Insulation & Ceiling Recommendations for Post Frame using Steel Trusses

[1974FJ]

I bought a farm that had a 90s era post frame barn with steel trusses. the trusses/purlins/roof metal is all in great shape.
Barn is 40'x80' with 12' posts.
i am going to be putting up new columns/girts/building wrap and siding in the coming months.

i want to insulate the ceiling and wondered the following:
1) insulate the ceiling (spray foam?). how do i know if the truss design can support this weight?
2) clad the interior side of the ceiling with white metal panels. can i run a new group of purlins on the bottom of the trusses and clad with metal panels? again, can the truss system support this?

here are some photos i have of the structure, please ignore the condition of the floor and columns. the columns are being replace and concrete is being poured.

 

[jack stand]

Nice space/building.
I doubt that foam, sprayed or sheets would be a load concern, but I couldn't answer for sure. Anything on them to identify the trusses or manufacturer?
That looks like 12' or so in between them. Are you in snow county?

 

[K'ledgeBldr]

I wouldn’t take anything to chance or guess. Hire a PE to look at it with your ideas in mind.
S/he can give you a yea or nay, or suggest other structure means to accomplish your goal.

Guess that used to be a hay barn?

 

[1974FJ]

Anything on them to identify the trusses or manufacturer?
That looks like 12' or so in between them. Are you in snow county?

No idea. Not sure where to look really.
12’ OC posts
I’m in North Carolina. We get snow once a year at best

Guess that used to be a hay barn?

It was also used for horses.

 

[gregs]

I used the same type of trusses when I built my shop. I attached foam insulation panels to the bottom of the purlins. I used the type that has foil radiant barrier on one side. I put that side towards the roof panels.

 

[1974FJ]

I used the same type of trusses when I built my shop. I attached foam insulation panels to the bottom of the purlins. I used the type that has foil radiant barrier on one side. I put that side towards the roof panels.

You have any photos?

 

[gregs]

Maybe. Its been 10+ years ago. If I remember correctly it was R-Panel 4x8 sheets. I found some round plastic retainers designed for doing this. I can do some looking but it might take a couple of days.

 

[aknott400]

Maybe. Its been 10+ years ago. If I remember correctly it was R-Panel 4x8 sheets. I found some round plastic retainers designed for doing this. I can do some looking but it might take a couple of days.

Hey Gregs, I'm interested in doing a similar thing. Did you ever find a picture of how you did it?

Thanks!

 

[gregs]

Hey Gregs, I'm interested in doing a similar thing. Did you ever find a picture of how you did it?

Thanks!

Unfortunately I didnt find any. Typical working to get the job done and I guess I didnt take the time to document it. I used something similar to these to attach it using deck screws. I had painted the sheets white first to cover up all the printed wording and used white vinyl tape on the seams.

https://www.amazon.com/Plastic-Spreading-Polypropylene-Supporting-Insulation/dp/B0B6V19H3T/?tag=atomicindus08-20