what I call 'passive' vents mounted
near the peak, and plenty of soffet vents. Even so, there is
absolutely NO air flow. During the hot summer days, the few metal
shelves I have in there are HOT to the touch. So the attic is
absolutely useless as storage space for anything but the heartiest
items.

My plan is to replace 2 of the vents w/ those mushroom-shaped powered
vents, one on each end of the roof line, and block off the remaining
passive vents from the underside w/ a thin piece of plywood.I figure
this would force air to come in through the soffet vents and move all
that hot air out.

does that sound reasonable, and do any of you experts see a problem w/
that?
I mean blocking off the remaining vents should suffice, right, or do I
have to remove them and re-roof?

and can you believe that the dumb assed builder actually mounted some
of the vents so they cut across a rafter??? Lucky for me there are a
couple where the hole is completely between two rafters, or I'd have a
heck of a time mounting new vents.

thanks,
steve

Do you have any idea what the AREA is for soffit vents, peak vents, and
roof?

On 31 May 2006 14:30:13 -0700, "Steve Kulpa"
wrote:

our house in the Nashville area has a huge (cubic feet) attic that is

Huge is relative of course

hotter then hell. There are 8 of what I call 'passive' vents mounted
near the peak, and plenty of soffet vents. Even so, there is
absolutely NO air flow. During the hot summer days, the few metal

Any chance your insulation is covering the soffitt vents inside?

I never measured airflow but I know it was incredibly hot until I got
my roof fan (I call them. A lot of people call them powered fans, I
guess to exclude wind powered turbines, but to me unless it's a hand
fan that's not moving, it's powered. :-)

I'm a big believer in roof fans. Read all my old posts in google with
author meirman. Recently I've not had a sig and I don't know if
google will search on my from address.


shelves I have in there are HOT to the touch. So the attic is
absolutely useless as storage space for anything but the heartiest
items.

My plan is to replace 2 of the vents w/ those mushroom-shaped powered
vents, one on each end of the roof line, and block off the remaining
passive vents from the underside w/ a thin piece of plywood.I figure

As to blocking off passive vents, it seems to make sense. I didn't
do it and I have a ridge vent the whole width of my townhouse. Yet,
15 years after I installed the fan, I was up on a ladder by the
soffitts, and there was a layer of "lint"** across the entire soffit
screen, which also runs th ewhole width of the house, front and back.
My neighbors without fans didn't have any of this.


**Like from a lint screen in a dryer, mostly white or grey with black
parts, but not as thick and made up of plant seeds etc.


this would force air to come in through the soffet vents and move all
that hot air out.

does that sound reasonable, and do any of you experts see a problem w/
that?
I mean blocking off the remaining vents should suffice, right, or do I
have to remove them and re-roof?

You should be able to plug a hole. Even a layer of carboard stapled
over the hole will stop 95 to 100% of the convection. If you're
happy, when you reroof anyhow, you can remove them.


and can you believe that the dumb assed builder actually mounted some
of the vents so they cut across a rafter??? Lucky for me there are a
couple where the hole is completely between two rafters, or I'd have a
heck of a time mounting new vents.

thanks,
steve

Robert Gammon wrote:

CJT wrote:

Carpenter wrote:

Steve Kulpa wrote:

our house in the Nashville area has a huge (cubic feet) attic that is
hotter then hell. There are 8 of what I call 'passive' vents mounted
near the peak, and plenty of soffet vents. Even so, there is
absolutely NO air flow. During the hot summer days, the few metal
shelves I have in there are HOT to the touch. So the attic is
absolutely useless as storage space for anything but the heartiest
items.

My plan is to replace 2 of the vents w/ those mushroom-shaped powered
vents, one on each end of the roof line, and block off the remaining
passive vents from the underside w/ a thin piece of plywood.I figure
this would force air to come in through the soffet vents and move all
that hot air out.

does that sound reasonable, and do any of you experts see a problem w/
that?
I mean blocking off the remaining vents should suffice, right, or do I
have to remove them and re-roof?

and can you believe that the dumb assed builder actually mounted some
of the vents so they cut across a rafter??? Lucky for me there are a
couple where the hole is completely between two rafters, or I'd have a
heck of a time mounting new vents.

thanks,
steve



I had a similar problem with the attic above my detached 2-car garage
and installing an attic fan with thermostat kept the temperature down.

