iNow Posted December 7, 2008 Share Posted December 7, 2008 So, I've been doing a lot of renovating of my house since I bought it, and I'm doing all of the work myself. Yesterday, I spent most of my day in the master bathroom ripping down tiles and existing drywall. The bathroom has two walls that connect to the exterior of the house (it's in a corner, and two of the walls need exterior to interior insulation). I'll be using batt insulation, the cotton candy-looking stuff, which has a vapor barrier made of kraftpaper on one side. The insulation there now is in good shape, but is more than 30 years old. It's a faced insulation (fiberglass with a kraftpaper backing). I plan to add new insulation regardless, but my question is this. As long as I'm careful not to compress the insulation, can I simply add another layer of faced insulation on top of the layer of faced insulation which is there now? I know this will bring greater protection against thermal transfer, and the wall cavity is large enough to receive two layers without compression, but my concern is specific to the faced layer already there. I am not quite sure if creating a sandwich of exterior/fiberglass/kraftpaper/fiberglass/kraftpaper/interior will work or present unforeseen problems. Can you guys think of any reason not leave the existing faced layer in place, and just add another faced layer on top, as long as compression is not an issue? I know it's okay to do when using unfaced insulation, but that vapor barrier in the middle has me apprehensive, since it's a bathroom project... Then again, an additional vapor barrier in the middle may be a good thing. I dunno. Any ideas? Link to comment Share on other sites More sharing options...
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