Why is the weight per foot of the same joist different between the load tables and the Economical Joist Guide?

The weights shown in the load tables are from the Steel Joist Institute and are based on the average weight of that joist for the industry. The weights shown in Economical Joist Guide are the based on Vulcraft only. More.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.