灰板就是sheetrock，一般室内墙都是用这个然后涂漆，
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green glue 是一种隔音胶
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这个方法原来的墙保留，再加一层墙皮，两层墙皮之间，涂成乱线一样的隔音胶，然后产生一些空隙，起到隔音效果，你可以youtube上搜下就明白了。做完了墙会比原来厚半寸左右。

效果想更好点的话，原来墙皮打开，塞隔音棉，然后外面这样再做一层，我家没搞这么麻烦，效果也还可以，我家门缝也很大，本来还打算想办法堵下，后来发现没必要了

费用也不贵，sheetrock本身很便宜，green glue 2-3百？看你多大的墙，边角处理麻烦不麻烦，找中国师傅手工应该也就几百左右，然后漆下，也不会很贵的（我用的师傅，起面新墙，也就收1000以内，地区不同应该费用会有些差异），整个下来1000应该可以搞定

楼上楼下可以用一样的方法处理。但是楼上楼下好多时候不光光是声音问题，更多是震动问题，这个就没啥好办法了。

mm别客气，节日快乐！