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ridge vents Choreboy 08-18-2005
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Posted by Choreboy on August 18, 2005, 6:48 pm


My roof covers 2,000 square feet with three louvered, screened gable
vents amounting to 9 square feet or 4.5 square feet of free area.

I'd like to add ridge vents. With a pitch of 6 in 12, I want to be able
to throw a rope across the ridge for safety if I work up there in the
future.

Will a rope crush a ridge vent? The metal ridge vents in my
neighborhood look bent.

I see three kinds for sale:

Air Vent Multi-Pitch Filter (aluminum)

Air Vent Shinge Vent II

Dow Corning Vent-Sure Rigid Roll

What's best?


Plumbing 468x60
Posted by mrkool on August 18, 2005, 8:37 pm


So why do you want to add ridge vents? for ventilation? if so, why
don't you use powered thermostatic controlled vent fans inside the
gable vents, that's just what I did, I can't believe the temperature
drop in my attic of 3000 sq ft, from 160+ to now, around 100,
will save on the shingles, keep the insulation from absorbing heat,
moisture control, and save on my compressors run time also put foil
backed ductwarp
over my insulation leaving some space between for moisture to escape.

But, if it's for another reason, please excuse my interuption, didn't
mean to but in.

mrkool



Posted by Choreboy on August 19, 2005, 3:03 am


mrkool wrote:
>
> So why do you want to add ridge vents? for ventilation? if so, why
> don't you use powered thermostatic controlled vent fans inside the
> gable vents, that's just what I did, I can't believe the temperature
> drop in my attic of 3000 sq ft, from 160+ to now, around 100,
> will save on the shingles, keep the insulation from absorbing heat,
> moisture control, and save on my compressors run time also put foil
> backed ductwarp
> over my insulation leaving some space between for moisture to escape.
>
> But, if it's for another reason, please excuse my interuption, didn't
> mean to but in.
>
> mrkool

Do you run your thermostatic fan in winter? How much power does it use?
Where do you measure the temperature?

I'm about to add ridge vents because they are the most cost-effective
method. They vent the hottest air all along the roof, and that air
tends to sweeps the underside of the decking.

I have a complex hip roof with no soffit vents. I have a north gable
and a west gable. I could put an exhaust fan in the west gable, which
has a single louvered vent. If I ran it, air would enter through the
vents in the north gable. Most of the attic would be dead air. So
ridge vents will be worthwhile if I get an exhaust fan one day. Before
I bought a fan, I'd install soffit vents.


Posted by on August 19, 2005, 8:19 am



>I'm about to add ridge vents because they are the most cost-effective method.

Moreso than a gable vent with the same free area?

>I have a complex hip roof with no soffit vents. I have a north gable
>and a west gable. I could put an exhaust fan in the west gable, which
>has a single louvered vent. If I ran it, air would enter through the
>vents in the north gable. Most of the attic would be dead air. So
>ridge vents will be worthwhile if I get an exhaust fan one day. Before
>I bought a fan, I'd install soffit vents.

You might not need the fan. How many cfm would it be? A few large soffit
and gable vents can be as effective as continuous vents, with less labor.

You might keep your attic 100 F on an 80 F day with a 1000 cfm fan, moving
about 1000x20 = 20K Btu/h out of the attic, OR use soffit and gable vents
with area A and an 8' height difference, where 20K = 16.6Asqrt(8)20^1.5,
ie A = 4.8 ft^2, with no fan.

Nick

Need an answer or a method for figuring which window, insulation, heating
system, etc to use? Ask us.

Join PE Drew Gillett and PhD Rich Komp and me for a workshop on Solar House
Heating and Natural Cooling Strategies at the first Pennsylvania Renewable
Energy Festival on Saturday September 24, 2005 near Allentown. See

http://www.paenergyfest.com/workshop-info.shtml



Posted by Choreboy on August 19, 2005, 2:28 pm


nicksanspam@ece.villanova.edu wrote:
>
>
> >I'm about to add ridge vents because they are the most cost-effective method.
>
> Moreso than a gable vent with the same free area?

That's what I've read. If you have rige vents and soffit vents, you
have several feet of height for convection, and your air movement is
spread out under the roof.
>
> >I have a complex hip roof with no soffit vents. I have a north gable
> >and a west gable. I could put an exhaust fan in the west gable, which
> >has a single louvered vent. If I ran it, air would enter through the
> >vents in the north gable. Most of the attic would be dead air. So
> >ridge vents will be worthwhile if I get an exhaust fan one day. Before
> >I bought a fan, I'd install soffit vents.
>
> You might not need the fan. How many cfm would it be? A few large soffit
> and gable vents can be as effective as continuous vents, with less labor.
>
> You might keep your attic 100 F on an 80 F day with a 1000 cfm fan, moving
> about 1000x20 = 20K Btu/h out of the attic, OR use soffit and gable vents
> with area A and an 8' height difference, where 20K = 16.6Asqrt(8)20^1.5,
> ie A = 4.8 ft^2, with no fan.
>
> Nick
>
> Need an answer or a method for figuring which window, insulation, heating
> system, etc to use? Ask us.
>
> Join PE Drew Gillett and PhD Rich Komp and me for a workshop on Solar House
> Heating and Natural Cooling Strategies at the first Pennsylvania Renewable
> Energy Festival on Saturday September 24, 2005 near Allentown. See
>
> http://www.paenergyfest.com/workshop-info.shtml


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