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I am thinking about installing niche on outside wall. One of my concerns I have is that if siding needs to be changed, during installation of the new one, nails can go through the plywood and penetrate the niche. Is this a legitimate concern, or are nails will not go that deep?

Update: The wall is made from 2x4's and I am located in NJ. I am thinking about using Reflectix insulation in the cavity of 2x4's where niche will go.

Update 2: Is it a good idea to add another set of 2x4's to existing wall to make niche stand out 4" from the wall? Not grow the whole wall, but only part where niche will go. Here is the drawing of what I mean.

niche

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  • More information is needed. Feb 3 at 4:09
  • Is the wall a 2X4 wall or 2X6? What are your winters like?
    – Jack
    Feb 3 at 4:24
  • I updated OP with needed information
    – positron
    Feb 3 at 10:07
  • "Is it a good idea to add another set of 2x4's to existing wall to make niche stand out 4" from the wall?" a bump out on the outside? Sure, if that's what you want, but it will be a royal pain to handle your exterior finishes - sheathing, house wrap, siding, trim, paint, etc. Hope I misunderstood you!
    – FreeMan
    Feb 3 at 12:05
  • @FreeMan, I meant on the inside, but then I measured and and with bathroom being 48"x48", I am afraid I it will in the way of movement around the shower. Having said that, should I be concerned with nails going through the plywood hitting the niche?
    – positron
    Feb 3 at 12:59

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Based on the clarity from your drawing, I would definitely add the framing to the inside for your niche.

If you don't, you'll end up with a basically uninsulated hole in your shower. If you're in a cold climate (and Jersey can get chilly, especially this week), that will make your bathroom frigid, especially when you're taking a shower.

Siding nails could be a concern as well at some random point in the distant future, but the primary issue is the lack of insulation which you'll feel every cold day in the fall/winter/spring.

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  • Is mold growth concern with little insulation? And I am talking about about 2" compressed insulation behind the niche.
    – positron
    Feb 3 at 15:13
  • Sounds like fodder for a whole new question, @positron. Question scope creep is not looked kindly upon 'round here. :) Also, questions & answers in comments aren't searchable.
    – FreeMan
    Feb 3 at 15:14
  • noted thanks. In my defense I did say "One of my concerns" :)
    – positron
    Feb 3 at 15:28

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