X-factor design
Unique visual appeal in simple shapes.
XPS insulation
Extruded polystyrene for high-load zones.
Underfloor insulation
Thermal resistance below living areas.
Xenon lighting (legacy)
Replaced by LED in Oktogreen.
X-joint sealing
Cross-connections between elements.
X-axis layout
Grid-based orientation in site design.
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.