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What's the difference between Roxul Comfortbatt for wood studs versus the one for metal studs.

Can I use Comfortbatt for metal studs on walls with wood studs? I'm finishing my basement and my local hardware store only have available the metal stud version...

Thanks

  • @DanD, why did you delete your answer? Did you discover that it was wrong? It does look like the steel version is an inch wider for the reason you mentioned. – isherwood May 19 '17 at 16:50
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Steel studs for interior partitions are C shaped and very thin material (see picture below). This means that 16" metal studs on-center actually have room to fit ~16" of material where wood members spaced 16" on-center have space for pretty close to ~14.5" of material in between. Voids between wood framing vs. metal stud framing

Per the dimensions on the Roxul site in your link, the difference between the wood stud and metal stud versions are exactly for that reason. The metal studs versions are an extra inch wider. Comparing products for 16" on-center spacing: 15.25" for wood studs, 16.25" for metal studs.

You could probably make the metal stud version work for wood studs, but you would need to either:

  1. Compress it by one inch to get it to fit. Compressing insulation reduces its effectiveness, so you will no longer get quite the same advertised R-value.

  2. Cut one inch off of one side along the whole vertical length of every batt. If its faced insulation and you opt for the cutting route, make sure to leave the facing intact so you can still use the facing to secure it to the studs. I haven't seen the metal stud version in person, but I would imagine that the insulation extends all the way to the edge of the facing one one side to fill the void on one side of the steel stud, so this would be the side to cut off insulation.

Personally, I would try to get the right material for the type of framing to make installation easier and/or get closer to the advertised R-value.

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I believe the answer is yes. There would be no dimensional difference if the metal studs are installed correctly. Plus, I don't see anything on their website addressing this specific issue so I think it may not be a real issue to worry about.

Take a close look at what the store has, then compare it to what you can find both on their web site and on Google about it. If you decide that what the store has then you can order anything you want online.

It looks like a great product.

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You don't want to use metal for wood application. I worked with both, and you would actually lose the R-value when compressing the material over its normal state!

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