In fairness foundations require concrete too so if anything I've been a thrifty builder.
Wouldn't trust me to build IRL though if I were you.
You can use wood for foundation, it's next to the concrete option.
Wood is required in both foundation options, wood + concrete / wood + steel. Oddly I find that despite supply lines etc it's wood that I'm lacking most even with high strength and various carrying weight perks and scrapping ALL the things.
@edscoble started
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In fairness foundations require concrete too so if anything I've been a thrifty builder.
Wouldn't trust me to build IRL though if I were you.