Brian in Florida asked:
I have a metal roof with no underlayment, just the bare metal and it is so loud. My question is: if I add 1/2 inch osb under it will it really help with the sound or do i need to add more like the roofing foil which looks like bubble wrap... thank you in advance
Typically, the sound proofing is done with insulation boards and or a specialized underlayment. Unless he wants to take the metal off and start over again. He would need to climb up in the atic and use a sound barrier there. Same as they use in sound studios. Which can get costly as well.