Plywood v Cement Particle board for soffit

[mel o]

Just wondering if anyone has an informed opinion on this: Our architect specified that the facia/ soffits be made from cement particle board. Our builder has used plywood and says they do the same job and that he's never heard of CPB being used. I just wonder why the architect would have specced CPB if there wasn't a reason? Anyone know about this kind of stuff?
Thanks,
Mel o

 

[galwaytt]

Avoid plywood, your arch is correct. Plywood is at best a medium-term solution. It absorbs water and delaminates, so will eventually need replacing.

CPB or Cement Board -e.g. Tegral Bluclad/Cegral/Operal or Versapanel are infinately better.

You only want to do this job once !

We've just done a whole (small) demo building in the stuff, for our own purposes.

 

[mel o]

That's great, thanks for the advice. I'll get back on to the builder and insist he changes it to CPB.