What kind of bird did you lose? I have a covered run (corrugated metal about 10' high at the peak) so there's plenty of shade but even with shade it doesn't do a whole lotta good when it gets to 115 F and higher. I'm kinda glad the hottest day is supposed to be Sunday so I'll be home and can watch them closely. I'm figuring on changing their "standing in" water about every 3 hours or so and maybe adding some ice. They'll be on their own Monday though but it's supposed to drop a few degrees then.
The one I lost was a Black Australorp hen. I have the Black, Blue, and Splash Australorps.