Closed Cell Foam Weather Stripping is installed on the inside of the Joist Gutters and the Boundary Gutters at the ledger board on the structure. The Weather Stripping is available in 5 In. by 1 In. strips. Rolls are available in 250 count quantity. We recommend the Weather Stripping to form a barrier next to your house to ensure that the water will drain positively away from your home. Our system can then be used to create a myriad of uses such as: extra living area, storage room, screened in three season porch, as well as a drip free hot tub room! This System is easy to install with just 4 simple steps: 1) Snap a chalk line, 2) Tap the joist rails on, 3) Wrap the joist, 4) Cap off the joist with the Joist Gutter.