X is for XPS Foam

XPS Foam, or extruded polystyrene foam, is a type of rigid foam board usually used as insulation. It's very useful in construction as it's water resistant, easy to cut and work with, and very effective at insulating from heat and cold.It comes in thicknesses between ½ to 2 inches, and convenient sizes from 2x2 up to 4x8 feet.For our purposes, XPS is also incredibly useful in model building. It