3/8" gluedown engineered will meet up with tile almost level. It's all that's done here where we regularly have 95% humidity mornings.

Thanks , we considered that but had two concerns . First , given that it's a cottage , there will be times when the whole system , heat, water, etc will be shut down , mostly in the winter and we were afraid that the expansion and contraction associated with that could affect a glued down floor also , again because as a cottage , people will be in and out a lot , there could be a fair degree of wear that would mean re-finishing which , as I understand , is a problem with engineered flooring .

I was hoping tha there was a new application process for hardwood that I didn't know about such as a sheet underlay with a plywood overlay or something like that .
If not , we may have to consider tile throughout .

paul21: What did you end up doing? We are building a beach house on slab in Northern New Brunswick and are undecided on what to do about flooring. We will be installing engineered wood and tile and are concerned about cold, feel (hardness), and how to install.