Hi all, im looking to fit (DIY) solid wood parquet over 2 rooms and had questions about subfloor preparation. One room has floorboards that are in quite good condition except for a couple of spots. And i’ve just disovered the other room has quarry tile (i think? picture attached). My plan was to put down a 6mm ply subfloor in both rooms, screw it down in one but wondered if there was a particularly adhesive that people would recommend for the other room? and if this 6mm ply is an appropriate choice for both rooms, and whether I need to do any additional steps to board over the tile Also I initially planned to run this through both rooms without any threshold but im curious if it would be better practice to have a threshold due to the different types of flooring underneath the ply? Thanks.