I don't know if it is really illegal, but I feel bad for the guys that stay out on the floor all day. I at least get to come back to my lovely air conditioned office. I do know that we don't allow the guys to work for more than 30 minutes at a time without taking a 10 minute cool down break. And we provide ice, filtered water, gatorade, and drink bottles. Still, we have already had 2 pass out from heat exhaustion this summer...Crazy.