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Old 11-25-2012, 07:22 PM   #16
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Mold in the attic...


Yep, it doesn't take much to confuse me anymore.... pictures would help. Is there any air pathway from the ducting (along it's length) to the sheathing in the attic where the mold is?

Gary

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Old 11-25-2012, 07:39 PM   #17
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Mold in the attic...


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Originally Posted by GBR in WA
Yep, it doesn't take much to confuse me anymore.... pictures would help. Is there any air pathway from the ducting (along it's length) to the sheathing in the attic where the mold is?

Gary
I agree pictures are always good. I'm working right now so the pictures I have below are all I have for today. I can take more tomorrow. One picture is an exterior side view of the boiler room. The other picture is inside of the boiler room. Where I took the picture is where the tubing for the dryer crosses. It's no where's near the sheathing in that room, maybe 5-6 ft away from it. And it's not even close to the sheathing in the attic that has mold. But what I pictured is where the heat transfer from the boiler room to the attic, the area in the attic where the mold is growing.

Side note: the boiler room doesn't have mold on the roof sheathing of that particular room.

Mold in the attic...-image-2796216465.jpg
Mold in the attic...-image-1454460734.jpg
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Old 11-26-2012, 09:51 PM   #18
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Mold in the attic...


Is the warm, moist air from the boiler wetting the sheathing? Are they in-line? You need to air-seal the drywall on the walls/ceiling (and insulate) to stop the diffusion or possible air channel leak which is causing the condensation on the first-condensing-surface it reaches: http://www.buildingscience.com/docum...bout-diffusion

ADA the drywall: http://www.buildingscience.com/docum...wall-approach/

Stop the air leaks between spaces: Figs. 1-4: http://www.buildingscience.com/docum...apor-retarders

Gary
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Old 11-27-2012, 04:53 PM   #19
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Mold in the attic...


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Originally Posted by GBR in WA View Post
Is the warm, moist air from the boiler wetting the sheathing? Are they in-line? You need to air-seal the drywall on the walls/ceiling (and insulate) to stop the diffusion or possible air channel leak which is causing the condensation on the first-condensing-surface it reaches: http://www.buildingscience.com/docum...bout-diffusion

Gary
In the boiler room, not that I am aware of. I haven't seem any condensation drips or anything from that room. Only in the attic near that room where I recently closed off access. I have insulation in that area of the attic. I'd say 90% of the attic has unfaced insulation laying on top of very very old faced insulation. I did that because the owner of SeaShore Construction company told me to do so.

I noticed today that those 4 joists that I closed up, are not the only ones that could transfer air. However, the 4 I closed up in that section is the area where mold is growing. I hate this house.

Curious question: Do they make a paper based vapor retardant? Like the paper that's on faced insulation? I asked because I have that unfaced insulation up there but maybe the faced insulation underneath should've just been replaced altogether.
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Old 11-27-2012, 09:45 PM   #20
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Mold in the attic...


There is asphalt coated paper faced batt. The moisture is coming from somewhere directly below the area. Check for a bath fan duct with a hole, dryer duct hole, gas appliance exhaust ducting hole = excessive moisture. It has to somewhere, don't give up! Use a rake to remove some insulation over the exterior wall under the moldy area. Wiring hole through the top plate running down to the crawlspace/basement with moisture rising on the "stack effect"; http://www.wag-aic.org/1999/WAG_99_baker.pdf

Here, I'll help you look: http://www.finehomebuilding.com/PDF/Free/021105092.pdf lol.

If that back entrance is heated (how, what type), it could be melting the roof snow, but not the moisture issue.

Gary
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Old 11-28-2012, 09:54 AM   #21
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Mold in the attic...


Quote:
Originally Posted by GBR in WA View Post
Is the warm, moist air from the boiler wetting the sheathing? Are they in-line? You need to air-seal the drywall on the walls/ceiling (and insulate) to stop the diffusion or possible air channel leak which is causing the condensation on the first-condensing-surface it reaches: http://www.buildingscience.com/docum...bout-diffusion

ADA the drywall: http://www.buildingscience.com/docum...wall-approach/

Stop the air leaks between spaces: Figs. 1-4: http://www.buildingscience.com/docum...apor-retarders

Gary

Insulation is one solution, ventilation is the other. If the room were un-used for anything other than a boiler, wouldn't it be more simple and effective to install some adequate breather ventilation and just evacuate that moist hot air, rather than trapping it inside?
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Old 11-28-2012, 07:33 PM   #22
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Mold in the attic...


Ventilation is fine but I'd find the source of the moisture first...if it is that room. Look at the water stains on the inside roof sheathing. I suspect their is no air supply to the boiler, is it gas fueled (note the "B" vent above on exterior pics)? Does it have air supplied high and low or is it required (H2O by-product of combustion)? Still checking if solid blocking between boiler room and house attic. Help find the source, then add venting after air sealing (localizing) it, would be my plan of attack, your thoughts?

Gary
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Old 11-30-2012, 12:23 AM   #23
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Mold in the attic...


Quote:
Originally Posted by Grumpy

Insulation is one solution, ventilation is the other. If the room were un-used for anything other than a boiler, wouldn't it be more simple and effective to install some adequate breather ventilation and just evacuate that moist hot air, rather than trapping it inside?
That is a good idea. Never thought of that before. However, come spring time I plan on replacing the roof on the boiler room and the roof on the room with the metal heat exchange and sealing off the attic to that area of the house.

Quote:
Originally Posted by GBR in WA
Ventilation is fine but I'd find the source of the moisture first...if it is that room. Look at the water stains on the inside roof sheathing. I suspect their is no air supply to the boiler, is it gas fueled (note the "B" vent above on exterior pics)? Does it have air supplied high and low or is it required (H2O by-product of combustion)? Still checking if solid blocking between boiler room and house attic. Help find the source, then add venting after air sealing (localizing) it, would be my plan of attack, your thoughts?

Gary
Well based on visual appearance of the roof during snow storms and where the mold is in the attic, it is clear that moist air is getting to that area from that room. In the boiler room it does look like there was a severe water leak at some point in that rooms life between the walls and the sheathing. I do know the sheathing wasn't really replaced when I had the roof redone in 2010. They just put knew sheathing on top of the old. The boiler does reside in a room with open access to the crawlspace. No real ventilation in that room, at least none on the roof of that room. It is a gas boiler. The way it looks the vent piping for the boiler has condensation that falls back down to the boiler with a pump connected to it. Now the my boiler is running, ill check to see the sheathing in that room has any type of condensation. But as stated before I do plan on redoing that particular roof in spring. When I do I will seal all connections to the attic and ventilate that room somehow. Not sure how yet.

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