On Wednesday, June 18, 2014 2:10:56 PM UTC-4, Guv Bob wrote:
"Oren" wrote in message ...

On Wed, 18 Jun 2014 09:23:48 -0700 (PDT), jamesgang

wrote:



http://i249.photobucket.com/albums/g...n/add-room.gif



It's very unlikely that the ceiling joists in the garage are large enough to support a second story.



Nice catch, Mr. James. A tile roof will add further weight too.



Definitely no tile roof for me!

No matter what you use for a roof you need to carry roof loads to the ground via walls. Any 2nd story wall supporting roof needs to be sitting on top of a first floor wall. And if the house is more than 20-30 years old you should also have someone confirm your foundation can carry the load.