Preventing Ridge Rot In Conditioned Attics (Featuring Dr Joe Lstiburek)

Check out Joe's articles mentioned in the video:

Building Science's Newsletter:

Delta Foxx Underlayment:

Ultra Aire Dehumidifier:

And another great article on using Mineral Wool or Fiberglass in a Conditioned Attic.

Be sure to checkout our new Podcast!

Huge thanks to our Show sponsors Polywall, Huber, Dorken Delta, Prosoco, Rockwool & Viewrail for helping to make these videos possible! These are all trusted companies that Matt has worked with for years and trusts their products in the homes he builds. We would highly encourage you to check out their websites for more info.

[Bob_Lob_Law]

So basically, if your attic is conditioned, you need to actually condition it.

[gordonbeaulieu]

Always a great sign when Matt Risinger starts off with "we're going to get a little nerdy today"

[coastiesaurus]

I had the pleasure of meeting Joe back in 2004 at a conference and had lunch with him and just by chance I had my blue prints in my car, getting ready to build, and he was kind enough to look them over. I built an ICF home, metal roof with spray foam in the attic. 2000 square feet and only need a 2-ton unit, love it. Great guy.

[aldoogie]

What an honor to do an interview with Joe Lstiburek, he's my hero - having coffee with him would be like winning the lottery. Also, let's be honest, we were definitely expecting a lot more beard.

[SailorBrian]

You don't have to say we are getting nerdy. They are all a little nerdy, and PERFECT. Keep it up guys.

[mcintosh.daughter]

I LOVE YOU JOE no matter what they say. Love you too Matt. This one was awesome. Good laughs. Great science. Great education. Thanks

[rummy]

As a sheet metal tech and duct installer in south Louisiana I can testify to the sweating duct with open soffit and gable vents. I've been making customers close those off for over ten years. If it's 100% humidity outside, it's 100% humidity in your attic. Attics used to be super hot during the day and it would take all night for it to cool down to dew point. They want to prolong the life of shingled roofs and keeping them cool does do that but it also makes a terrible environment for duct work if humidity is present.

As soon as I heard him start talking about us I googled "roof ridge diffusion vent" and his article was one of the first things that popped up lol.

[toddcooper]

Incredible interview, Joe would get my vote for a Nobel prize. I’m currently renovating an old farm house built in 1950. I’ve spray foamed my underside roof with 2” of closed cell foam. I chose this method for another reason than to prevent the ping pong, that is too long to explain in this comment. But I’ve been worried about rotten roof sheathing since I had the foam sprayed in. Matt thanks for this valuable show you’re producing. Sure appreciate your devotion to doing it right.

[marcob]

I would enjoy seeing a discussion, or maybe a series, highlighting and explaining some of the key differences in building from region to region

[carrabellicusp]

There is nothing like Joe it’s a talent to make science interesting and fun

[Itchabo]

Big thanks to Joe for pioneering building science. Great stuff!

[slkgeothermal]

I am a geothermal HVAC contractor and I do open cell spray foam encapsulation with open attic return air (no return air duct, drawing return directly from the attic). I use an ERV for fresh air makeup. I have had zero humidity issues.

[roberttaylor]

I'd really like to see a cross section of your roof because it's getting a little unruly to keep up with. Perhaps you could provide an axon-metric diagram?

[bigjack]

I just finished listening to dr Joseph. Great talk on vented vs non-vented.

[josephbidwell]

Finally answered my questions about insulated attics. Thanks so much

[ArthurDentZaphodBeeb]

We need more Joe!

Great interview Matt. Going to use that vapor diffusion port idea...

[AerobaticsPilot]

LOVE his presentations. The Dr is in. This guy wish people could talk to him for every build we would never have issues. But people being cheap is why Manu time thing go wrong

[CKPill]

It was my biggest concern about our new home design, thanks for posting

[frankhartley]

Perfect timing again. I just bought a house and I'm already took all the spray in insulation out. And was thinking let's do spray foam afterwards. Now this ease my mind on it. Great content as always Matt.

[theamericansgarage]

Very thankful for you Matt. Truly thankful. Building a track build home through a common luxury builder right now and you have given me an arsenal of information to stop poor building standards dead in their tracks. I almost would rather flip this home in Houston and get a custom build from you or one of your associates. I hope you find a way to spread your knowledge through the world of new build realtors, inspectors, and contractors. I have been surprised how many haven’t heard of you in Houston and I feel I can’t trust those who haven’t. I would almost say you should create your own standard because if you were to approve a material or builder or contractor people like me could hand over a blind trust throughout the build process and feel much better about our critical choices surrounding our biggest financial investments.