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Old 07-06-2012, 05:37 PM   #16
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enough ventilation?


I hope that it helps that they are IC energy effecient air lock type. Plus they are never on anyway.

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Old 07-07-2012, 09:32 AM   #17
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enough ventilation?


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Originally Posted by Mikegp12 View Post
I hope that it helps that they are IC energy effecient air lock type. Plus they are never on anyway.
Being airtight does help considerably as well as not being on and hot.

The nagging issue in these cases is the lack or R-Value at those locations because of the reduced depths of insulation.

The air loss is the biggest issues and that is handled by the airtight can if installed properly (that is always questionable) so you are ahead of the game in that case.

Most vaulted ceilings are seriously lacking in both venting and insulation depth so I would plan on always having some melting issues on that roof until you rip it off and spray foam the whole thing.
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Old 07-07-2012, 12:32 PM   #18
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enough ventilation?


I hope builders and buyers learn more about these problems. I admit I knew nothing about attic venting until I started looking to replace the roof due to hail damage.. And evidently the builder, roofer, insulator,sider, architect and inspectors either didn't care or didn't know to do this right when the house was built in 2004.
I can't justify tearing everything off and starting over because my heating and cooling bills are very reasonable and there are no signs of moisture problems.
I have one area of ice damming that I will install heating cable as a easy if not perfect fix. Oddly, the only ice dam area is where there is NO overhang.

Thanks to all for your valuable information.
Mike
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Old 07-07-2012, 08:50 PM   #19
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enough ventilation?


That ice dam isn't near a bath fan roof termination is it? Or a plumbing stack vent....

That said, I'll leave you with some light reading; http://www.jlconline.com/cgi-local/v...170a32100a05c7

http://www.professionalroofing.net/a...2/feature2.asp

Keep an eye on any signs of moisture on roof sheathing, etc; http://www.buildingscience.com/docum...bout-diffusion

Gary
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Old 07-08-2012, 08:24 PM   #20
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enough ventilation?


Thanks GBR. That was a very interesting article at www.jlconline.com. Makes me feel a little better about my situation.

Is there a way air seal ceiling fan boxes from inside the house ??

Thanks,

Mike
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Old 07-13-2012, 12:30 AM   #21
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enough ventilation?


You could caulk/foam around them, and foil tape inside on the extra holes to the attic.

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Old 07-13-2012, 02:00 PM   #22
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enough ventilation?


I have attached a picture taken from the attic above the garage. You can see there is a triangular section of plywood sheathing at the peak of where the garage meets the house attic. It seems like this would really impair air movement between these areas. Can any expert framers tell me if this is structural or there for a reason.
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Old 07-14-2012, 11:37 AM   #23
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enough ventilation?


Don't cut that out.

It is bracing and stabilizing the top chords of those trusses.

You could just cut some small circular vents in spaces between the trusses and you will not weaken that bracing at all.

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