All circulating service hot water piping will be insulated to at least R-2.
Mechanical Systems - Mandatory
Mechanical system piping that is capable of carrying fluids above 105 degrees or below 55 degrees will be insulated to at least R-3.
Building cavities will not be used as supply ducts.
All duct joints and seams, air handlers and filter boxes will be sealed with mastic.
All HVAC supply and return ducts will be insulated to R-8 if they are located outside the building thermal envelope. R-6 ducts are allowed in floor trusses.