how think firecheck for 90/90/90 rating

how thick firecheck for 90/90/90 rating

i have had conflicting reports on how thick i need to do firecheck for a 90/90/90 firerating
is it 2x 16mm sheets or 3x 13mm sheets?

also what sizes can the sheets come in?
 
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We had to put 2 X 16mm for 60x60x60.

Comes only in 13 or 16 I think.

Why do you need 90? Seems like overkill.

Especially as you need to put it on both sides.

Bloomin stuff weighs a ton too.
 
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