A Cup of Joe: The Truth Behind Open-joint Cladding | Building Science Deconstructed
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- Опубліковано 1 жов 2024
- Building Science Deconstructed is a weekly discussion series by Dörken Systems Inc. featuring some of the industry's most sought-after building science experts. In this episode of A Cup of Joe, Joe Lstiburek dives into the truth behind open-joint cladding systems.
About Lstiburek:
Dr. Joe Lstiburek is the founding principal of Building Science Corporation, one of the most influential, innovative, and respected building science firms in North America. Dr. Lstiburek’s work ranges widely, from providing expert witness testimony to overseeing research and development projects, to writing for the ASHRAE Journal. His commitment to advancing the building industry has had a lasting impact on building codes and practices throughout the world, particularly in the areas of air barriers, vapor barriers, and vented and unvented roof assemblies. His commitment to education earned him the hailing, "the dean of North American building science" by the Wall Street Journal.
Dr. Lstiburek holds a Bachelor of Applied Science in Mechanical Engineering, a Master of Engineering in Civil Engineering, and a Doctor of Philosophy (Ph.D.) in Building Science. Get the full scope of Dr. Lstiburek’s work, accolades, and contributions to the industry over at Building Science Corporation. www.buildingsc...
A cup of joe with Joe...🤔 Sounds like a Saturday night live skit😄. Great video! Thanks 👍
Thanks Joe!! I enjoyed the video. Great information!
Darn, I thought open joints was cladding a water bong wall, lol ! Thank you for this segment, good coffee, have a Merry Christmas!
This is not what I expected to hear . On UA-cam there is lots of videos promote to make open joint not behind cladding itself but behind EPS insulation which is total nonsense in my opinion
How about a cup of blue, or gold, or 50? Joe you know what I mean!
Hello Joe, i know you have been to Juneau, Alaska and know how wet it can be. I live in Ketchikan three hundred miles south of there in a temperate coastal rain forest where we get rain, as in a bit over 200 inches last year. So the ratio between drying and wetting the outer wall treatment is a bit different from what you are saying in that you can get away with gap siding because it has a chance to dry any intrusive rain, snow, etc.(be it gravity fed or boosted by our winds up to and over 100 mph two or three times each year and 180 days per year with winds in the 25-30 mph range) that enters these gaps. My question is; can net drying occur in a wet climate such as ours? My personal experience tells me that it won't happen. That stated it supports my preference for a rain clad system that is a penetration proof as possible. After more than seventy years here and seeing building performances I have come to the conclusion that steel sheeting is probably the best you can do for protection of the structure over a good exterior insulation and membrane with rain clad the goal and an air vent at the bottom for air and drainage behind the steel. Designing for moderate climates leaves us here with product failure in our buildings at an early stage. Am I missing something here? Is there a better way?
Also I wouldn't want to depend on modern membranes to last fifty or sixty years which is easily achieved by steel siding and some steel roofing. The membranes just don't have a history of that kind of open exposure for any meaningful number of years. While I feel comfortable using them that only holds if they are completely covered with an interlocking weather resistant siding.
I am interested to hear you view this type of cladding through the prism of extreme weather performance as opposed to mild stressing in a moderate climate.
I just completed a shop addition to my existing shop where i used a wall system of 3/8 plywood inner finish, fiberglass insulation in the 2x6 wall studding, 1/2 inch plywood sheathing, a layer of premium (corrugated) Tyvek, two inch rigid foam board, one inch rigid foam board with aluminum facing, 3/4" horizontal furring strips, another layer of premium Tyvek, and finally exposed fastener corrugated steel with no mid joints. I am interestedly watching its performance.as time goes on. I heat the 18000 cu. ft. with a ton and a half mini split. Keeps the shop at sixty six degrees from 0 F to 95 F as well as controlling the humidity (and rusting of my tools!) while running at a minimum setting the entire year. The wall system is open at the bottom but closed at the top to prevent driving rain from entering. Four foot gable overhangs and 18" on the sidewalls (set backs wouldn't allow four foot), shed style roof, standing seam steel over Grace, 5/8" CDX sheathing, 2 1/2" x 12" box beam rafters 16" o.c., R48 fiberglass insulation, 3/8" CDX as the finished ceiling. A 1" air gap vents from soffit to peak. The theory being the roof deck can vent through the plywood to the inside since the Grace Ice and Water as well as the steel will not allow it to vent to the outside. I have doubts in my mind but think it has a good chance of doing so and will keep an eye on it.
Hope you had a merry Xmas and will have a happy new year. You do good work in the building field and it is much appreciated.
Douglas Thompson
Uh… probably email him I don’t think he’s gonna see this.
Thanks for being open to joints!
Joe, what would you consider to be a good 50 year protection layer?
We recommend a product specifically designed to be exposed to UV light and remain stable. For Dorken, that is DELTA®-FASSADE S.
Any concern with insects getting behind open joint cladding?
It would be possible for insects to get behind the cladding. However, the insulation and the rest of the substructure would be protected by DELTA®-FASSADE S WRB, so any creepy crawlers can’t get too far.