Marcus Chen, a senior project manager for a high-rise in downtown Seattle, stood on the windswept 30th-floor balcony. 400 feet below, traffic crawled along Elliott Avenue. Above him, the new aluminum curtain wall gleamed—thousands of panels designed to withstand the Pacific Northwest’s mood swings: freezing rain, summer heat, and the perpetual damp.
Marcus thanked her, hung up, and made his decision. astm c920 class 25 vs class 50
“ASTM C920, Class 50. That’s what the engineer wrote.” Marcus Chen, a senior project manager for a
But for the tower that had to survive Seattle’s wind and sun? Only Class 50 would do. and made his decision. “ASTM C920
Elena walked in with coffee. “So? Class 25 for the south and west? Or we wait three weeks and lose our crane rental?”
The Sealant That Saved the Tower