A cursury search shows they mostly use CMU ( concrete masonry units ) aka, blocks. The floors and roofs are typically still wood frame construction. https://bl

A cursury search shows they mostly use CMU ( concrete masonry units ) aka, blocks. The floors and roofs are typically still wood frame construction. https://blog.icihomes.com/2010/03/19/concrete-block-vs-engineered-wood-frame/ https://blog.icihomes.com/2010/03/19/concrete-block-vs-engin...