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Discussion Starter #1
I have been using unfaced Johns Manville JM814 for my room treatments up to this point. However, I am now considering treatments for the rear of my room and my understanding is that it is best to use some sort of bonded membrane on the panels facing the room. All I have seen discussed is FSK faced panels but it looks like the JM814 is available with FSK or AP facing. Here are the descriptions.

FSK Reinforced Foil and Paper (Foil-
Scrim-Kraft). Aluminum foil reinforced
with fiber glass yarn and laminated with
fire-resistant adhesive to kraft paper.

AP (All-Purpose). The AP facing is white
kraft bonded to aluminum foil, reinforced
with fiber glass yarn. The kraft paper is
laminated with a fire-resistant adhesive
that minimizes the possible corrosion of
the foil.

It appears that the only difference is that the AP facing is white instead of aluminum which would be less likely to show through the fabric. Does anyone have any experience using the AP facing or know if it would perform differently from the FSK. Probably a longshot but thought I would ask anyway.
 

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What you're describing as AP is actually normally referred to as ASJ (all service jacket).

Both work very similary but ASJ will require a more serious adhesive to work rather than FSK.

Bryan
 

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Premium Member
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177 Posts
Discussion Starter #3
What you're describing as AP is actually normally referred to as ASJ (all service jacket).

Both work very similary but ASJ will require a more serious adhesive to work rather than FSK.

Bryan
Bryan,

I'm not sure why I would be concerned about adhesive. As long as they perform similarly acoustically, I think the white AP/ASJ facing would blend in better behind the light colored muslin covering I'm using.
Thanks
 

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177 Posts
Discussion Starter #5
Thanks for the explanation...I built all of my panels with some sort of frame but I guess that's another way to do it.
 

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Bryan,

I'm not sure why I would be concerned about adhesive. As long as they perform similarly acoustically, I think the white AP/ASJ facing would blend in better behind the light colored muslin covering I'm using.
Thanks
Sorry. I agree. Either is fine. The AP is just a different finish that doesn't necessarily take adhesives the same way.

Bryan
 
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