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 Post subject: Materials inputs for WUFI mold index
PostPosted: Mon Feb 05, 2018 9:35 am -1100 
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WUFI User
WUFI User

Joined: Thu Oct 19, 2006 5:27 am -1100
Posts: 92
Many of the product/material selections within the WUFI mold index tool are named for, what I assume, is the European market - for instance, what does the product "Pure gypsum or lime render" refer to? - what is the equivalent product in the USA? Would a gyp board product that has been treated to resist mold be the equivalent? Or, would "Gypsum render with organic compounds" more closely resemble a gyp board product?

There are other products such as "PUR products" and "PU insulation with aluminum foil" that from the USA standpoint are not known either. Any insight into what these products are would help utilize the VTT tool.

Thanks!

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Respectfully,

Michael Hurd


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 Post subject: Re: Materials inputs for WUFI mold index
PostPosted: Tue Feb 27, 2018 8:59 pm -1100 
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WUFI SupportTeam IBP
WUFI SupportTeam IBP

Joined: Tue Jul 19, 2005 2:50 am -1100
Posts: 104
Location: Fraunhofer IBP, Holzkirchen
Michael,

the VTT model comes originally from Finland! Of course investigations were performed with products typical or available in that country. However most of them can be exemplary for other buildings materials.

Most interior reanders are made of gypsum - however if they contain cellulose fibres they get more sensitive than pure gypsum. In old buildings you often find lime renders. The gypsum board offers a better nutrient qualitiy to to the paper / cardboard surface. If specially treated of course properties change!

PUR is insulation foam - should be available in the US also. Aluminium as vapor barrier film on the surface also...!?

But you're right, the difficulty is to decide which surface properties should be used. ASHRAE 160 containt some proposals. They will be implementened as default values in WUFI mold index soon!

best regards
Daniel

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Daniel Zirkelbach, IBP Holzkirchen


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 Post subject: Re: Materials inputs for WUFI mold index
PostPosted: Fri Jun 08, 2018 5:06 am -1100 
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WUFI User
WUFI User

Joined: Mon Jan 16, 2006 9:42 am -1100
Posts: 20
Location: Boston, MA - USA
About the implementation of ASHRAE 160 into the mold index, it is certainly faster than our previous method of setting monitors, exporting run data, and importing into a spreadsheet. However, two awkward issues remain: 1) the drop down list of materials has no reference as to their respective sensitivity until you pick something; 2) when you select user input, you are still stuck with the last material name selected. This is generally confusing for our clients because the material name is not the model material. I suggest having the user input either select the layer name from the graph or allow the user to input the material name so we get results that are consistent with our models.

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Ned at SGH


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 Post subject: Re: Materials inputs for WUFI mold index
PostPosted: Fri Jun 29, 2018 4:30 am -1100 
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WUFI International Support Team
WUFI International Support Team

Joined: Thu Mar 10, 2005 2:17 am -1100
Posts: 324
Location: Northbrook, IL; USA
Yes Ned, I agree with you that the current implementation is confusing. I am working with my German colleagues to improve this.

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Manfred
Wiss, Janney, Elstner Associates, Inc.
Official WUFI® Collaboration Partner for USA/Canada
Enjoy WUFI® :) .... It is easy and complex.


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