Continuous Air Barrier Systems - Flashing the Installation
Air Barrier Applications
Drip cap
Sealant
Corner gasket
Cut membrane at head jamb and fold back
Fold and adhere membrane to jamb
Seam seal tape
Install adhesive membrane at head jamb to cover drip cap and membrane at jambs.
Install adhesive membrane to cover paper and lap onto window jamb.
(a) | (b) |
Fold air barrier down over membrane.
(c)
Figure 17: Sealing the installation in air barrier applications.
NOTE: Illustrations and text in this section refer to units built without brick mould casing or flat casing. Procedures are identical for windows with casing un- less where noted.
IMPORTANT: Nailing fin is not designed to be a weatherproof flashing.
1.Apply nailing fin corner gaskets to each corner of the nailing fin. Follow instructions on back of gasket.
(Units with clad flat casing do not use corner gas- kets.)
2.If not completed, install a drip cap along the head jamb or head jamb casing. Be sure to apply a bead of sealant along the back sides of both vertical and horizontal surfaces of the cap that come in contact with the window, window casing, and/or sheathing. See figure 17a.
3.Lap vertical strips of self sealing adhesive mem- brane onto the unit or casing and out over the air bar- rier. Make small cuts at the head jamb to allow the membrane to fold back onto the exterior. See figure 17b.
4.Install another layer of adhesive membrane lapping onto head jamb of unit and over sheathing. Mem- brane flashing at head jamb should extend and cov- er flashing membrane previously installed at jambs. See figure 17b.
5.Fold head jamb air barrier down over the head jamb flashing. Apply seam seal tape over the diagonal cut in air barrier. Make sure the tape laps onto the unit or casing. Tape and seal any seams and fasteners directly above the unit. See figure 17c. Proceed to the “Final Sealing Procedures” section.
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