I live in Kodiak, Alaska and would like to build a shop using timberframe bents and stress skins.  My question is regarding the type of concrete slab to pour.  Should I pour footings first and then the inner slab with tubing for infloor heat?  Or would a monolithic slab be better?  Either way I will place tubing and insulate under the main slab.  Our weather is coastal and wet rainy the majority of the time so the sub zero temperatures are not a factor most of the time.  I would appreciate any thoughts.  Thanks.  Steve