Detailing bottom of Roxul Comfort board IS

edkrause | Posted in Green Building Techniques on August 8, 2014 03:43am

How are those of you using this product detailing the bottom of the wall where the Roxul is exposed?

I noticed on one post about a project in BC, they used a perforated galvanized channel to encase the bottom of the IS. Does anyone know where to source a channel like that?

I’ll be using 3″ Comfort board over 1/2 CDX sheathing, over 3/4″ x 3″ furring strips, then cedar shingles.

Thanks!

Answer

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Replies

LucyF | Aug 08, 2014 10:52pm | #1
Edward,

Here are 2 links to installing Roxul mineral wool on the exterior. These photos show the J-channel at the bottom of the Roxul. The only company I've found that has a similar product is Menzies Metal. I wasn't able to find that product when we were building our house, so we just skipped it.

https://www.greenbuildingadvisor.com/blogs/dept/guest-blogs/installing-roxul-mineral-wool-exterior-walls

http://agreenhearth.com/stone-wool-to-warm-the-heart-and-the-home/

http://www.menzies-metal.com/vent-flashings/perforated-j-channel-rain-screen-low-back
GBA Editor

Martin Holladay | Aug 09, 2014 05:24am | #2
Edward,
Show this photo to a local sheet metal shop and ask if they can bend you some perforated galvanized channel that looks like the photo.

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edkrause | Aug 09, 2014 11:17am | #3
Thanks very much, Lucy and Martin.

-Ed
Expert Member

MALCOLM TAYLOR | Aug 09, 2014 11:21am | #4
Edward,
It is a lot easier here in BC. Because our code mandates rain screens, most lumberyards stock a variety of widths and as Martin said will also bend up any other custom sizes. Soffit installers also have breaks and might be another place to try.