I have been instructed by the "boss" that she desires to enclose the attached garage and make a family room/pantry/breakfast nook. My question is: the garage was built with studs at 2ft, walls and ceiling. Am I going to need to add studding in walls and also ceiling per the 18" standard. I have concerns that if I keep the 24" ceiling spacing, I will have sagging sheet rock in the future. Truss construction is in the ceiling at present.