Labels:press | sky | tree OCR: Thermal Performance U-values Frame Frame Higher R-values indicate that material better insulator. Type U-value Conversely materials with ower U-values are better insulators 1.92 The addition ofa thermal break (shown in blue) an aluminum frame improves the U-value 1.13 from 1.9 1.13 The aluminum-clad wood frame further improves the frame L 0.51 value from 1.13 to 0.51 Source 2001 ASHRAE Fundamentals Handbook Chapter 30 Fenestration Therma additio herma showr rame Fund amentals
