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I have a quite similar boat (Tayana) and indeed screwed down teak decks from this era of construction, unless meticulously maintained will be: teak screwed (about 3500 holes) into the upper FRG, sometimes even into the core, but not the FRG below the core. Core is usually a 'light weight 'end-grain'; but not 'balsa'. As others with actual/direct knowledge will testify, a screwed down teak deck will only usually last approx. 15+ years; if rigorously maintained maybe slightly more. What I mean by rigorously maintained is 're-bunged, re-screwed, re routed, and recaulked ... and then sealer applied. If its 'grey', the wood grain is erroded, more than just one or two bungs are loose, a few 'age-splits' here and there .... you probably wont need a 'moisture meter'.
From thermal expansion over all those years usually you will find that the Thiokol adhesive between the teak and upper FRG layer has lost its 'grip', the screws - especially at the butt end joints of the teak strakes - will have 'sawn' themselves loose from the FRG, and when/if you pull a few screws some will indeed come up with rot attached.
Quick inspection: With your full body weight, PUSH your foot/heel down on the butt end joint boards. if you see any up/down 'movement' of the butt ends of the strakes ...... .
Restoration can be either an expensive job or very time consuming DIY job. If you have any doubts about: the integrity of the underdeck/core; or your abilities in restoration; or expense in having the restoration done by others .... seek out a boat with 'no teak deck'.
Still, there is nothing better under a wet foot than a teak deck.
Last edited by RichH; 02-07-2011 at 12:24 AM.