There are two distinct things to consider - the stick-on pads (Dynamat-style polymer sheets down to bitumen roof flashing) are just to stop panels resonating, but the key to blocking sound is to put mass, in the form of a barrier (like a mineral-impregnated vinyl sheet, lead or heavy rubber), between the source and your ears, leaving as few gaps as possible.
You should "float" the barrier sheet over a decoupling-layer of closed-cell foam to obtain the best benefits.
Philip
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