Thank you so much

Sorry but do you have a link to what the engineered boards you referred to as from what I read it said we can sand the engineered boards

Thanks for the detail information, should I add cement board ontop of the existing floor to make it level with levelling compound?

Is that fine to use engineered hardwood (4mm hardwood) over the current floor without the yellow tongue?

Yes I am, from Brisbane

Thanks, That solution is nearly perfect and that what we thought before. However the engineered hardwood is too expensive which is 4 x more expensive than vynl/hybrid planks which is being considered now.

The information ia great, thanks a ton. We will consider the option.

That is a very valid point but it will be very costly if we do removing the floor.

Thank you so much for the information, I wished I could have restored the floor but it is too bad with glue on and half hardwood and anothe half weak, rotten pinewood

We have the same concern as well but we plan to add the hybrid floor on top which is waterproof

Thanks, this is to gather to information and we will make the decision based on the information we get :)