Painting Over Radian Barrier

[stickermigtigger@gmai]

What would be the best way to paint over an existing radiant barrier sheathing wall surface (the shiny side)?

Would a sprayed on latex paint work?

I have a building with radiant barrier (TechShield) installed; shiny face inside. I need to insulate this building. Using foam board or fiberglass aren't good solutions because of the labor involved providing for air flow and moisture prevention (neither foam board or fiberglass can **** right up against the TechShield or moisture will occur and anything touching it will restrict air flow to get rid of the moisture).

Spray foam is the obvious solution but it's expensive and not a DIY project I'm interested in.

If I can paint the shiny surface I can just use fiberglass insulation which is less expensive and DIY friendly.

So, the question is:
What would be the best way to paint over an existing radiant barrier sheathing wall surface (the shiny side)?

 

[stickermigtigger@gmai]

Yes, I know painting the shiny will defeat the purpose of radiant barrier.

 

[mike93lx]

I can't imagine anything is going to stick well to it.

 

[racecougar]

Agreed that you're going to have trouble with adhesion, particularly in the long term.

How is painting it going to alleviate the vapor barrier location (moisture) issue?

 

[stickermigtigger@gmai]

<<<<How is painting it going to alleviate the vapor barrier location (moisture) issue?>>>>

There won't be any moisture if there is no airspace. Directly applied paint will eliminate the airspace/moisture problem.

 

[racecougar]

It will still act as a vapor barrier. I don't believe it will provide any positive benefit here.

 

[stickermigtigger@gmai]

If you are correct then spraying foam over the shiny will have the same (negative) result. Which do I believe; that there is no way around the moisture problem or there is, because some builders are using spray foam as a solution? Seems to me if spray foam against the shiny prevents moisture then surely a paint that sticks to the shiny will provide the same result.

 

[mike93lx]

Why are you committed to this approach? Just install baffles or leave the insulation off the sheathing. I am failing to see what a coat of pain will solve

 

[finn]

Why are you committed to this approach? Just install baffles or leave the insulation off the sheathing. I am failing to see what a coat of pain will solve

Aesthetics???

 

[stickermigtigger@gmai]

Thanks for all the comments folks. Was hoping someone knew. I've contacted TechShield for their take on it. If I hear back from them I'll post their response. I'm out for now.

 

[mike93lx]

Aesthetics???

I'm lost... It's getting painted them covered with insulation, if I am reading this right

 

[MovingAlong]

Yes, I know painting the shiny will defeat the purpose of radiant barrier.

As the barrier blocks radiation, hard to see how painting it would defeat that. It's aluminum foil.

Techshield appears to be perforated to allow for some vapor movement. Painting may defeat that.

But when trying to get coatings to stick to things that don't want to be coated - shellac as a primer may be your solution. No idea on what your insulation plans will do or how this would change anything. Just talking about primers...

 

[racecougar]

If you are correct then spraying foam over the shiny will have the same (negative) result. Which do I believe; that there is no way around the moisture problem or there is, because some builders are using spray foam as a solution? Seems to me if spray foam against the shiny prevents moisture then surely a paint that sticks to the shiny will provide the same result.

Closed cell spray foam is a vapor barrier itself. If you could make it stick to your existing radiant barrier, it would be okay. Painting the radiant barrier before placing fiberglass up against it won't correct the vapor barrier issue here.

Does this building have a ceiling? Vented soffits and ridge?

 

[txvwnut]

If the radiant barrier sweats then the paint will that gets put on it will most likely sweat. Is there not a way to install a vapor barrier over the radiant barrier then the insulation.