Nj Insulated Duct Unconditioned Attic

Duct shafts utility penetrations knee walls and flue shafts opening to exterior or unconditioned space are sealed.

Nj insulated duct unconditioned attic.

The 1 800 square foot brick ranch in climate zone 4 dates from the 1960s but the previous owner installed both a furnace and ductwork in the attic just four years ago. Ducts must be tested for tightness as specified in iecc section 403 2 2 except where the air handler and all ducts are located within conditioned space. Air permeable insulation is not used as a sealing material. Common attic air leaks this image shows how and where air can easily escape from a home s attic.

All other ducts shall be sealed and insulated to a minimum of r 6. 9 out of 10 homes in the u s. Insulate and air seal any knee walls vertical walls with attic space directly behind them in your home as well. Supply ducts in attics shall be sealed and insulated to a minimum of r 8.

Batts in narrow cavities are cut to fit or narrow cavities are filled by sprayed blown insulation. Ted also has inherited a powered attic ventilator. Air permeable insulation is inside of an air barrier. The unconditioned space also houses his hvac system.

In addition if you re building a new home in new jersey or remodeling make sure any attic decking that provides additional storage space or a platform for a heating and or cooling unit or hot water tank is raised above the ceiling joists to leave room for adequate insulation. Ted has more than a few cobwebs in his attic.