Hmmm, 11 years out of a teak deck
is not much, would have thought 15 to 20 years with care would have been possible.
If it is just your ‘corking’ that is failing, Sikaflex as you call it, this can be scraped or routed out and be replaced. All relatively easily, yes, time consuming and messy though. If your teak is not screwed down and relatively intact, this might be a solution.
Removing all the teak is a messy task. Flexiteak and other PVC based equivalents can be then installed, is longer lasting and virtually no maintenance
. Another possible solution is ‘Marinedeck’, a cork product, more time consuming to install, but IMO better on the eye, and better feel on the feet.
Whatever direction you are going with this, it will be a big job.