Building Paper Applications
Overlap subsequent courses behind paper previously installed at
Drip cap
Sealant
Corner gasket
Cut membrane at head jamb and fold back.
Fold and adhere membrane to jamb.
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.
jamb.
Tuck bottom double ply layer of building paper under paper at sill.
(c)
Install building paper over window head.
Extend 6″ past paper at jambs on either side.
(a)(b)
(d)
Figure 18: Sealing the Installation in building paper 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 done already, 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 18a.
3.Lap vertical strips of self sealing adhesive membrane onto the unit or casing and out over the air barrier or building paper. Make small cuts at the head jamb to allow the membrane to fold back onto the exterior. See figure 18b.
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 cover flashing membrane previously installed at jambs. See figure 18b.
5.Tuck a double ply layer of building paper under the sill flashing. At the jambs, install a double ply roll beneath the jamb flashing overlapping the previous course by at least 2″ (51). Continue installing courses beyond the height of the window unit as shown. See figure 18c.
6.Size and cut a double roll of building paper to bridge the opening between the paper courses at the sides. This course should extend past the paper previously installed by at least 6″ (152). See figure 18d. Proceed to the “Final Sealing Procedures” section.
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