It's easy enough to do
http://www.easy2diy.com/cm/easy/diy_...ge_id=35720167 but
the difficult part is to figure out how much air flow you need.

I wouldn't block any vent, but you will have to do some calculations
to find the right sized fan. Google for "attic fan" for more...

The complication I encountered was the need for a safety interlock to
keep the furnace from running at the same time as the fan (my furnace
is in the attic). That one detail slowed my progress dramatically.

I fail to see any conditions where a thermostatically controlled fan
would EVER be operational in a 95F attic at the SAME time that HEATING
was needed in the living space.

Ok, an IDIOT of a building inspector would INSIST on such a safety
interlock as his/her thinking is that one day the thermostat will fail
and the fan will run when the attic temp is 35F, outside temp is 20F and
the furnace needs to run, but STARVES for air flow and the flame goes
out, gas builds in the attic and on the next spark, BOOM!!!!

Operator error and malfunction are both possible and call for a failsafe
control system.

--
The e-mail address in our reply-to line is reversed in an attempt to
minimize spam. Our true address is of the form .

mm wrote:
On 31 May 2006 14:30:13 -0700, "Steve Kulpa"
wrote:

our house in the Nashville area has a huge (cubic feet) attic that is

Huge is relative of course

sorry, I didn't measure - but due to the high peaked roof, there are
many many cubic feet of air space.


Any chance your insulation is covering the soffitt vents inside?

those flat plastic 'vent extensions' are in place which I assume allow
an unrestricted path to the soffit - but I haven't actually checked
them.


steve

Well, shoot - I posted a long response to one of the replies above and
it never made it.
anyway, here's a picture of the roof I'm talking about:

http://www.geocities.com/stevekulpa/temp/house.jpg

steve

Steve Kulpa wrote:

mm wrote:

On 31 May 2006 14:30:13 -0700, "Steve Kulpa"
wrote:


our house in the Nashville area has a huge (cubic feet) attic that is

Huge is relative of course


sorry, I didn't measure - but due to the high peaked roof, there are
many many cubic feet of air space.


Any chance your insulation is covering the soffitt vents inside?


those flat plastic 'vent extensions' are in place which I assume allow
an unrestricted path to the soffit - but I haven't actually checked
them.


steve

The stuff I have read refers to area of attic. I have no idea of how or
when the volume of the attic applies. It seems a larger roof area
exposed to sun would take on more heat, but perhaps the higher peak
(more volume) offsets the rise in the interior temp. So, area of attic
floor .. a 50' by 30' attic floor is 1500 sq. feet of floor. The 1:300
formula gives 5 sq. ft. vent area for 1500 sq. feet of attic floor.

The "bonus room" is an add-on? Heat pump in attic? Does it ventilate
to outside? If not, it seems it would heat the attic .. our heat
pump/AC puts out an awful lot of heat in summer, to the outdoors.

On 2 Jun 2006 12:18:15 -0700, "Steve Kulpa"
wrote:


mm wrote:
On 31 May 2006 14:30:13 -0700, "Steve Kulpa"
wrote:

our house in the Nashville area has a huge (cubic feet) attic that is

Huge is relative of course

sorry, I didn't measure - but due to the high peaked roof, there are
many many cubic feet of air space.

We know volume can be measured in cubic feet. If you gave an estimate
of the height of the roof, that would indicate much more. When you
stand up in the attic, is the roof twice as high as you are tall? 1.5
times as high? 2.5 times. Are you about 6 feet?


Any chance your insulation is covering the soffitt vents inside?

those flat plastic 'vent extensions' are in place which I assume allow
an unrestricted path to the soffit - but I haven't actually checked
them.


steve

wrote in message
I suggest looking at the Building Science Corporation web site.
The item "Venting on Venting" would be worth consideration before
cutting more holes in the roof.

I can't find it.

Bob