I've removed the carpeting and am putting down new 1" solid maple treads and am covering existing pine risers with new 1/4 inch pine that will be painted white. Treads will be stained. Nothing is completely true or 100% level and I'm trying to figure if the tread should go down first with potential gaps being left under bottom of riser edge. Or, should the risers go on first, then treads, leaving potential gaps at head of tread. I think I'll be caulking afterward with clear silicone(?).