I’m face nailing my new hardwood flooring (Tasmanian Blackwood 19mm x 130mm) then puttying the knot holes and nail holes. This will be done through the whole house. The subfloor is Particle Board (Brand name: Yellow Tongue) that has been glued and screwed down.
In the bathrooms I want to do a boat deck look. To accomplish this I’m going to waterproof the subfloor (there is also a floor drain in the event of flooding) then use strips of Dupont Flexwrap under the hardwood, between it and the waterproofing in the nail areas only so when nailing it will seal the nail holes. Finally I will use black Sycaflex or a comparable product to seal the spacing lines (I will be leaving equal spacing between each board) after I have applied a water resistant finish. SO, is the Dupont Flexwrap needed to seal the nail holes or is this just overkill?