What do you put behind cast iron baseboard radiators?

howdiho

Hi, I am so glad to have found this site.



I am refinishing my basement and I have cast iron baseboard radiators (about 20 ft long) in one of the rooms that is a walk out. The wall that it will be against is concrete with studs in between.



So my 1st question is... what do I use to reflect the heat back into the room and where do I put it? I was told by one person to nail aluminum flashing BEHIND the drywall...but that doesn't seem right.



The 2nd question is...do I put insulation behind the radiator/drywall?



Thanks in advance for the advice, Matt