Replies

1. 
   Piffin | Mar 01, 2007 11:53pm | #1

   Tyvek is not a VB.

   Which you use depends on much of the other detqails of your climate, insulation type, and the rest of how the house is built.

    

    

   Welcome to the
   Taunton University of Knowledge FHB Campus at Breaktime.
    where ...
   Excellence is its own reward!

2. 
   MikeHennessy | Mar 01, 2007 11:54pm | #2

   I note you are in Philly -- my condolences!  ; - )

   As the topic of your post implies, you need a vapor barrier on the inside of your walls. Tyvek does not a vapor barrier make. To the contrary, Tyvek is designed to allow water vapor to pass through. I'd suggest you use 6 mil poly, caulked at the margins and taped at the seams.

   Mike Hennessy
   Pittsburgh, PA

1. 
   neilpuck | Mar 01, 2007 11:57pm | #3

   Then, thats what it shall be!  Thanks, I was pretty sure, but a quick post would confirm my thinking. 

   Hey.....no Philly bashing!!!

   At least we've won a........  shoot.

   Well at least OUR mayor.......shoot..

   At least we get less snow!!!

1. 
   DanH | Mar 02, 2007 12:14am | #5

   Well at least Frank Rizzo isn't around any more. (Is he?)
   So convenient a thing it is to be a reasonable Creature, since it enables one to find or make a Reason for everything one has a mind to do. --Benjamin Franklin

1. 
   neilpuck | Mar 02, 2007 12:21am | #6

   I think we have a Frank Rizzo Jr floating around. 

1. 
   DanH | Mar 02, 2007 12:50am | #7

   Floating in the Schuylkill would be ideal.
   So convenient a thing it is to be a reasonable Creature, since it enables one to find or make a Reason for everything one has a mind to do. --Benjamin Franklin

3. 
   DanH | Mar 02, 2007 12:13am | #4

   No obvious reason to not use plastic. Tyvek will work about as well to stem additional air infiltration, but is not a vapor barrier (as others have said).

   My take, though, is that in Philly you **probably** don't NEED an additional vapor barrier, especially if the fiberglass is faced. Won't do any harm, though.

   So convenient a thing it is to be a reasonable Creature, since it enables one to find or make a Reason for everything one has a mind to do. --Benjamin Franklin
1. 
   rez | Mar 03, 2007 07:31pm | #10

   " you **probably** don't NEED an additional vapor barrier, especially if the fiberglass is faced. Won't do any harm, though. "

   Well, not attempting to contentious or anything but there is always the possibility of inadvertently constructing a double vapor barrier by placing poly on top of the FG batt impregnated facing if that facing doesn't receive diagonal slash cuts a couple inches apart prior to the placement of the poly.

    

   be for what it's worth 

    

   every court needs a jester

1. 
   DanH | Mar 04, 2007 05:20am | #11

   Two adjacent vapor barriers will not do any harm, especially if the outer one (in cold climates) is "weaker" (as is true of FG facing vs plastic sheeting).It's not "double" vapor barriers that causes trouble, it's having a vapor barrier on the cold side.
   So convenient a thing it is to be a reasonable Creature, since it enables one to find or make a Reason for everything one has a mind to do. --Benjamin Franklin

1. 
   rez | Mar 04, 2007 06:09am | #12

   Must be I'm still living in the '80s.

    And all this time people been accusing me of still being in the '70s 

    

   every court needs a jester

4. 
   woodroe | Mar 03, 2007 04:34am | #8

   Are you allowed (by code) to use tyvek behind stucco in PA? They don't allow it in MN.

1. 
   precision | Mar 03, 2007 05:11am | #9

   Tyvek makes a Stuccowrap for that purpose.