Northern Light
Superstar
As someone who worked in construction when I was younger, its very rare for renovations to remove the old tile/flooring etc in commercial and rental spaces etc. That's really only something people with a nice house and lots of money do. More often than not they just cover up the old tile/flooring, unless there is a reason they can't.
I know its a common choice, just like w/roof shingles, put another layer on until you can't.
But its never the ideal choice; its the cost-effective choice...............IF, you do it properly of course.
I was pretty young when the TTC was re-doing Line 1 stations downtown, so I can't be sure how they did it, but I believe they just tried to adhere it.
Now they use a different system.
That said, I'm not a fan of leaving the old, because the old can be hiding problems w/leaks, w/structure etc.
Better to strip down to studs (or concrete or tunnel liners) and make sure everything is good before building new. Its more expensive in the short-run, but should lead to longer-lasting renos.
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