HELP insulation question for my bathroom walls

Ruddydog52January 18, 2012

I am remodeling my bathroom it is a very old drafty house the contractor has recommended to use fiberglass insulation with 6 mil thick plastic over that and double sheet rock the out side wall.

My question; Is it okay to use plastic over the walls and ceiling? I always heard the house has to breath. The contractor tells me the exhaust fan will take care of the moisture. Help we are getting close to insulation time!

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Most of Zone 6 is far heavier on heating than cooling.
The plastic goes near the warmer side of the wall to limit moisture movement in to the insulation.

    Bookmark   January 18, 2012 at 10:11AM
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Don't use regular sheetrock in a bathroom.
At the very least, use 'Blueboard'.

    Bookmark   January 18, 2012 at 10:17AM
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"Don't use regular sheetrock in a bathroom.
At the very least, use 'Blueboard'. "

Regular sheet rock is just fine outside of wet areas (around tubs and showers).

Cement board is still the preferred base for tile, though there are newer membranes that claim enough waterproofing to allow tile on membrane on drywall.

A coat of primer and latex paint is enough protection for drywall in areas not considered 'wet' (tubs and showers).

    Bookmark   January 19, 2012 at 10:45AM
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ALL areas of a bathroom can be considered 'wet areas'
if you got yunguns.
Blueboard everywhere is cheap insurance.

    Bookmark   January 19, 2012 at 2:30PM
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"Blueboard" is very thin veneer plaster on gypsum wallboard that has an absorbent facing but no treatment for moisture resistance other than a harder more durable finish over the entire wall. Blueboard is not available in many areas of the US but where it is available it should be the standard choice in all rooms of the house.

The concept of a house needing to "breathe" is often misinterpreted. It means a that any moisture in an exterior wall should be able to move to the dryer outside air in a cold climate and to the dryer inside air in a hot climate. The air quality of the interior spaces should be addressed with exhaust fans and heat recovery air exchangers and/or by opening a window not by moisture or air moving through the exterior wall.

In a cold climate, moisture inside the house needs to be prevented from passing into a conventionally insulated exterior wall by a vapor barrier in order to prevent it from condensing and freezing on the inside face of the cold exterior sheathing.

I can't imagine why two layers of drywall would be recommended unless it was to reduce the penetration of noise from outside through an exterior wall that contained no windows.

    Bookmark   January 20, 2012 at 9:32AM
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"ALL areas of a bathroom can be considered 'wet areas'"

But they are not, and splashed water from children in the tub is not nearly the same as water from a shower.

The tub enclosure itself is a wet area, but not the walls around the sink or toilet.

    Bookmark   January 20, 2012 at 2:11PM
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Brickeyee, even though you know everything about everything,
you apparently never raised any children. When my kids
were young, they could get water on the house across the
street, when they were in the tub. And others have told
me that their kids were even worse than mine.

    Bookmark   January 21, 2012 at 12:23PM
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If your kids splash enough water to saturate the surrounding wall surfaces the finish on those finishes need to be tile instead of paint or an adhered wallcovering and in that case the nature of the drywall behind it wouldn't matter. Unless your kids use a hose to soak the wall several times a day the wallboard will not be affected. The ceiling in the room below would fail before the wall would.

As I said earlier, "blueboard" should always be used in all rooms if it is available in the local market but it doesn't have any special resistance to repeated contact with water; it's made of the same material as regular drywall.

Perhaps you meant to say "greenboard" (moisture-resistant drywall) but it offers so little protection I would skip it and pay more attention to water resistant finishes.

    Bookmark   January 21, 2012 at 4:06PM
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"apparently never raised any children"
Yes I have.

I sounds like you have a control problem though.

Try some parental supervision.

It seems seriously lacking in may parents today.

    Bookmark   January 22, 2012 at 12:32PM
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I"m sorry Mr. Brickeye, there was never a control problem
in this house, once the 'old man' got home.
I suggest you go back to telling everyone else how wrong
they are about everything, as it's not going to work with

    Bookmark   January 22, 2012 at 3:17PM
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Drywall use limitations from USG catalog

USG brand SHEETROCK (regular gypsum board):
"Exposure to excessive or continuous moisture ... should be avoided."

USG Veneer Plaster Systems ("BLUEBOARD"):
"Not recommended for use in areas exposed to moisture for extended periods ..."

    Bookmark   January 22, 2012 at 7:11PM
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