Junction box under attic floor
I have several junction boxes in my attic covered with insulation. These are clearly marked and readily accessible. So, I don't think these are code violation. I installed a box against a ceiling joist and put a 12"x48" particle board plank on top. The board works as floor but it's easily taken off by removing screws. I would like to know if this is OK or against NEC. My original thought was this is somewhat similar to a box istalled inside suspended ceiling. I appreciate any suggestion. Thank you.