Once again... I'd suggest you research the material before you make
comments. You may believe it, but the data doesn't support your beliefs.

Ed

Terry Spragg wrote:

Some foam is good as structure, some is so scored for flexing
purposes, that it is not, IMHO. I believe that c-flex (AKA
"fiberglass planking" among some) is intended to be torn out
after serving as shape form. It is not intended to be used a
structural ingredient.

The real point, fiberglass panels are built in situ, not
purchased as structural material, seems to be adrift amongst the
angst.

C-flex is a temporary form material, only.