Venting Attic ???

s.gun

Can motor driven,turbine attic vents be mounted on a sloped roof ???The surface is on a slope of about 40 degrees above the horizontal...

p3skyking

Yes, but I had a bad motor once and no longer trust them

I use wind driven turbines on the roof with a 36in attic fan.
Even with the attic fan turned off, the turbines still spin.
The attic is about 100 degrees cooler.

ADDENDUM: I would have never known about the inop vent fan if I had not had to go into the attic. The attic fan is in the hallway and I know when it's running.

remingtonoaks

quote:Originally posted by p3skyking
Yes, but I had a bad motor once and no longer trust them

I use wind driven turbines on the roof with a 36in attic fan.
Even with the attic fan turned off, the turbines still spin.
The attic is about 100 degrees cooler.


Yep, the heat generated in the attic is what actually makes a turn. Of course a lot of long with the outside wind. But if it's turning on the calm day it's because of the heat in the attic is making it turns blowing the heat out and sucking the cooler air in. Although I think an electric one works better, but doubling up on the wind powered one compensates for it

DBMJR1

When considering attic ventilation, first look to see where the cool air is going to enter. Hopefully you have vented soffits around your home. Be sure these vents are not blocked by attic insulation.
You need the ability to intake more air than your ability to exhaust, otherwise you'll end up sucking conditioned air from inside your home into the attic.
I prefer passive methods of exhausting warm air, over powered options. Something about spending money to save money that makes no sense to me.
My favorite method is 'Nail Over Ridge Vents'. These are ideally located where the hottest air is, at the highest point. They also draft air over more rafter voids, preventing condensation.

My home is almost all hip, so I have two turbine style exhaust vents. I have them located as close to the peaks as possible, for efficiency.

If you decide to use a power ventalator, be sure to properly adjust the humidistat. If it runs all the time, you'll burn up the motor. It should just run during the hottest time of the day, for four to six hours.

I hope this helps.

wpageabc

Best to get the vents that turn on thier own. The motorized ones will make you crazy with the on off drive thermostat...

patt7638

Be sure to get one that requires no electricity. There was an attic fire in a house near me a few years ago when The electric motor in a fan over hearted.

Chief Shaway

I have a vent on the south side of the house and a thermostat controlled fan on the north side.
I'm sure roof vents would also help but don't want the added chance of a roof leak on my shallow sloped dormer roof.

CaptFun

After replacing 2 motors when I redid the roof at the old house I put in ridge vent and hardi soffit that is continuously vented all the way around. That kept it WAY cooler in the attic and I had lots less wasps up there.

He Dog

Ridge vent is great, but not a cheap retrofit. I have roof turbines and one has a solar powered fan. Attic hits 80F it turns on.

Toolman286

I use a thermostat controlled, powered roof vent on a 5/12 roof. It's wired with an over-ride switch so I can open the attic hatch & draw the cool air in the windows at night.

Rocky Raab

Solar vent fan. If the sun is shining, it's venting. Highly efficient, no cost to run, and not hard to install yourself. I faced mine west to get the maximum sun during the hottest part of the day.