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How to supplement ridge vent?

Old 07-10-2013, 06:21 AM
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Default How to supplement ridge vent?

I bought my house a couple of years ago and it already had an almost brand new "professionally" installed roof. When the roof was redone it's obvious that they removed a few whirlybird roof vents and went with a ridge vent system. The problem I'm having is that the ridge vent does a terrible job ventilating the attic. Before you ask the soffits are vented for air intake and not obstructed, and I think one of the reasons the ridge vent system isn't working is because the roof is a hip roof thus the length of the ridge is shorter.

The attic gets too hot and is baking the 2nd floor of the house. I need ideas to supplement the attic ventilation but I'm concered I'll just pulling air inside through the ridge vent. Any pointers are appreciated here.
Old 07-10-2013, 06:37 AM
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put in a few whirlybirds
Old 07-10-2013, 06:52 AM
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Originally Posted by WPBTH View Post
put in a few whirlybirds
+1 I changed to ridge vents on the previous reroofing project but with less than adequate ventilation last year I changed back to the turbines. It could be that the lower pitch roof did not create enough draft, prevailing wind direct, etc but for what ever reason the ridge vents did not work on my house.
Old 07-10-2013, 06:53 AM
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Or install an attic vent fan. Set the thermostat and let it run.
Old 07-10-2013, 07:04 AM
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any proper vent installed
Old 07-10-2013, 07:29 AM
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I am currently having a solar vent fan installed. ridge vents are shit
Old 07-10-2013, 07:31 AM
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Originally Posted by WPBTH View Post
put in a few whirlybirds
Awesome!
Old 07-10-2013, 07:34 AM
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Why not cut in an attic fan, or two if the roof's large enough?

They are easy enough to put in and will do a great job.

Or, rip off the ridge vent system, cut it back more and finish it off again to let more air flow if you don't want attic fans.

Good luck.
Old 07-10-2013, 07:40 AM
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A passive solution would be to rip back the ridge and build a Boston vent system. I used them for years with great results. Guessing with a hip roof you have no gable ends for an attic vent...?
Old 07-10-2013, 01:26 PM
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The hip roof has no gable ends. I'm not opposed to putting in a roof fan but I'm conerned I only be pulling in air through the ridge vent and out the fan, while short circuiting the rest of attic.
Old 07-10-2013, 02:02 PM
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Originally Posted by bjm9818 View Post
Or install an attic vent fan. Set the thermostat and let it run.
This! I had a power vent on my house. Reroofed with ridge vent, and left power vent. It runs less, but still runs. That tells me it's still needed.
Old 07-10-2013, 07:18 PM
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X3 on attic fan/power vent.
Old 07-11-2013, 02:49 AM
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Balanced roofing ventilation system has a 1/300 net free ventilation. In other words one square foot of ventilation for every 300 feet of attic space. 50% intake and 50% exhaust. Sounds like you got the "in" but not the right amount of "out." Surprised they didn't use a few 4' off ridge vents for a hip. What's the slope?
Old 07-11-2013, 03:40 AM
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Originally Posted by mobjack22 View Post
X3 on attic fan/power vent.
x4

attics I've been in are noticeably less hot than non power vented.
Old 07-11-2013, 05:37 AM
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If you do not have adequate soffit vents your wasting time and money!

John
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Old 07-11-2013, 06:00 AM
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Do not assume the soffits are good-to-go. I've come across all sorts of issues with attic ventilation through the years. On one house, someone came up with the wonderful idea to use soffit material at the gable end exhaust. Looked great....but slowed ventilation. When I took it off, the hot air escaping nearly knocked me off the ladder.

They, supposed professionals, do crap all the time that stops the flow. On several I've found blown insulation right in the soffit air path. This is one of the 1st places I'd look. They have formed ventilation devices that need to be installed before insulation is installed but most are too lazy to install them or maybe just don't care. Either way, review jtburf's diagram above and stay on it until everything is clear, then consider a power vent if it's still needed.

Also, the ridge vent manufactures have calculations on their sites to determine how much ventilation is required. Once all is clear, you can see how much more, if any, is needed.
Old 07-11-2013, 01:58 PM
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florida power and light and many other groups say to spend the money on insulation, no power vents, ensure good soffit intake.

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