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R402.4.1.2 — Testing (Air Leakage) — Change Summary: Envelope testing is mandatory, no longer an option R403.3.3 — (Duct) Sealing (Mandatory) — Change Summary: (Duct testing required except when ducts and air handler are located within thermal envelope R403.3.4 — Duct Leakage (Prescriptive) — Change Summary: Sets maximum duct leakage at 4cfm/100 sq, ft. conditioned area, 3 CFIVI/100 sq. ft. if air handier not installed R403.6 — Mechanical Ventflation (Mandatory) — Change Summary: Requires whole house ventilation be installed C30322 — Multiple layers of continuous insulation — Change Sumrnary: o Where two or more layers of continuous insulation board are used in a construction assembly, the continuous insulation boards shall be installed in accordance with Section C3032 o Where the continuous insulation board manufacturer's instructions do not address installation of two or more layers, the edge joints between each layer of continuous insulation boards shall be staggered. C404.,2 —Service water -heating equipment performance efficiency— Change Summary: Water heater efficiencies. Updated to current federal water heater efficiencies, - C405.2 Lighting controls — Daylighiting controls, Change Summary: Lighting systems shall be provided with controls that comply with Sections C405.2.1 through C4052,6 with exceptions R403.3.6 — Buried Ductwork in Attic — Change Summary:: Where supply and return air ducts are partially or completely buried in ceiling insulation, such ducts shall comply with all of the following: * Supply and return ducts shall have an insulation R-value not less than, R-8, * At all points along each duct, SLIM Of Ceiling insulation R-value against and above the top of duct, and against and below the bottom of duct, shall be not less than R-19, excluding the R-value of the duct insulation * In Climote Zones 1A, 2A and 3A, the supply duicts shall be completely buried within ceiling insulation, insulated to an R-value of not less than R-13 and in compliance with the vapor retarder requirements of Section 604.11 of the International Mechanical Code or Section M1601.4.6, of the International ResidentialCode, as applicable o, Exception: Sections of the supply duct that are less than 3 feet (914 mm) from the Supply Outlet shall not be, required to comply with these requirements. R404.1 — Lighting Equipment (Mandatory). Not less than 90 percent of the permanently installed lighting fixtures shall contain only high -,efficacy lamps. Please Note: The Code Changes Listed Above Do Not Include All Changes to the Code