Is it ok to stack LPs horizontally?

Most turntables play slightly warped LPs fine. What they cant play are compressed recording grooves. LPs weigh a ton. Storing them flat can press the groves. vertical is the only way to go.

In addition to warping (which I never considered) I always thought that the extra weight of storing horizontally would cause dust and dirt to be pressed into the grooves. So I always store vertically. 

@heretobuy      Goodness, that rig looks highly unstable on its tiny angled feet.  Anyone who has lifted that number of LPs knows how heavy they are.

A dog or a small child could accidentally knock it over and the falling LPs cause injury or worse.  I wouldn't have it in my house.

Horizontal storage will cause excessive ring wear at bottom of pile.

Not just a warping issue but any dust or crap on an LPs surface with be further smashed into the groove. No no no.