ZIP System roof sheathing provides a sound substrate with an integrated air and water barrier
ZIP System roof sheathing panels from Huber Engineered Woods were installed at the Model ReModel East home following the same process used for walls. All seams are taped with ZIP System Flashing Tape in a sequence that includes rolling the tape to activate the adhesive, and that ensures proper overlap to promote water drainage. Taping begins with vertical seams in the first course of sheathing, then moves up to the first horizontal seam, then to vertical seams in the second course, and so on.
(For more information, see “Roofing Details for Storm Country,” Pro Remodeler, Feb. 2019.) Membrane provides added protection at valleys , and will be topped with a metal valley when the standing-seam roofing metal is installed. Although ZIP System roof sheathing panels do not require underlayment for most roofing materials, some metal roofing manufacturers specify a slip sheet, as was the case here .
 Membrane provides added protection at the long valleys created by the addition roof, and at the smaller valleys over the relocated entry, shown here.
 Although underlayment is not necessary with most types of roofing when ZIP System sheathing is used, some tile and metal roofing manufacturers require a slip sheet, which can be installed on top of ZIP System sheathing after all seams are sealed.