"Vapor Barrier" Interior Paints

selder · Post by **selder** » Wed May 23, 2012 1:51 am -1100

I'd like to add an interior paint coating to a wall assembly but can't find the material data in the database (WUFI Pro5.1).

Benjamin Moore's product is "Super Spec" prmer with a perm of 0.5 at 1 mil thick.
Glidden paint's comperable product is stated to be: .6 perm at 1.5 mil thick.
I've read genralizations that vapor retarder paints offer a .45 perm rating.

So my question is, what data do I enter into the material database?..
Do I only worry about permenace?.. what value should I use.?

or..Is there a product already in the database I'm not seing.?.
Thanks.

Manfred Kehrer · Wed May 23, 2012 3:01 am -1100

Hello selder,

yes only the permeance is of interest. You can handle this if you add a additional perm value at the surface transfer conditions.

selder · Post by **selder** » Wed May 23, 2012 3:06 am -1100

perfect..thank you