They abound over basements , builders say . ` ` We do 'em all day long , '' says one who has built many in the Oklahoma City area . `` There 's just such a misconception that you can not do it . '' A frost line means they 're common in the winter . Alternatives , like safe rooms , exist .
They abound over basements , builders say . ` ` We do 'em all day long , '' says one who has built many in the Oklahoma City area . A frost line means they 're common in the winter . Alternatives , like safe rooms , exist .