omits

I have aquired 9m2 of 90w x 18mm strips (1.2, 0.6 & 0.4m long) of solid oak flooring and want to know how to lay it. I have a kitchen floor which I will remove the 18mm chipboard (there is no option to lay over). The joists are 50mm wide and about 450mm apart. I guess there must be some sort of moisture layer as the floor is 450mm to a concrete platform and vented to the outside. Advice would be much appreciated.