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Retrofit Wall Technology



Figure 1 Side views of retrofit vinyl siding configurations

Figure 2 Corner details for the flanged vinyl replacement window

Description Of Wall

The test specimens were constructed to represent typical building practices, with 3.8 x 8.9 cm (nominal 2 x 4 in.) framing members placed on 0.4 m (16 in.) centers, 1.3 cm (1/2 in.) gypsum wallboard screwed and taped on the metering side of the wall, and the cavity space between studs filled carefully with R-11 fiberglass batts. The wall’s exterior sheathing was constructed of 1.3 cm (1/2 in.) plywood rather than the more common particleboard because this surface was subject to repeated fastenings as the siding was modified between tests. With this typical construction, 85.8% of the area is covered by insulated wall cavities, 10.5% by vertical studs, and 3.7% by horizontal tracks.

Thermocouple positions on the clear wall were maintained in the same location for each successive test configuration. The thermocouple positions were adjusted to provide more information around the window area for the window/wall combinations. See Figure 5 and Figure 6.

Specimens, 60 x 60 cm (24 x 24 in.), taken from the insulation materials used in these tests were characterized independently using a heat flux meter apparatus in accordance with ASTM C518. These tests were conducted at a mean temperature of 24 C (75F) with a 17 C (30F) temperature difference.


Figure 3 Photographs showing thermocouple placement on clear wall front and back and on interior window wall



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