College Planning & Management

OCT 2012

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REBORN ON THE BAYOU In this case, the plan is to help keep the wall dry by actually allowing some vapor diffusion so that the moisture can escape and not build up in the wall. The permeable vapor air barrier keeps water bulk out but allows some vapor diffusion. Plus, the aged historic building is not "hermetically sealed," as new construction might be. Insulation: Spray Foam (Open or Closed Cell) or Other? In addition, the insulation was also an important factor for preventing moisture build-up and still providing additional insu- lating value to support the sustainable approach. An application of spray foam insulation was considered. There are two forms of spray foam insulations, open and closed cell. Both have pros and cons. The open cell spray foam insulation is vapor permeable; more environmentally friendly for an interior application using a water-based blowing agent; has a soft, fl exible composition; has an R-value of 3.7 per inch; is not meant to be exposed to bulk water; requires stable substrate (the existing masonry wall is rough in places); and does not qualify as an air barrier. The closed cell spray foam insulation is an impermeable vapor barrier that meets the ASTM E2357 requirements of Meet Higher Standards for Rooftop Safety Railings minimum 2.0 lb. density to also be considered an air barrier (thus not requiring application of liquid applied air barrier); requires special installation procedures; has a rigid, non-fl exible composition and an R-value of 6.0 per inch; and can be exposed to bulk water. Both spray foams did not completely address the issues. There- fore, extruded polystyrene (XPS) was considered. XPS allows vapor permeable application, more R-value than the open cell spray, is not damaged by bulk water, and can be applied to the unstable substrate of the existing wall. The application of 1-in. XPS rigid board sheath- ing (also adding an insulating R-value of 5) to the existing plaster wall with liquid applied vapor permeable air barrier was determined to be the best scenario for our described conditions. The fi nal proposed assembly of the exterior envelope is shown in Figure B. Actions undertaken in restoring the San Jacinto Memorial Building include: • Removing the multiple layers of coating from the exterior ma- sonry façade to expose original building intent; • re-pointing the masonry joints; • replacing the existing windows and doors with historically sensi- tive, energy-effi cient windows and doors and treatment of exist- ing lintels and minor masonry replacement and repair, including completely new window sill and jamb fl ashing; • adding a pre-manufactured metal coping system with factory pre-formed, mitered, and continuously welded corners; • applying 1-in. XPS rigid board sheathing (also adding an insulat- ing R-value of 5) to the interior face of the existing masonry mass wall without disturbing the existing plaster; • the application of liquid vapor permeable air barrier to inside face of XPS; and • fi nishing with metal stud furr-out with painted gypsum board on interior, providing a chase for power and data for new tech- nologies without disturbing the existing aged wall. As part of the initial project research, considerable historical UÊ ii Õ>À`® Ê Ã«i`ÊÀvà ʫiÀ>iÌÊv>Ê«ÀÌiVÌÊÃÞÃÌiÃÊvÀÊy>ÌÊÀÊÜÊ UÊ ÃÌ>ÊÜÌÕÌÊÜi`}]Ê`À}ÊÀÊ«iiÌÀ>Ì}ÊÌiÊÀvÊÊ Ê Ê iLÀ>i UÊ `iÃÊ>ÃÊ>Û>>LiÊvÀÊÃÞ}ÌÃ]Ê>ÌViÃ]ÊÃÌ>ÀÃÊ>`ÊÜ>Ü>Þà UÊ `Õ>ÀÊ`iÃ}ÊÌÊwÌÊÛÀÌÕ>ÞÊ>ÞÊÀvÊVw}ÕÀ>Ì UÊ >Û>âi`ÊvÀÊVÀÀÃÀiÃÃÌ>Vi Kee Safety, Inc., Buffalo, NY >Ê£näänx£x£n£ÊUÊ6ÃÌÊÜÜÜ° ii Õ>À`°V Safety at the Highest LevelSM information has been discovered that has raised the building's importance within the community, state, and nation. Based on the initial historical fi ndings, HCC has decided to pursue a listing of the property in the National Register of Historic Places. Although the San Jacinto Memorial Building has been remod- eled and added onto several times during the last century, this project will dwarf those other renovations in scope and scale. When completed, the remodel will have recaptured the building's architectural past while ensuring it has a long and productive future as a cutting-edge educational institution. CPM Lisa W. Lamkin, AIA, LEED-AP is a principal and Anne Hilden- brand, AIA, LEED-AP is a senior associate for BRW Architects, Inc. (www.brwarch.com). 28 COLLEGE PLANNING & MANAGEMENT / OCTOBER 2012 WWW.PLANNING4EDUCATION.COM

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