Let no vageriey go unanswered - respond by printed word. "R101.2 Scope. The provisions of this code shall apply to the construction, alteration, enlargement, replacement, repair,
equipment, use and occupancy and location of detached oneand two-family dwellings... ALTERATION IS "ALTERATION. Any construction or renovation to an existing
structure other than repair or addition that requires a permit. .....
So that which you Alter Expand, Add must comply .. To me that means 10% touch that must comply , 40% touch that must comply, 80% touch that must comply.
ther is no (Unless in your establishment clause other the Floodway construction (50 substantial must meet flood design standard) but even that does not say that the building must now comply with the "Newest latest and greatest cod it must be elevated and structured to resist the flood conditions. Old Furnace properly elevated; old windows properly elevated thats what the code says.