VEVOR Pipe Heating Cable, 18FT 7W/FT Heat Tape for Pipes with Built-in Thermostat, Water Pipe Heat Cable Protects PVC Hose, Metal and Plastic Pipe from Freezing

No, this product cannot be installed in an insulated, non-vented, fully enclosed crawlspace under a raised addition (i.e., between insulated, enclosed joists).

It can be installed outside the drain pipe to prevent the pipe from freezing. If the temperature is low in winter, in order to better prevent freezing, insulation cotton can be added to better achieve the effect of preventing freezing and keeping warm.