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Detailing bottom of Roxul Comfort board IS

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.


Asked by Edward Krause
Posted Aug 8, 2014 2:43 PM ET


4 Answers

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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.




Answered by Lucy Foxworth
Posted Aug 8, 2014 9:52 PM ET


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.


Roxul ComfortBoard in galvanized channel.jpg
Answered by Martin Holladay, GBA Advisor
Posted Aug 9, 2014 4:24 AM ET


Thanks very much, Lucy and Martin.


Answered by Edward Krause
Posted Aug 9, 2014 9:42 AM ET
Edited Aug 9, 2014 10:17 AM ET.


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.

Answered by Malcolm Taylor
Posted Aug 9, 2014 10:21 AM ET

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