I was planning on doing a 28x30 garage on a slab. I was wondering what the procedure is? I have a rough idea, but am a little confused as to if I need to put footings in? I live in NH frost line goes 4 feet, any help much appricated?

Most slabs do not have a true footing but use a thicken edge or club foot. How to pour a concrete slab - by Raymond Alexander Kukkee - Helium (http://www.helium.com/items/1122278-how-to-pour-a-cement-slab-pour-a-concrete-slab-build-a-concrete-slab-foundation)