Every aspect of boards / tiles are parametric, length, width, thickness, spacing, bevelling and so on,
some patterns also allow random scale for parts eg Boards allow random length / width / offset.
See “Flooring” in the right panel of 3d view.
Archipack’s default material library provide only “default” materials sets and currently are not to be considered as render ready.
Any talented artist is welcome to contribute by providing render ready material library !
I’m also in touch with chocofur.com to make such library available to anyone.
In the meantime, you are able to modify materials (change their name!) and save them as archipack material sets, then store the materials into library using material library vx addon and save floor final aspect using a preset, so it will be available as preset for other projects.