One more point regarding storage and house construction. If you have joists, then you should be fine putting weight up there. Joists are meant to hold floors. If, on the other hand, your house is built with trusses (like mine) then minimum attic flooring, placed strategically for moving around in the space to attend to wiring and such, means that you shouldn't store heavy things up there, not in a concentrated spot, unless you can position it above a bearing wall.

I wouldn't put LPs in the attic for various reasons. Heat, humidity, and the work of hauling them up there.

For what it's worth,

SRS