Double Stud Wood Frame with Stucco or Veneer

Detail of Flanged Window in Double Stud Wall with Stucco

R-45 Wall

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Head

(Detail 1/3)

Sill

(Detail 2/3)

Jamb

(Detail 3/3)

Notes

This window detail uses a two stage seal to insure no water or air can infiltrate into the building. The exterior seal is installed by applying WRB tape into the rough opening, onto a back dam and over the window head flange. No tape should be applied over the window sill flange to allow the window to drain. The interior seal is added by installing a full perimeter backer rod & sealant joint. Expanding foam or special tapes can be used instead of sealant, however a backer rod should still be installed to prevent the foam from completely filling up the cavity and preventing the system to drain. Plastic shims should be used to level out the window in the rough opening. These shims elevate the window slightly, which creates a space for water the drain.

A drainage mat covered with building paper or vented airspace needs to be installed between the stucco and the sheathing in climates that receieve more than 20" rain per year to allow the wall to properly dry. See the Cladding Notes section below for more info.

*Whether or not you should use a Class II or III Vapor Barrier depends on your climate zone and location. Refer to Wall Barriers Notes section below for more info.

Building Science Courses on Acelab

How to detail drainage mat with stucco

How windows manage water

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Double-Stud Wood Frame Wall

Design Requirements

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Recommendation & calculations are based on the methods described in the Builder’s Guides from the Building Science Corporation and are only valid for residential occupancies.

Notes

This wall is designed with a vapor semi-impermeable stucco finish. Therefore a Class II Vapor Retarder needs to be installed in Climate Zone 5, 6 or 7. Class II Vapor Retarders can be either separate membranes, like 'Smart Vapor Retarders' (SVR), or kraft facing on the cavity insulation.

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Smart Vapor Retarder (SVR)

Class II vapor retarders with variable permeance that block vapor in low, but not in high humidity conditions.