Flash and Batt GARAGE insulation // Rockwool Comfortbatt R15 // Garage Build Ep. 14

Looking for the best garage insulation method without breaking the bank? The flash and batt garage insulation technique is the best air sealing and R value for the money. Rockwool Comfortbatt offers additional benefits that fiberglass insulation can not match. Thank you to Rockwool for sponsoring this video!
Sponsored Products:
🔥Rockwool comfortbatt R15: www.rockwool.com/north-americ...
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Detached Garage - Garage Build Sponsors:
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PolyGuard: www.polyguard.com/
Clopay: www.clopaydoor.com/
Huber Engineered Woods: www.huberwood.com/
Interested in sponsoring the build? email me: [e-mail]
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I WANT TO HEAR FROM YOU! --- Let me know in the comments, what topics you would like to see videos on.
I started this channel with the goal of helping people Plan, Design, Build, and upgrade their garage. I'll take you through the process of building my own garage as well as other garage tours and some product reviews. I've scowered the internet and RUclips for hours on end looking for one single source of information to help me plan, design, and build my dream garage. I was never able to find a single source for that information, so I started this channel to be that one location. I hope to help you with your garage build and after following along with my build process, help give you the confidence to self general contract your build. If that sounds interesting to you, please consider subscribing!
Many people are intimidated by trying to build their own garage. I hope this channel will help take the fear out of designing and building your garage. Garage builds are an expensive dream with many critical building decision points along the way. I hope to help guide you through the decision points of building the perfect attached or detached garage for you!
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[@bobbray9666]

People need to know how much closed cell foam to use for proper thickness before adding batts based on the local heating zone. If too thin, bad things happen with moisture. You don't want to use a vapor barrier on the heating side of a wall with closed cell foam and if the foam is too thin, condensation will happen and the batts will get wet and mold will follow. A smart vapor barrier can be used when flashing foam and adding batts but no interior plastic sheeting as a vapor barrier or the walls will have nowhere to dry with foam behind the sheathing. There is a good video of a new home in Iowa (I think) that had spots where the foam was only 1/2" thick and they needed to remove all drywall from all exterior walls and start over because of mold due to their batts becoming ringing wet during their first winter. They were devastated.
A consistent 2" thickness of closed cell foam (R-12) is probably safe for most US states before batts but minimal for zone 6 and higher. I'd stay away from flash and batt because the money you think you'd save might cost you an arm and a leg if something wasn't done right. At least for your living areas. A garage periodically heated, maybe not so much.

[@DetachedGarage]

Great insight! You are absolutely correct that the entire system needs to be done correctly to eliminate moisture issues. Your comments about the vapor barrier are spot on as well.
I live in southeast Wisconsin and went with 2" minimum closed cell on the wall as well as the Zip-R3 for additional R value and thermal break. I shouldn't have any issues with moisture in the summer or winter.
I certainly appreciate your insight and I hope you enjoy the rest of the build series.

[@bobbray9666]

@@DetachedGarage Cool. We built last year in the Twin Cities area and used Zip R-12 over 2x4 wall studs filled with closed cell foam for R-30 walls. The great thing about Zip-R is you don't need to build window bucks, a WRB over regular sheathing, then furring strips over mineral wool or XPS exterior insulation and and then worry that all details were followed for an air/vapor proof envelope. Our blower door test was 75% better than passing. I applied the Zip tape and liquid flash myself because I didn't trust our framers who had never used Zip sheathing after they balked at using foam polyurethane adhesive for the subfloor. That stuff is strong. They also balked at the strict nailing pattern with 4" sheathing nails and I had to buy a big nail gun for them to use and teach them to adjust the air pressure as not over drive the nails. Our home is a one story, so 2x4 walls was no worry for shear. The closed cell foam between studs adds stiffness to wall assemblies as well.
By building with 2x4 walls, regular window jambs for 2x6 construction worked perfectly. I also had them use 4" structural screws for our window flanges, thinking air driven nails could blow through. I used Zip stretch tape for the window rough openings and ripped pieces of siding to get a pitch on the window sills under the stretch tape. Our siding was LP Smart, which has raw OSB on the back, so I spec'd a 1/4" plastic mesh rainscreen, stapled to the Zip.
Good luck with your channel. Most building and woodworking channels I see exist to promote their sponsors and they seem to talk out both sides of their mouths depending on which sponsor they're promoting that day. One of the biggest (Matt) was heavily promoting Zip but has moved on to several other products who probably pay him better...😃💰

[@DetachedGarage]

@@bobbray9666 sounds like an awesome build! I certainly have a few sponsors, but I only reach out to sponsors that I actually WANT to use their products.
Build it right 👍 Let me know if you have any additional tips along the way and thank you for your support of the channel 🙏

[@raffibeu9942]

How did you get such big sponsors with so short videos showing nothing and with such less views? The project is very interesting but you don’t show nothing 😢

[@DetachedGarage]

What additional details would you like to see that are missing?

[@MyDIYAdventures]

Gotta muffle that swearing and wrench throwing!

[@DetachedGarage]

Ain't that the truth! 😂 I've done two walls and it is already so much quieter!