what is the purpose of vinyl j channel for siding
J-Form is a flexible vinyl j-channel designed to provide a finished edge for most profiles of vinyl siding. J-Form is especially applicable on irregular shaped applications such as round, oval, half-round and other curved and shaped windows, louvers, etc. J-Form is not limited to straight line applications like rigid j-channel and can easily be adapted to conform to any shape by cutting slits on the nailing strip.