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Old 12-29-2011, 12:54 PM   #16
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OSB Roofing Wetness


GBR in WA

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Old 12-29-2011, 03:59 PM   #17
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OSB Roofing Wetness


Ah, ok. Duh! Thanks!
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Old 12-30-2011, 12:00 AM   #18
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OSB Roofing Wetness


My ears are burning...... thanks, Jk!

“How bad is this? I just bought a vent filter to install, and after the builder looks at it tomorrow, I plan on having it sealed up tight. I also plan on removing the bird screen that covers the vent because a lot of lint gets caught up in that (there's still a flapper).

Is there anything else I should do?”-------- Is that an in-line vent filter? In the room, to trap the majority of lint the dryer’s filter missed? I would suggest that when using a long-run sidewall termination or roof termination.
“Sealed up tight”, means roofing over the vent hole? Exhausting somewhere else?
Or using the proper roof termination hood rather than the pipe sticking through the roof?
Screens are a “no-no”, as are screws in the ducting.

Which type/style of hood will you be using? Post a picture of the current one, if possible.

The OSB will dry by itself, taking a lot longer than plywood. Clean the mold starting with laundry detergent and water; don’t get it too much wetter…. I wouldn’t use bleach for a few reasons.

If the wetness has saturated the OSB and it is on an end joint between sheets, you will get irreversible edge-swelling that will probably show on the roofing surface if asphalt shingles; pp. 1, 2, and fig. 4 (vents) here; http://www.ewpa.com/Archive/2006/aug/Paper_266.pdf

The flapper stays to keep cold outside air from entering the ducting thus lowering the (insulated) ducting temperature to condense warmed moist air from the dryer on its walls. This wet duct inside collects lint- effectively (and required by code).


As already said but not answered: Is that ducting going through the roof rather than into a termination hood pipe mounted on the roof surface?




Gary
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Old 12-30-2011, 08:55 AM   #19
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OSB Roofing Wetness


Gary (and all),

Yes, the ducting is going through the roof and *not* into a termination hood pipe mounted on the roof. There is a vent up there with a flapper, but it's just missing the termination point.

There have been numerous issues with this and many have been identified in the thread. I had the builder come by yesterday and take a look at it. He saw all the pictures and water/moisture, and took a look up in the attic. Part of the problem is that if the pipe is too low (not all the way through the roof), dryer air escapes and vents into the attic. If the pipe is too high, it will hold the flapper open and allow cold air and rain to come in from outside.

I'm happy that we came to a fix that will be to cut out the bad plywood, and replace it and patch the roof and lay new shingles in that area. Then, reroute and vent the dryer through the gable. I was going to do that myself because I don't have a good feeling about how the vent was installed in the first place. But if the builder is going to do it for me, that's one less thing I have to do.

I ended up buying an 'air king' in line vent to install. I think I'm going to hold off on installing it until after all this is done. Some of the lint traps say that you can't use it for gas, but this one doesn't say anything about it. Is it a code violation for using one on gas? Here is what I bought.

http://www.amazon.com/Air-King-AILT4...5252990&sr=8-1

Also, this is a picture of what the vent looks like. It's not the same exact vent, but it's a picture I found that is similar to it.

http://www.nachi.org/images10/1-20-3.jpg

Finally, thank you for the PDF. A picture is worth a thousand words.

Thanks again for all your help here.
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Old 12-30-2011, 09:31 AM   #20
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OSB Roofing Wetness


http://www.dryerbox.com/dryer_venting_guide.htm
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Old 12-30-2011, 10:33 PM   #21
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OSB Roofing Wetness


Check with your local AHJ on the dryer lint box, some areas recommend them, fig. on page #9: https://docs.google.com/viewer?a=v&q...LlJ81BbiC1bp2A


Install a Type “A” termination hood outside the gable for 50% more air-flow (door opening) than a Type “B”. I would use the single flapper door rather than the multi-door where more lint could build-up: http://www.appliance411.com/faq/dryer-vent-length.shtml

Add this to joecaption’s site for more safety; you can never be too safe with dryers: http://www.ashireporter.org/articles...es.aspx?id=161

In answer about that roof hood style:

Gary

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