How much weight can an upstair room can hold?

Andrewdoan

I am a carpenter, general contractor and builder of all things great and small for my entire life.

A 10 year old house following the standard building codes would allow for 40 pounds per square foot of live load for your floor. Taking 1 room of 14 x 16 with a total of 224 square feet x 40 = 8,960 pounds equally distrubited throughout the room. A 300 pound refrigerator of 33" x 36 " = 36 pounds per square foot. These days lots of folks weigh in excess of 300 lbs. and occupy 1 square foot. I have never heard of someone falling through a floor or colapsing a floor. These loads a very conservative

You have absolutely no worries for your stereo or anything else in your home.

The crack is probably a drywall seam.

Enjoy your system and stop worrying.

Leatherneck 1812, thank you for the assurance . Now I have something to show to ther other half that the crack on the garage ceiling does not come from my heavy gear located in the bedroom above. It's bad enough to be confined " out of sight" these black "boxes" in a small square feet room....

Andrew- If the crack is in your garage ceiling and the garaage is unheated, its probably a thermal expansion/contraction thing, esp w a heated/cooled room above.