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Old 05-24-2013, 09:22 PM   #16
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Excessive HEAT in Attic


You are in Zone 4; http://publicecodes.cyberregs.com/ic..._11_par002.htm

Code requires R-30 ceiling: http://publicecodes.cyberregs.com/ic..._11_sec002.htm

Do you have a full attic or knee-wall and top attic with cathedral (sloped) ceilings;pp. 10, 11; http://www.awc.org/pdf/WCD1-300.pdf

Attic air sealing; first, insulation; second, ventilation; third.
How to post a picture, first group on the list; http://www.diychatroom.com/f98/
or describe the attic/rafters better.


Gary
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Old 05-24-2013, 11:12 PM   #17
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Excessive HEAT in Attic


What are these baffles before foam insulation underside of roof. Where do you look for air leaks?
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Old 05-25-2013, 01:16 AM   #18
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What are these baffles before foam insulation underside of roof. Where do you look for air leaks?
For air leaks, anywhere that you have a access hatch, whole house fan, wires entering the attic through the walls, pipes, chimney's, etc.. As for the baffles, they are foam, and placed at the edge, where roof meets ceiling of the living space, so that even if you do not have soffit's in your home, it allows air to come up through into the attic, for better ventilation.
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Old 05-25-2013, 07:55 AM   #19
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Excessive HEAT in Attic


Baffles normally allow a channel of air kept open down to the soffit vents, so they don't get covered by insulation. But when the underside of your roof is coated with foam, they serve another purpose - to keep a cushion of air to buffer the shingles from overheating. If the sun beats on your shingles and the heat is trapped, it can cause premature wearing of your shingles.
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Old 05-25-2013, 08:46 PM   #20
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Excessive HEAT in Attic


were I live foam sprayed on the sheathing of a roof in the attic is a major code violation. Not alowwed to do it will cause very premature roof failur at best.
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Old 05-25-2013, 09:55 PM   #21
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Where are you located, Nailbags?


mj12, are these rafters with drywall attached or open attic; insulation on ceiling joists/floor?

Gary
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Old 05-25-2013, 10:00 PM   #22
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were I live foam sprayed on the sheathing of a roof in the attic is a major code violation. Not alowwed to do it will cause very premature roof failur at best.
Very premature roof failure at best. Hmmm. I shudder to think what might happen at worst. Immediate explosion of the premises?

And you live in Pacific Northwest, where it isn't hot.

Sounds rather exaggerated to me. It shouldn't be a code violation at all if baffles are in place. And if they're not - then code violation or no, there's certainly nothing worse going to happen where you live than in more difficult climates.
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Old 05-26-2013, 01:23 PM   #23
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Excessive HEAT in Attic


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Soffit vents alone don't do any good.

Exactly. Ambient air enters the soffit vent, and exits at the top of the roof. With only an air inlet and no air exit, you don't have any ventilation for your attic. Sounds like you already have one quote for adding roof vents. Call at least one other roofer, and just say "I am not sure if I have sufficient attic ventilation". You may find different roofers have somewhat different opinions on how best to ventilate the attic (i.e ridge vent, whirly-birds, etc). I am figuring the salesman should be asking to go up into your attic to check that the soffit vents are not plugged (its too common that people insulate their attics and stuff insulation over top of the soffit vents).
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Old 05-26-2013, 01:32 PM   #24
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were I live foam sprayed on the sheathing of a roof in the attic is a major code violation. Not alowwed to do it will cause very premature roof failur at best.
Correct, should be applied to the ceiling area of the living space, if the attic is not going to be used as living or finished space for storage. Otherwise, you apply per directions at http://www.icynene.com/

Remember, it is the heat from underneath that causes breakdown, along with if you do not have shade above, beating sun will cause breakdown. We also discussed the subject of Spray foam for attics, back in 2008 Air cavity required behind spray foam roof insulation
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Old 05-26-2013, 06:13 PM   #25
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Excessive HEAT in Attic


Insulating the attic from conditioned space will work the best; R-38 is required per code for your Zone4;http://publicecodes.cyberregs.com/ic..._11_sec002.htm

This will stop/slow 98% of the heat flux; http://www.google.com/url?sa=t&rct=j...,d.cGE&cad=rja

Radiant/with venting stops/slows 28%; http://www.rfoil.com/pdf/8-Effect-of...erformance.pdf

I would air-seal the attic first, add code minimum insulation R-value; http://www.google.com/url?sa=t&sourc...wWATQw&cad=rja

http://www.finehomebuilding.com/PDF/Free/021105092.pdf

Ventilate the attic better if showing signs of excessive heat/moisture in attic framing/on shingles. http://www.professionalroofing.net/a...2/feature2.asp

At least to code (minimum); http://publicecodes.cyberregs.com/ic...9_8_sec006.htm

Use a fan only if the air path from soffit/ridge is restricted (hips/valleys/dormers/etc.) http://www.greenbuildingadvisor.com/...tilators-green

Is any HVAC duct/unit in attic?

Gary
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Clean the dryer screen in HOT water if using fabric softener sheets.
They leave a residue that impedes air-flow, costing you money.
Clean the ducting in the last six months? 17,000 dryer fires annually!
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Old 05-26-2013, 07:20 PM   #26
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Excessive HEAT in Attic


I had a similar problem a long time ago. The upper attic (tri-level home) would get extremely hot during the summer. I added extra insulation which helped quite a bit but I needed to do more. Extra soffit vents helped again, but since my roof shingles are brown the sun really heats them up. I decided to install a power attic vent and have been monitoring the attic temps with a remote thermometer sensor. On hot, sunny days it used to get above 125 routinely. Now with the addition of the power attic vent it stays around 105-107 at the highest. The only issue I had was when a raccoon decided to climb into the attic through the power attic vent. It tore off the screening around the edge and then bent one of the fan blades and jumped down into the attic. In the first pic you can see one of the fan blades bent down. I could hear it walking around up there one night so I went to my local police department animal control office and borrowed a trap. Baited it and stuck it up there but never caught it. I was lucky in that I placed it directly underneath the attic fan and it used the trap as a sort of ladder and apparently climbed out on it's own. After that I bought some heavy gauge mesh and secured it to the underside of the fan opening. Nothing is getting through that. (knocks wood).
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Old 05-27-2013, 08:43 AM   #27
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If you are not going to treat the attic as conditioned space, there is zero reason to insulated the roof deck.

Get the venting figured out and if you have soffits (albeit unclogged or obstructed) vents, a proper soffit-ridge combination will work perfectly when done right.
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Old 05-27-2013, 02:27 PM   #28
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I have seen guys take 2 inch foam board and attach it flush with the bottom of the attic rafters. They leave an 1/4 inch gap on each side and then spray foam everything together. I guess that is the same as installing baffles and spray foaming the ceiling. Would you also use baffles on a south facing wall if it was going to get spray foamed as well?
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