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birdman 6 year s ago
#3... Concrete no longer lasts? No way! Modern concrete lasts way longer than 50 years in fact it is constantly getting harder ... never stops. Unless not mixed right in the first place Check out what the Germans built 70 years ago on coast lines .... not even phased after 75+ years
Central Heating
One of the first known HVAC systems was created by the Romans. Called the “hypocaust,” it was found mostly in large public bathhouses. With a raised floor and a constanting fire, it both heated the room and the water going to the bathhouse.
-1
1.
birdman 6 year s ago
#3... Concrete no longer lasts? No way! Modern concrete lasts way longer than 50 years in fact it is constantly getting harder ... never stops. Unless not mixed right in the first place Check out what the Germans built 70 years ago on coast lines .... not even phased after 75+ years