JOURNAL OF LIGHT CONSTRUCTION
7. Mainline Backflow Products Greenskin Envelope Seal
Flash pipe penetrations with less hassle using the Greenskin Envelope Seal. JLC says the 17-mil sheet works like a plumbing boot for sidewalls, but without the metal base. Use building wrap over the top edge and under the bottom edge, and you’re penetrations are good to go. Read all about this inexpensive, easy-to-use solution on JLC Online.