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Insulation - Faced or Faceless?

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I learned a lot about basic insulation principles that I did not realize before. I always thought when it comes to insulation you just stuff it in where you want to stay warm. If you use paper faced even better...In the pics below you can see a mix of paper (faced) and faceless insulation. The exterior walls got paper and the interior got faceless. You don't even need to insulate the interior walls (unless for sound purposes), but I did anyways since you only get 1 shot. The ceilings also got paper faced insulation but didn't need it really. You only need paper faced insulation on exterior facing walls to protect from moisture getting on the cold side. Attics MUST be paper faced for this reason with the paper always facing the warm zone (interior).

These pictures are the eventual shower so I had to add blocking (stylish lateral pieces of wood) to the walls . This is for the cement board to attach to. Only losers put greenboard in a shower. I tried to give my cement boards a screw every 8 inches or so. I went on some forums where crazy people said to actually slit the paper faced insulation when placed on an exterior facing wall where a shower is located, thus eliminating the vapor barrier in this area. This is because of the thought that this vapor barrier now will trap moisture between itself and the eventual moisture barrier on the shower wall. (If you dont care to read this then please skip ahead it is pretty disturbing how much research I did on this topic.) The thing is that the shower moisture barrier, whether you go with a topical barrier like RedGard or plastic attached directly to the studs, is different than the vapor barrier on insulation. The paper faced insulation is NOT a true moisture barrier, its just a vapor barrier. So it really does not have the power to trap in moisture effectively and create a true moisture sandwich. Feel free to research more tho, I could be wrong. After all I am just a chump.

                                

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