Marvin Window manual Final Installation Procedures, Sealing recessed masonry openings

Step 4: Final Installation Procedures

This section does not include details on sealing installations that incorporate a continuous air barrier system such as house wrap or building paper in standard wood frame construction. For flashing details in this application refer to the section, “Continuous Air Barrier Systems -- Flashing the Installation”.

	Backer	Sealant
	rod
	Sealant
(a)	(b)	(c)

Figure 13: Sealing recessed masonry openings

1.Place a bead of sealant at the wood buck to masonry joint. See figure 13a.

2.For recessed masonry applications, Marvin recom- mends sealing at the buck to frame joint with ap- propriate width backer rod and sealant around the en- tire perimeter. Finish as applicable local code dic- tates. See figure 13b.

3.In some situations such as recessed masonry openings, you can use frame expander or other clad accessories to finish the exterior. If this is the case, apply a bead of sealant between the acces- sory and the masonry at the head jamb and jamb sections. Leave the sill portion unsealed to allow water to escape. See figure 13c.

Low expansion foam

Fiberglass insulation

Figure 14: Insulating the rough opening

4.Apply a 1″--2″(25--51)thick bead of low expansion foam insulation on the back side of the nailing fin, brick mould casing or other trim. Do not apply too much as it is possible to bow the jambs. Now insulate loosely around the window with fiberglass insula- tion. See figure 14.

5.Interior and mullion trim: Install mullion trim after interior trim or casing is applied. On Ultimate Double Hung units, be sure to use nails and sta- ples that are no longer than 3/4″ (19). Place fasten- ers at least 1″ (25) from the edge of interior jamb liner.

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