"Mike" wrote in message
I am thinking of buying more tapes and wrap the pipes more carefully
and tightly. Also, put some extra insulation on top of the pipes. Is
this enough? Last winder the lowest temp was -10F here.

If not, what's a good solution of the problem.

You want to insulate between the pipes and the cold side. You want to let
the heated air in on the room side.

Insulating the pipes may not help over time. If the pipe is wrapped and no
other heat source, the heat will eventually travel from the water to the
cooler area and freeze the pipe. It just takes longer if insulated but if no
heat is added, it will lose what heat is there.