I've got the best answer from a forum a while ago, and it goes like this: "There isn't one. It depends on the age the materials used, the distance ...
MelBrandleMember since 02/24/14
What project are you working on now?
I am working on my garden, putting some trees and flower.
What is your favorite tool?
The wrench of course.
I was just commenting on another page that's important to spread the weight as much as possible. What you can do is to get a form of "flooring" or ...
I think the most important thing is to make sure the beams you're supporting everything on are reinforced to the extent of load you're gonna to be ...
I have the the same problem, I will check the drains/traps, thanks for the advice.