My contractor that built my deck has also installed a self design
underdeck roofing. His father,an engineer, designed it. Basically it
consists of 2x2 furring strips nailed and caulked onto the inside of
the floor joists and plastic panels caulked into place between them .
Then exterior plywood was installed as a ceiling. The system is leaking
in several places. They have attempted to repair it twice. Now they
want to use caulk to fill the spaces between all the deck floor boards.
Any thoughts?