House is sided with Masonite fibreboard, 21yrs and has been painted twice. The contractor will replace any water damaged board (mostly the bottom 12" on the North side) with OSB and wrap the siding with Tyvek. I don't know that I like that approach. Contractor claims the siding will act as a good insulator. The Hardi planks will cover the Tyvek'd fibreboard siding. I don't know what the lifespan of the fibreboard is but the Hardi siding is good for 50+ years.
I was surprised to hear of this procedure since I was thinking the old board would be removed then poly board installed and that then Tyvek'd.
Is the contractors plan sound? Thanks!