MyFloridaCode.com

Mark, I thought <1 perm was a vapor "barrier" - and vapor "retarders" were >1 perm. I might be wrong though, a lot of terminology to remember.... It might be that the terms interchange with different publications.
 
Let me know what you think - I value your opinion.
 
Bob Koning

________________________________

From: codetalk-bounces at myfloridacode.com on behalf of Mark Cramer
Sent: Tue 2/2/2010 4:42 PM
To: codetalk at myfloridacode.com
Subject: Re: [Florida Code Talk] House Wrap



FYI, Typar is NOT a vapor retarder. It has a perm rating of 11.7.   Tyvek has a perm rating of 58.    (<1 is a vapor retarder)  

 

Tyvek began life as an air infiltration barrier, and is now an air and water barrier (if installed properly) on the outside of the sheathing. . .  .Older versions are not waterproof. Newer versions are. Neither are vapor retarders. 

 

Mark Cramer

Mark Cramer Inspection Services, Inc.

492 20th Ave. 

Indian Rocks Beach, FL 33785

727-595-4211

http://www.BestTampaInspector.com

 

From: codetalk-bounces at myfloridacode.com [mailto:codetalk-bounces at myfloridacode.com] On Behalf Of Bob Koning
Sent: Tuesday, February 02, 2010 10:51 AM
To: Ken Rodgers; codetalk at myfloridacode.com
Subject: Re: [Florida Code Talk] House Wrap

 

I would concur; I belongs on the outside of the sheathing. Placed behind, it would stop or restrict vapor at that point where it would condense and rot the sheathing

 

IMHO,

 

 

R.J.Koning - Director

Contractors Institute

rjkoning at contractorsinstitute.com

8301 Joliet Street

Hudson, Fl 34667

727-863-5147

 

 

 

From: codetalk-bounces at myfloridacode.com [mailto:codetalk-bounces at myfloridacode.com] On Behalf Of Ken Rodgers
Sent: Monday, February 01, 2010 7:07 PM
To: codetalk at myfloridacode.com
Subject: [Florida Code Talk] House Wrap

 

Has anyone ever heard of putting the house wrap on under the sheathing (OSB)?  I'm doing a siding replacement job where the lap siding had failed (can't remember the name of it but it had a class action law suit against it several years ago).  There are some spots where the siding allowed the OSB sheathing underneath to become saturated and thus rotten.  As we were removing some of the bad spots of sheathing to be replaced we found that the framing had been covered with TYPAR.   It's unfortunate that it wasn't on the outside of the sheathing as it would have made our siding replacement job MUCH simpler.  

 

I was just wondering if anyone had ever seen this done and if it was ever an accepted practice to do this or is this just another example of how NOT to build a house.  I know the code (703.2) states that the weather-resistant material will be applied over studs or sheathing but I'm pretty sure this is not intended to mean you can/should put it under the structural sheathing, right?

 

Thanks,

 

Ken