:)
It may be down to humidity ,you say the island has a humidity problems. Placing the tile over the waterproof concrete which-prevents air flow over the surface, creating a cold spot, resulting in condensation. Or , some waterproofing membranes are waterproof yet vapour permeable, (allow...
You might have timber decay issues, as their is some evidence of staining around nails in the timber flooring. In any case you will need to get under the floor to inspect.
Quite often you get what you pay for, meaning ,the price might reflect in the quality and experience of the tiler. By all means get several quotes, however if you are willing to pay peanuts you may get monkeys.
disclamer- no idea what tiling rates are in this area of the country. To me £40 m2...
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