Shed roof screened porch
Looking to add on to my house. Just a basic screened porch on a concrete slab, 4x4 posts, etc. A few questions though:
1) Can I just cut through the existing slab and pour the required number of "footers" instead of cutting a whole section out? I live in SE N.C. so frost/freeze is not an issue. Also, the outboard end is the only side that needs "footers" to carry the weight of the roof, correct?
2) For the ceiling joists, can I raise them off the top plate so as to add more head room? Collar ties would perform the same purpose only further up the slope, right? Again, the main goal is to gain maximum head room while keeping an 8 ft. outer wall height.
Any help is appreciated.