3 Answers

....consult/hire professional roofers 

....there may be mold concerns

Replace the wood, make sure the new wood has a protective coating…….

protected wood-frame construction Definition Construction in which roofs and floors and their supports have minimum fire resistance ratings of one hour, and stairways and other openings through floors are enclosed with partitions with minimum fire resistance ratings of one hour. Such construction must also meet all the requirements of wood frame construction.

In 2016 link when link the Mark XVIII was announced Ben Clymer said in link his coverage "You asked for it you got it. Here is the IWC Pilot's Watch you've been waiting for." Well it turned out that enthusiasts had their share of gripes. So now after the six-year run of the Mark XVIII maybe this is the one you've been waiting for