I have sound insulated my wooden floor using MuteMat 3 and the flanking strip that comes with it. However my contractor left a part which is not part of the wall (therefore there is no skirting board) that touches the wardrobe without the strip, and I realized the other day that there is light coming from the bottom floor's ceiling. My guess is that (airborne) sound escapes from there too. He suggested to use self expansion foam to cover the gap, and that he couldn't put the strip as there is no skirting to fit on top. I am not sure on the self expansion foam, first I don't think it can replace the sound proofing strip, and second I am afraid that it will push the rest of the floor up in that area.
Any suggestions how to tackle this? My main worry is that sound might be escaping from there to the floor below.
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