I dont care how many bugs are in a can with the lid on. POint is very valid. If you do not properly ventliate the roof you void the warranty. You can not mix ventilation products. Hense if he does not have enough ridge line then ridge vent is out of the question. Why is there always an arguement about ridge vent? If the guy has a standard hip roof ranch then for sure he does not have enough ridge to support the ridge vent theory.
Marshall: It’s “cajones”.
Every one else: I don’t know where the OP is located, but I do know ridge vents in Texas work better than anywhere else in the USA because O.U. sucks.
-end-
Oops…I should’ve mentioned, I’m in Maryland, about 15 miles north of DC. Sorry for leaving that out.
Thanks for all this info everyone, it’s really helping me understand ventilation better. Everyone’s making great points and you’ve given me options I didn’t know were available. Thanks.
hey geeks,
making your location known should be a part of registration here.
sorry.
the fact that your a terp, makes vetalation
very important.
you dont want the snow drippin inside your attic.
if you lived down the street from me, it really wouldnt matter.
so listen to the snow roofers here.
good luck.
gweedo
There just happens to be snow on my roof this morning.
[Beverly Sills]**There’s SNOW bizness like roof bizness…[/Beverly Sills]
High temp here in Austin of around 67 degrees.
OK, there’s one item y’all didn’t mention that will assist with his situation & that’s an INTAKE BOOSTER fan by GAF. Solar powered, gets installed about 3’ up from the “warm wall” (or structural wall). It moves about 500 cfm & if you have a ridge vent for your exhaust, this will make your intake work efficiently.
Solar powered, so there is no need for an electrician to wire it up.
GAF MasterFlow Intake Booster (in PDF format)
IMO, it’s faster & easier however the DCI SmartVent that Ed mentioned is much less visible - especially on a 2 story roof.**
You can over compensate the intake ventilation on a hip roof with a limited ridge length.
As long as the TOTAL NFVA is being provided for in the totoal attic ventilation scenario, the proper amount of total NFVA can be achieved.
As a matter of fact, many research studies indicate that if one were to choose just one aspect of ventilation for the attic structure, the intake ventilation holds greater importance.
Ed
now that was ridiculous
how did you get my modeling pics?
Dennis you need to see a doctor about that. I will say it looks like you have slimmed down a bit since i last seen you. LOL
Hmmmm… I don’t recall seeing a mustache in the ad, so he must be using a body double for the TV spots.
You do need intake ventilation, the vented drip edge sounds like your best option.
You will not need your power vent but it wont hurt, you cant have to much ventilation.
oooo…you did it now, you said fighting words…get 'em boys!!!
I’m too tired for this one. Um, lesse… I think it’s Tar’s turn. Or GTP. Oh, I may chime in here 'n there, maybe throw a grenade from the back bench; but the discussion as a whole, not mine to kick off.
PS: Will there be felt or no felt with your meal tonight? Full strip to bare wood or layers left on?
K-ThxBai
ANd the peanut gallery come alive and speaks out the back side.
You CANNOT have a power vent and ridge vent at the same time. Air follow the path of least resistance , with that what do you do when the power vent sucks air from the ridge vent rather than the intake source?
Please tell since i do this for a living please thi sis gonna be good
Missouri roofer this means you.
Drip vent first off looks like crap and smart vent you really cant see.
Tar, you’re next.
if you use just a soffit vent there is no flow you need the ridge and soffit vent to create the flow like the movement of air in the loft space creates a sort of suction with both
GTP,
Please feel free to double check my calculations as math is not my strong suit.
The Certainteed power attic ventilator moving 1170cfm of air requires 3.9 square feet of free air intake.(that’s the small one)
3.9 sq.ft equals 2190 sq.in.
Shinglevent 2 has 18sq. in. of net free area per foot.
2190/18 = 121
The power vent would then need 121 feet of ridge vent to draw it’s air from.
Best case scenario for you is a 60 foot long roof with two 30 foot gables at the center. And a 30’ rafter length.
Did I get that right?