Modeling Smart Vapor Retarder using moisture dependent permeability

[Kenner]

Hi,

I'm attempting to model a smart vapor retarder (specifically the Intello Plus manufactured by 475 High Performance Building Supply). The product specification sheet states that the vapor retarder has a vapor variability of < 0.13 perm during dry winter conditions, and > 13.2 perm during summer conditions to increase drying potential. The DIN EN 1931 Perm rates are listed in the specification from 13.20 to <0.13 (Sd value from 0.25m to >25m). The ASTM E96 (dry cup/wet cup) values for vapor variability are 0.2 perm to 6 perm.

Working in IP units, I'm wondering how to interpret this information in order to input RH values and permeability (perm-in) so that I might be able to model this vapor retarder's behavior. I realize that this might be simple question of unit conversion, but I am hoping someone might be able to help me work through it.

Thank you for your time.

Best,

Kenner

[Christian Bludau]

Hi Kenner,

you may have to transfer the units. See here for information about doing that, they have a nice diagram on page 4:
www.builddesk.co.uk/wp-content/uploads/ ... tances.pdf

Christian

[fkbuisman]

Hi Kenner,

INTELLO Plus is listed as a material in the North American as well as the regular Fraunhofer database.
No need to make this material yourself. use it as 1mm thick noted in the material file.

Floris