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- xeriscaping
Type of landscaping that requires little if any irrigation; suited to dry and drought-prone climates; generally relies on regionally adapted native plants.
- XPS
Extruded polystyrene. Highly insulating, water-resistant rigid foam insulation that is widely used above and below grade, such as on exterior walls and underneath concrete floor slabs. In North America, XPS is made with ozone-depleting HCFC-142b. XPS has higher density and R-value and lower vapor permeability than EPS rigid insulation.
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