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  #1  
Old 9/6/08, 7:08 PM
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Default Fire retardent OSB

Is fire retardent OSB typical in duplex dwellings? I find lots of FRT sheathing (plywood) in older duplex(s). I am pretty sure the blackness I found todayis mold/mildew although I want to be sure it is not charcoaling. Thanks everyone and long live NACHI
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  #2  
Old 9/6/08, 9:45 PM
Brian A. MacNeish Brian A. MacNeish is offline
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Default Re: Fire retardent OSB

Quote:
Originally Posted by mnicholet
Is fire retardent OSB typical in duplex dwellings? I find lots of FRT sheathing (plywood) in older duplex(s). I am pretty sure the blackness I found todayis mold/mildew although I want to be sure it is not charcoaling. Thanks everyone and long live NACHI
Looks like mould! Is it active now or was it just in the first year or so while the building dryed out from damp wood/concrete and excess mositure migrated to the attic.

I tell clients to check the attic in colder winter weather and call me if there is excess condensation/frost on the sheathing.....then we can work on the causes.
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  #3  
Old 9/6/08, 10:41 PM
jkogel jkogel is offline
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Default Re: Fire retardent OSB

There are attic moulds that are green or white when active and leave a black stain like in your pics after they die. Active molds of any colour can be wiped off with a finger, so that's a good test. Be careful scaring people when there's just a bit of old stain on the OSB. Call for improvements to ventilation if the soffits are blocked, weatherstrip seal on the hatch, stuff like that.

John Kogel
www.allsafehome.ca
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  #4  
Old 9/6/08, 11:14 PM
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Jeffrey R. Pope Jeffrey R. Pope is offline
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Default Re: Fire retardent OSB

What makes you think it's "fire-retardant" (resistant) OSB, as opposed to standard OSB?



IF YOUR INSPECTOR IS NOT USING THERMAL IMAGING, YOU'RE NOT GETTING THE WHOLE PICTURE ®
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  #5  
Old 9/6/08, 11:34 PM
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Default Re: Fire retardent OSB

Quote:
Originally Posted by jpope
What makes you think it's "fire-retardant" (resistant) OSB, as opposed to standard OSB?
I havent had much experience with Fire retardent OSB. I have seen quite a bit of FRT plywood that is deteriorated (looks black with white charcoaling). Just wanted to know if this new fire retardent OSB ( http://www.flamedxx.com/ ) does the same thing as FRT plywood deterioration.
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  #6  
Old 9/6/08, 11:36 PM
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mnicholet mnicholet is offline
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Default Re: Fire retardent OSB

Quote:
Originally Posted by jkogel
There are attic moulds that are green or white when active and leave a black stain like in your pics after they die. Active molds of any colour can be wiped off with a finger, so that's a good test. Be careful scaring people when there's just a bit of old stain on the OSB. Call for improvements to ventilation if the soffits are blocked, weatherstrip seal on the hatch, stuff like that.

John Kogel
www.allsafehome.ca
It is my understanding that mould (dead mould) can re-activate under the right conditions.
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  #7  
Old 9/7/08, 12:33 AM
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Christopher Currins Christopher Currins is offline
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Default Re: Fire retardent OSB

Quote:
Originally Posted by jpope
What makes you think it's "fire-retardant" (resistant) OSB, as opposed to standard OSB?
Asked again.



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  #8  
Old 9/7/08, 12:49 AM
jkogel jkogel is offline
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Default Re: Fire retardent OSB

Quote:
Originally Posted by mnicholet
It is my understanding that mould (dead mould) can re-activate under the right conditions.
Moisture, temp and food. There are mold spores in the air.

Last edited by jkogel; 9/7/08 at 9:59 AM..
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  #9  
Old 9/7/08, 2:07 PM
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Default Re: Fire retardent OSB

Quote:
Originally Posted by ccurrins
Asked again.
The charcoaling/deterioration of FRT plywood sheathing sometimes blends in with mold/mildew staining. I am curious if anyone has had experience with fire retardent OSB and if it blackens the same way as FRT plywood sheathing does when it starts to deteriorate from high attic temperatures.
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  #10  
Old 9/7/08, 3:55 PM
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Marcel R. Cyr Marcel R. Cyr is offline
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Default Re: Fire retardent OSB

Quote:
Originally Posted by jpope
What makes you think it's "fire-retardant" (resistant) OSB, as opposed to standard OSB?
Jeff, at least we know the product was manufacturered in 1996 August, but I do not see the Class "A" stamp anywheres.

Marcel
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  #11  
Old 9/7/08, 4:09 PM
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Jeffrey R. Pope Jeffrey R. Pope is offline
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Default Re: Fire retardent OSB

That's why I asked



IF YOUR INSPECTOR IS NOT USING THERMAL IMAGING, YOU'RE NOT GETTING THE WHOLE PICTURE ®
Jeff Pope
JPI Home Inspection Service
Santa Clarita CA
(661) 212-0738
Santa Clarita Home Inspection
http://www.MyInspector.net


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  #12  
Old 9/7/08, 5:04 PM
jkogel jkogel is offline
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Default Re: Fire retardent OSB

Quote:
Originally Posted by mcyr
Jeff, at least we know the product was manufacturered in 1996 August, but I do not see the Class "A" stamp anywheres.

Marcel
It is Exposure 1 classification, which is French Canadian for Class A. Just kidding, Monsieur Marcel.

http://www.osbguide.com/pdfs/EL812.pdf
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  #13  
Old 9/7/08, 6:29 PM
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Marcel R. Cyr Marcel R. Cyr is offline
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Default Re: Fire retardent OSB

Bonsoir, French Canadian? No Franco-American Yes.

I think that is just a fancy word for mutt in the Lingual World. ha. ha. That's what happens when brought up to close to my Canadian friends of New Brunswick.

Marcel
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  #14  
Old 9/7/08, 7:30 PM
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Carl A. Brown Carl A. Brown is offline
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Default Re: Fire retardent OSB

OSB = Mold candy



"I create controversy whether they like it or not"



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  #15  
Old 9/7/08, 7:54 PM
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Marcel R. Cyr Marcel R. Cyr is offline
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Default Re: Fire retardent OSB

Quote:
Originally Posted by cbrown1
OSB = Mold candy
And comes in colors too!

</IMG>








Brown mold on plywood roof sheathing



Marcel
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