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 > What type of insulation?

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colliehauler

Mc Pherson KS USA

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Posted: 06/23/19 05:23pm Link  |  Quote  |  Print  |  Notify Moderator

I'm putting a new roof on a RV project (wood and rubber). I need to put in insulation as well. It had 2 inch unfaced white spun insulation. The only thing the lumber yard has is 3.5 inch faced insulation. I think I have enough room for it but wonder if the faced insulation will be a issue.

What would you recomend?

Lwiddis

Hearst San Simeon State Park

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Posted: 06/23/19 06:43pm Link  |  Quote  |  Print  |  Notify Moderator

What does the manufacturer of the faced insulation say about uses of its product?


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pianotuna

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Posted: 06/23/19 07:16pm Link  |  Quote  |  Print  |  Notify Moderator

Think about how a vapor barrier is installed in a house.


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colliehauler

Mc Pherson KS USA

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Posted: 06/23/19 07:28pm Link  |  Quote  |  Print  |  Notify Moderator

pianotuna wrote:

Think about how a vapor barrier is installed in a house.
That was the point of me asking. They use unfaced and I wondered about using faced and humidity build up in a closed roof, no attic to vent.

free radical

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Posted: 06/23/19 08:25pm Link  |  Quote  |  Print  |  Notify Moderator

If the roof was totaly sealed from inside,wouldnt that stop any humidity aka air
Moisture geting in?
I have plywood roof and glued on rigid foam everywhere from inside so no moisture can ever get onto the plywood.
This rigid foam is completely waterproof as its used for insulating basement walls on the outside,but also floats for house boats.

StirCrazy

Kamloops, BC, Canada

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Posted: 06/23/19 10:08pm Link  |  Quote  |  Print  |  Notify Moderator

2" foam would give you a much better R value than the stuff that was in there.

Steve


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colliehauler

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Posted: 06/23/19 10:42pm Link  |  Quote  |  Print  |  Notify Moderator

StirCrazy wrote:

2" foam would give you a much better R value than the stuff that was in there.

Steve
The problem is the roof is 6 inches in the middle to zero inches at the sides. I like the idea of foam especially since moisture should not effect it. Will probably use foam and maybe some regular insulation on the side of the roof.

pianotuna

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Posted: 06/24/19 12:56am Link  |  Quote  |  Print  |  Notify Moderator

I would use closed cell foam..

gbopp

The Keystone State

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Posted: 06/24/19 05:43am Link  |  Quote  |  Print  |  Notify Moderator

Another option is to use a Wide Application Tip.

You can use Great Stuff, or other, canned closed cell foam to cover the ceiling.

CFerguson

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Posted: 06/24/19 05:49am Link  |  Quote  |  Print  |  Notify Moderator

Maybe get a pro to install expanding spray foam. Advantage of completely waterproof if you do it right.

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