Recycled insulation in a metal building

[davejo]

I'm putting up a used red iron building. When it was taken down, they saved the insulation but i think the white vinyl lining is pretty beat up as it was affixed originally with two-sided tape. Trying to decide if its worth trying to reuse this stuff with a new facing installed first. Something like this at $ .20/sf:

https://www.americover.com/10_mil_reinforced_fire_retardant_6_1328_prd1.htm

The other option is to use metal sheets (free) on the underside of the girts and just lay the fiberglass on top of it but I'm not sure if I would get rust problems by encapsulating the purlins etc

My main goal is prevention of condensation and rusting of the metal frame. Its a barn and will have open doors almost all the time for ventilation.

new unfaced fiberglass is $ .28/sf
new vinyl faced fiberglass rolls are $ .80/sf,
bubblewrap rolls are $ .55/sf

 

[James-W]

Is spray foam out of the question?

 

[metlmunchr]

If its going to be open all the time then no insulation is best. Let the temperature of the metal swing with the air temperature and don't create any places for moisture to collect and condense.

 

[theoldwizard1]

There are places that sell recycled rigid foam board for a fraction of the cost. You need a truck and trailer and may have to drive a couple hundred miles, but it is cheap.

 

[davejo]

The steel purlins are 5 feet apart, trying to imagine how to fasten rigid boards under the metal roof sheeting. I think the roof tin needs to be pretty well anchored to the purlins to create a good diaphragm so I don't think you can sandwich a thick board between the two layers, can you?

No insulation might work for the condensation part but still would worry about radiant heat in the summertime or roof noise during microbursts etc. Forced ventilation?

I guess if its "unlivable", I could go spray on insulation as a retrofit solution. (not in budget right now)