Transcription of R-VALUES AND U-FACTORS OF SINGLE WYTHE TEK 6-2C …
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R-VALUES AND U-FACTORS OF SINGLE WYTHE TEK 6-2C …
An information series from the national authority on concrete masonry technologyNCMA tek 6 -2C (replaces tek 6 -2B) 1R-VALUES AND U-FACTORSOF SINGLE WYTHE CONCRETE MASONRY WALLSTEK 6-2 CEnergy & IAQ (2013)INTRODUCTION SINGLE WYTHE concrete masonry walls are often constructed of hollow units with cores filled with insulation and/or grout. This construction method allows insulation and reinforcement to be used to increase thermal and structural performance, respectively, without increasing the wall thickness. U-FACTORS and R-VALUES are used to estimate heat flow under steady-state conditions (neglecting the effects of thermal mass). These steady-state values can be used in conjunction with factors such as thermal mass, climate, and building orien-tation to estimate a building envelope's thermal performance, typically using software.
NCMA TEK 6-2C 3 hybrid system uses the two-web units described above for areas requiring a grouted cell, and a one-web unit where grout confinement is not required.
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