A massive amount of ice accumulated on the upper roof and on vent stacks causing icicles to form and hang over the lower roof. Icicles, some as long as 9 m (30 ft), broke free and punched through the lower roof.
Wood shoring and temporary ice shields were designed for the lower roof to protect mill services and personnel from additional falling ice.
A composite concrete deck was designed for the lower roof, and built in the spring, to provide a more robust roof and better protection from falling ice. The upper roof decking, damaged by massive ice accumulation, was restored with a higher load capacity metal deck.