Understanding Rainscreen Systems with Dr. John Straube

Join Dr. John Straube as he dives into the anatomy and science behind rainscreen systems, and what a rainscreen system requires above all else to be effective. He also details how DELTA®-DRY’s unique application in these systems solves moisture problems in the most common wall types, especially absorbent claddings like stucco or manufactured stone.
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About Dr. John Straube
John Straube, Ph.D., P.Eng., is a principal at RDH Building Science Inc., where he heads forensic investigations and leads research projects in the areas of low-energy building design, building enclosure performance, hygrothermal analysis, and field monitoring of wall assemblies. He is also a prolific writer and a noted public speaker. In addition to his work with RDH, Dr. Straube is a cross-appointed faculty member in the School of Architecture and the Department of Civil and Environmental Engineering at the University of Waterloo. Dr. Straube’s leadership as a building scientist and an educator
has been recognized with multiple awards, including the Lifetime Achievement Award in Building Science Education from the National Consortium of Housing Research Centers (NCHRC) and the Professional Leadership Award from the Northeast Sustainable Energy Association (NESEA). Get the full scope of Dr. Straube’s work, awards, and contributions to the industry over at RDH.

[@kevinhaskins6619]

I'd be curious how much moisture cement fiber cladding systems hold compared to LP Smartside. My intuition would be that the cement fiber will retain more moisture and be a bigger issue for the inward vapor drive.

[@explosivetwist]

have you graphed the difference between 2 layers of building paper and dimple mat in climate zone 3 hot-day? ie: southern california? thank you.

[@reginaldwhite7944]

Need to stucco over the rain screen is this possible Thanks

[@josephhuether1184]

Just curious…would you consider 3/4” or 1” rough-sawn, unpainted pine vertical “barn” siding to be a “moisture storing cladding?
How about traditional Shou Sugi Ban vertical cypress?
In my climate zone (5) these are usually installed on wood furring over a vapor permeable air and water barrier. Presumably there would still be inward vapor drive.

[@LTDan-pk3mx]

Hi John great information.. I am about to do a job consisting of 2 in board insulation over OSB then wood firing strips on top of the insulation vinyl dutch lap siding on a north wall.. Would you mind giving me direction as to do a proper and long lasting install? Thanks ahead of time!!

[@donzheng7068]

He is behind the technology you just mentioned. You are ahead of him.

[@davidbruce5377]

If you put Delta Dry on the exterior, acting as a zero perm material and applied 6 mil poly on the interior wall, wouldn't, that trap moisture, in your wall cavity?

[@coselladorken]

Hi David. Thanks for asking! While the DELTA®-DRY itself is impermeable to block solar-driven moisture, it is not installed as a continuous vapor barrier as the 6 mil poly would be. There is an air space between the DELTA®-DRY and the water-resistive barrier that both prevents it acting as a vapor barrier and provides critical drying energy by the venting moist air through ventilation gaps at the top and bottom of the wall.

[@davidbruce5377]

@@coselladorken Thank you. Does Dorken Systems have a WRB (peel and stick) membrane, a perm rating of, between 7 to 10?

[@coselladorken]

@@davidbruce5377 “DELTA®-STRATUS SA and DELTA®-VENT SA have perm ratings up to 50 perms for faster diffusion of moisture vapor.” DELTA®-STRATUS SA bit.ly/2U0IlhK DELTA®-VENT SA bit.ly/3hTADxG