July 11th Clemson Historic Picture And Trivia Quesiton Of The Day

Today’s photo is a familiar tradition from the mid 1980’s, showing a sign students erected on the outer façade of Johnstone Hall.
This was often done when a big game was going to be played in Death Valley in the coming weekend.
Trivia Question
Johnstone Hall was built with a unique engineering method. What was that method?
(Place answer in comments)

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The Youtz-Slick "lift-slab" method - lifted reinforced concrete slabs onto columns with hydraulic jacks. These slabs weighed 224 tons and were nine inches thick, 122 feet long and 43 feet wide. Johnstone Hall was the largest building complex erected using this method.