What kind of cement mix is used for extruded curbing? How is this different from other cements?
Extruded curbing is placed using a unique mix which is drier than other concrete mixes. It will cure faster and the finishing process can be completed sooner.
Extruded curbing is placed using a curbing machine and then finished by hand.
Factor that affect the cost of an extruded curbing job are: (1) Amount of removal/excavation to complete (2) Total lineal feet to place (3) Total number of locations and (4) Mold/uniqueness of the mold/shape.
Yes, extruded curbing should be placed on a solid base, either asphalt or concrete. It should not be placed directly on top of dirt.
If roots are causing the curb to bulge upward, it is necessary to remove the curb, sub-base and the roots. Extruded curbing should not be replaced without removing the roots.