Quoted from PINBELL:I'm thinking of moving pins to upstairs room. Question is, will 21 pins be a strain on the floor/ceiling over the living room? Catastrophic pin-drop would probably lead to a divorce!!
That can only be answered when several items are identified...size/ spacing/ type of floor joist, construction method, deck surface, to name a few. Unlike a waterbed ( sadly) your weight is not evenly distributed over a large area. You will also be dealing with dynamic load ( people) assuming the games are being played...ALOT of weight randomly put up there.... I would highly recommend hiring a reputable SE ( Structural Engineer)to inspect and provide a stamped drawing of the area in question....had a similar situation when I reworked some load bearing beams in a house several years back....total cost for SE's services with drawing was somewhere around $650.00....a small price to pay (IMHO) to insure everything is good, peace of mind, and accountability......
You stand to risk much more than an angry Spouse if things go bad......safety first...please don't play around with this...good luck.....mark