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Re: Jeanneau Poker 28ft - Teak Deck Fix or Remove?
Most screwed down teak decks can be over-hauled and be re-made to 'water tight' - drill out the bungs (portable drill press using a 3/8" 'forstner' bit to drill), remove the screws, remove the strakes, inspect for rot in the core, slightly 'mill' the strakes and epoxy them back down using sand bags to hold in place during the epoxy 'cure', re-bung (no screws needed), caulk the seams, sand the deck ... and then use a deck 'sealer' evermore to prevent UV burn and erosion of the surface.
The first thing Id inspect is for water dripping down from any of those screws that penetrate through the bottom underside skin of the deck. This will determine if the core will also need to be replaced. If the core is wet and also needs to be replaced and new core installed - this is a backbreaking arduous job that will have to be done whether you reinstall the teak or not.
Second and probably most important is to determine which type of screws were used. Most decks are screwed down with 'shoulder' screws - the threads of the screws DO NOT 'run' the entire length of the screw length but leave a small non-threaded length 'just under' the head of the screw. This is to allow thermal expansion of the wood; however WHEN the wood becomes thinner and the screws are driven deeper the (thread free) shoulder portion will not 'hold' into the fiberglass and every damn deeper driven screw can be a source of a leak into the core when the 'caulk' on the underside of the teak strake becomes loose. If 'sheet metal' screws (full length threads) were used, screw leakage into the core is usually not a problem. If 'shoulder' screws were used and there's not much of thread engagement of those threads into the fiberglass deck top skin and the wood is now much thinner and only the caulk on the underside of the teak strakes is holding the strakes to the deck - definitely rip off the deck in its entirety.
If sheet metal screws were used, you have a chance of a successful overhaul of the teak; but at a minimum, Id remove all those 'too long' screws and seal those penetrations through the bottom skin with thickened epoxy.
An 'overhaul' is usually less time consuming ... but will not correct a 'wet core'. Since a lot of your deck bottom skin is already penetrated by too long screws, pull a few and investigate for core rot. For those areas not penetrated, simply use a VERY small diameter drill bit and 'investigate' from the underside - wet brown drillings from the deck underside will make you 'very sad'.