"Claudio" wrote in message
I want to add a second floor to my garage, which is made of cinder
block 21 x 22 feet. I am very new at woodwork and my English is pretty
poor. So please be patient with me. I need some input about my design
for the second floor, which will be used as storage, not a living
space.

Might help a bit to also indicate what extremes of weather you experience
through the year.