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Old 06-04-2010, 11:19 PM   #1
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Flexwrap with grade D building paper?


Can Flexwrap be used with grade D building paper? This is for a house that will be stucco'ed. Flexwrap looks like a great (and easy to use) product for flashing door and window pans, but I assume that since grade D paper contains asphalt, and Flexwrap is butyl based, those 2 products are incompatible. If that's the case, is there any product like Flexwrap that can be used with grade D building paper?

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Old 06-05-2010, 05:55 AM   #2
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Flexwrap with grade D building paper?


separate the flex and the paper with a strip of tyvek if your not sure


Last edited by Tom Struble; 06-05-2010 at 05:58 AM.
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Old 06-05-2010, 12:58 PM   #3
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Flexwrap with grade D building paper?


Tom's correct.
Excellent adhesion performance
Butyl adhesive performs through extreme temperatures
Adheres to most common building materials”---- phone number at the end, must be used with their other weatherization products for the 10 year warranty: http://www2.dupont.com/Tyvek_Weather...20Bulletin.pdf


Or, research other products.


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Old 06-06-2010, 04:19 PM   #4
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Flexwrap with grade D building paper?


I never thought of putting Tyvek in between... great idea! Looks like DuPont supports the use of Tyvek on top of building paper as well.

Thank you guys!

BTW - I did some research on like products that would not be butyl based (to avoid the chemical incompatibility issue) but did not come across anything like Flexwrap. Maybe I am thinking too much of Flexwrap right now (I haven't used it yet) but I checked videos on Youtube and it looks like a really easy product to use...
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Old 06-07-2010, 07:16 PM   #5
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Flexwrap with grade D building paper?


wait till you check the pricegreat product really
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Old 07-22-2010, 02:42 PM   #6
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Flexwrap with grade D building paper?


I recently spoke to Dupont about this issue and while they wanted me to use tyvek, they said that it would be "acceptable" to use flexwrap with asphalt impregnated building paper, but were concerned about the building paper deteriorating.

Here's what they said:
" Our flashing tapes were designed for optimum adhesion to Tyvek® weather resistant barrier products, as well as most common building materials such as OSB sheathing, wood and or steel stud.We have done very limited adhesion studies with conventional asphalt impregnated building papers and have not noted any particular compatibility issues.

However, our experience from field observations indicate that these asphalt papers tend to degrade and break
down over time, which could compromise the integrity of the moisture barrier if our flashing products are adhered
directly to it.

Therefore we would suggest that the flashing materials be adhered directly to the sheathing in most cases rather
than to asphalt building paper."

Now, that said, I cannot seem to find Grade D building paper and every supply house/lumber yard I call seems to have NO clue even as to what it is. They all end up directing me to use tyvek....

I did talk to one guy at Allied building supply that found Jumbo Tex paper from Fortifiber, but he said it was all out on the West coast. I am in Maryland, why has no one heard of Grade D building paper? Fortifiber's distributor for the NE is www.russinlumber.com and they say anyone can order it. Allied said they can get some sent UPS, but didn't seem thrilled.


FYI I am using it under vinyl siding.

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