Sheet insulation in ceiling of pole building?

[wantacoe]

I am using 2" 4x8 sheet insulation and then 3" Styrofoam on top of that. What can I use to hold it in place until I put the metal ceiling in? Preferably something thin so I can just install the metal over it. Probably weighs about 20 pounds each. thanks

 

[Bert_]

Why foam sheets instead of blown in?

 

[corvette43056]

I just used #8 nails.

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[wantacoe]

Why foam sheets instead of blown in?

It is in a pole building. 45x50 and there is no entrance into the ceiling.

 

[wantacoe]

I just used #8 nails.

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That could work. Thanks

 

[Leaflessshadetree]

You could use ringshank nails with plastic washers. When I bought my house one of my sheds had paper faced fiberglass on the ceiling (which wasn't finished). It was sagging/falling down.
I strung strands of steel wire across it at 3 ft spacing. Held up fine for a few years.