1% Rain Leak vs 5% Rain Leak

Everything concerning hygrothermal Sources & Sinks within the assembly
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Mark Jimmy
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Joined: Wed Dec 14, 2016 10:47 am -1100

1% Rain Leak vs 5% Rain Leak

Post by Mark Jimmy » Fri Feb 10, 2017 3:14 am -1100

I have a question about some simulations I am completing in WUFI-Pro. I have simulated the a wall in St. John's, Nfld. under ASHRAE Year 1 weather file.
I have placed a rain leak in the outer layer of OSB sheathing (I have created five slices of OSB , 1.3 mm, 1.3mm, 1.3mm, 3.6mm, 3.6mm) behind the WRB. I have selected 1% of driving rain as a source and also 5% of driving rain. When I export the moisture source and look at the amount of water entering the assembly it appears that for three instances during the year, the 1% driving rain fraction is giving me almost half or almost the same amount of moisture as the 5% leak. See image below for moisture source and RH of sheathing.

Image - opening image in new tab appears to work for me.

I also would like to confirm the units for the exported moisture source ?

Thank you for your consistent support.

Manfred Kehrer
WUFI International Support Team
WUFI International Support Team
Posts: 351
Joined: Thu Mar 10, 2005 2:17 am -1100
Location: Northbrook, IL; USA

Re: 1% Rain Leak vs 5% Rain Leak

Post by Manfred Kehrer » Fri Feb 10, 2017 3:34 am -1100

There may be a cut-off of the moisture source in cases where the OSB reached max. water content already. This is reported in the summary which pops ups after the calculation.
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