Saved by a handy man

Derry NH

Description

Wind and rain side of house with no overhang. There is a window frame and wooden house siding boards that rot out. I have to fix this every year. I have fake wood frame to window now and still get rot on siding boards under the sill. Last year I cut the sill off due to rain bouncing off of it. I dig the rot out and old fill in but keeps rotting. What can I use for a water proof fill to the voids left from the rot? Frantic old man needs help.