I'm installing low-profile (slim) recessed LED IC-rated lights in my living room that has a drop ceiling. Above the area that one of the lights will go is a plastic sheet seemingly filled with old lathe and plaster (no idea why). I can't tell how much garbage is actually up there so would rather just leave the plastic alone.
Is there any problem with pushing the recessed lights into the hole right up against the plastic sheet? I know IC-rated means that it can come in contact with insulation - what I'm not sure about is how IC-rated fixtures differ across other materials.