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Old 10-03-2015, 10:27 PM   #1
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Bathroom above garage


Hi all.

My current renovation project is a 2nd floor master bathroom that sits above the garage. I have a few insulation questions.

The joists are 2x10 with varying centers. There are some bays with plumbing, some with drains, and one with ductwork. The original insulation is foil side down (garage side), looks fairly well compressed, and is essentially "under" or on the garage side of any pipes, etc.

1. Is R19 appropriate to use here?

2. Can I place the insulation on "top" (bathroom side) of any drains or water pipes. . .or should I not have anything between them and the bathroom floor?

3. Should the facing be up (bathroom side) or down or doesn't it matter?

Here's an older pic. . .

[ATTACH]201721[/ATTACH

Thank you.
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Bathroom above garage-img_20151003_230434358.jpg  
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Old 10-03-2015, 10:33 PM   #2
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That...is a hot mess. I will let the framers comment on the joist butchering going on there.

I would look at buying a kit of spray foam. I would say that you can use rigid but working around all that plumbing would be a pain in the rear.

Insulate the bottom, as pictured of the joist bays. This will keep the heat from being list to the garage and let the room side heat keep the pipes warm and above freezing. Any insulation you put down between the conditions space and the pipes will make them colder and more possible to freeze.

Something with a low per rate is what you are looking for here in terms of the foam.
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Old 10-03-2015, 10:50 PM   #3
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Ha ha. Well, like I said, that is an old pic.

As far as the "butchering" goes, those joists have been there since 1955. Feel free to elaborate.

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Insulate the bottom, as pictured of the joist bays. This will keep the heat from being list to the garage and let the room side heat keep the pipes warm and above freezing. Any insulation you put down between the conditions space and the pipes will make them colder and more possible to freeze.
Ok, that's what I thought. Thank you.
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Old 10-04-2015, 09:56 AM   #4
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I will let the guys, should they comment, that frame comment on that.

No need for vapor control on the side facing the conditioned space. Moisture and heat move up.

You should use a Closed Cell foam across the bottom (i.e. side facing the garage) as it will give you a better R-Value per inch and control the moisture from the garage side.
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Old 10-04-2015, 11:58 AM   #5
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Well, the only issue is that only a portion of the garage ceiling is open below. That's why I was hoping fiberglass insulation would be ok because working around the piping, etc., from the bathroom side with foam boards would be a pain. I would also need to provide some support to hold the foam up before I close the part of the garage ceiling that is open. Plus, I have two unopened rolls of R-19 laying around. Just a little more work, I guess.
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