WUFI

Hi,

I have the next build-up with water repellent and foil faced PIR in both sides modelled as vapor retarder (sd=1500).

is it right?

101.PNG

Evaluating the WC in the PIR I have observed irregular, non-periodic changes in the total water content what makes me think that something can be wrong ...

Could the "Assessing the Risk of Interstitial Condensation Runoff" guideline be applied for a foil face PIR insulation which is between an unventilated cavity and concrete? what would it need to be modified in the definition of a foil faced PIR in WUFI due to low-emissivity (low-e) surface of ...

Thanks once again for your explanation. I really appreciate it.

1- If I follow the guideline on “Assessing the Risk of Interstitial Condensation Runoff,” what minimum RC value should I consider? I ask because I do not have a water- and vapour-tight surface in my assembly, and I do not consider it ...

thanks for the reply once again.

what is the difference between Aluminum bright, wet and dry? they have different long-wave emissivity.

should I keep checked the option "Simulation take rain into account"? As the aluminum panel will not absorb rain at all. this idea is also shared here... https ...

Hi,

how should I model the aluminum panel in WUFI ?

should I uncheck "Simulation takes into account" and defining proper short-wave absorptivity? what about "additional diffusion resistance" and heat transfer coefficient?

thanks. i appreciate your help

thanks for the reply.

the image is an error so my bad...you can delete it to avoid confusion for people reading the post.

My wall has got cellulose between I joist + woodfibre to the exterior so, does the guideline apply just for ETICS systems with wood fibre insulation?

hi,

What can make a risk for sheathing board to have strong ventilation in a location like london for the general ventilated roof from the guideline "Guideline for the Calculation of Ventilated Pitched Roofs"? moisture accumulation in the sheathing board layer due to air carrying high moisture from ...

thanks for the reply, but, is it correct to follow "Guideline for the Calculation and Evaluation of an ETICS with Wood Fibre Insulation" for the build-up assembly that I have?

Plasterboard
38mm Service void, formed with battens
OSB3 as airtightness layer
300mm ‘I’ Beams filled with Warmcell ...

But, is it realistic to add that source of rain leakage in that particular position if I suspect to have poor workmanship, a failure of the weatherproofing details or being in the worse scenario?

thanks but the error is showed when I define the reduction factor for the coldest and warmest position of a ventilaed roo so, I add user defined reduction factors

Hi,

Thanks for you reply. i have followed that guidance.

Could you add a screenshot where to find that ""Reduction Factors" drop-down menu" as I select User-defined?
Regards

Hi,

I got a message about parameters that I have defined previously but, the software detects as an error...so my concern is if the results will not be accurate...
in terms of ach, what is the range of ach for a pitched roof with strong, normal and low ventilation?

Hi,

would you place a rain leakage in this position in case of poor workmanship or just to stress the model? Please see the image attached.
Regards and tanks in advance

so, do you mean that I can use a lime plaster with the name "interior" for exterior lime render?