Underfloor insulation
Thermal resistance below living areas.
Junction detailing
Smart construction of meeting points.
Joule efficiency
Efficiency of energy conversion devices.
Joist insulation
Thermal barriers within floor/roof joists.
Joint sealing
Airtight detailing of panel seams.
Joint layout
Seam alignment in panelized construction.
Utility room
Designated space for washing and storage.
User interface
pps or displays to manage building systems.
Urban heat island
Higher urban temperatures due to materials.
U-value
Measure of heat flow through a material; lower = better.