International Association of Certified Home Inspectors
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| HVAC Topics include heating, venting, and air conditioning. |
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#1
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Hey all,
I keep seeing black stains on FG insulation and need to validate what I THINK I beleive it is... (sorry no photo handy) Common scenarios are in garages or outbuildings with VB installed but no wall or ceiling finish. I used to think this was soot that found its way through holes and overlaps in the VB and attached to the insulation now having condensation thereon, since it was fairly common in garages with wood stoves. Often newer similar buildings that have (or never had) combustible units (woodstoves, oil/gas furnaces). I'm stumped... help! Mike |
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#2
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Without picture it is difficult to tell (sometimes with picture), but most FG insulation I find that has black stains is from moisture.
Those that have never made a mistake have never done anything. Jack Gilleland Home Inspection Services Commercial, Multifamily, and Residential jgilleland1@att.net Ohio_Commercial and_Home_Inspections activerain |
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#3
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Please Note:
Brian A. MacNeish is a non-member guest and is in no way affiliated with InterNACHI or its members.
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I have many pictures of this phenomenon. I tell my customers when talking about energy conservation (airsealing) and possibly saving their roof sheathing from moisture/mould /rot "to lift up the fiberglass batts and at each dark spot/line on the lower side of the fiberglass batts will be a leak of air containing moisture and heat from below" Seal it!!! |
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#4
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The black stain marks are due to leaks in the ducting. For supply ducts, it's the venturi effect which sucks outside air into the ducting. Nothing serious, you might want to make a recommendation for duct sealing to improve the overall efficency of the system.
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#5
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Freedom Express Inspections LLC CMOR Thermography Certified Level 11 #2097 freedomexpressinspections.com freedomexpress495@att.net NACHI Member Okla. State DEQ Environmental Phase One Certified Master HVAC Mechanic (Retired) Certified Universal Freon by 40CFR 82 Sub-part F Professional Home Inspector State License # 130 Reporting system by Home Inspector Pro Serving the State of Okla. |
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#6
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#7
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Nice to know info for insulation. Thanks for sharing, I am sure it will come up and with your information this ensures proper answer for client
Regards Roger Frost Barrie Home Inspector Alliston Home Inspections Orillia House Inspector Barrie, ON (705)795-8255 |
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