Celotex fiberboard sheathing

[mnc]

I own a 90's Liberty 14x72 that has Celotex fiberboard as sheathing underneath the vinyl siding. I know from looking at the material myself, that it doesn't seem to hold up well under damp conditions. My question is this: If I replace the vinyl siding and remove the fiberboard, what thickness of plywood or OSB should I put up in it's place before installing new siding? I certainly don't want to put too much weight around the outside of the home. Any ideas? Thanks.

[Groo]

my pile had its aluminum sheeting pulled off, and replaced with vynil siding, with nothing undernieth. That is not the way to do it by any means.

[Greg]

I used 1/2" OSB with Tyvec on our daughter's. Greg