B20−Exterior Vertical Enclosures

Category Archives: B20−Exterior Vertical Enclosures

Designing Masonry Buildings to the 2012 Energy Code: Thermal Mass Basics

A material’s thermal mass denotes its ability to store heat within a cycle of time. K-values, generally calculated on a 24-hour cycle, are important because they give general references to a material’s capabilities for storing heat. All materials may be considered for use in a thermal mass calculation, but steel, aluminum, and other metal claddings tend to cycle too quickly, while wood tends to cycle too slowly to offer desirable design values.

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Designing Masonry Buildings to the 2012 Energy Code

All images courtesy Mortar Net Solutions

The 2012 International Energy Conservation Code (IECC) will bring tremendous change to the way buildings are designed, constructed, and renovated. For example, the insulation requirements for masonry construction have been written to higher performance levels. The prescriptive energy code for the masonry industry is based primarily on the requirement for continuous insulation (ci) within the wall envelope. This becomes an issue when one looks at the standard concrete masonry unit.

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Specifying Stone Design: New technologies increase opportunities

Photos © Steve Maylone

This article looks at stone design, highlighting case studies that demonstrate success with sandblast projects. It also examines new technologies that have improved detailing for stone manufacturers. Finally, the piece explores sustainably green aspects of natural stone and how its use must include an assessment of the building material in terms of its complete environmental impact, from quarrying and fabrication to transporting and installation.

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Overlooked Considerations for Windows and Curtain Walls

Photo © BigStockPhoto/Zhiwei Zhang

The primary factors most designers consider when selecting window and curtain wall systems for their projects tend to involve cost, appearance, and energy efficiency. However, other considerations—such as weatherproofing, performance, and durability—can also be critical. Understanding material options, along with aspects like performance data and perimeter detailing are crucial.

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Selecting Joint Reinforcement

Photo courtesy Neumann/Smith Architecture

In a time of increasing complex walls, the masonry industry is striving to rediscover the simplistic principles that made it the material choice of the greatest civilizations in history. The principle “less is more” holds true when it comes to selecting wire reinforcement for reinforced masonry wall systems. Standard 9 gauge ladder shape wire fabricated with butt-welded cross-rods spaced 16 inches on center better facilitates code required rebar centering, grout flow and consolidation, and shrinkage control.

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Testing Glazing in the Field: Performance Classes

Up until the 2008 edition of American Architectural Manufacturers Association/Window and Door Manufacturers Association/Canadian Standards Association (AAMA/WDMA/CSA) 101/I.S.2/A440, North American Fenestration Standard/Specification for Windows, Doors, and Skylights (NAFS), there were five performances classes of windows with differing requirements for test pressures, allowed leakage rates, and other variables. This sidebar discusses the current four types, and their minimum performance grades.

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