Re: Soundproofing a Heating Pipe (Noisy Neighbors)
You can insulate the pipe, and cover or fill the gap, without constraining the pipe's ability to expand and contract. Think of an overlap detail, where one piece is anchored to the floor and the other is attached to the pipe.
Most any thermal insulation material is going to do a decent job with noise. This stuff is phenomenal, just check the temperature limits before you put it in contact with a steam pipe. If it's not rated for 212F then you could use it as a jacket over fiberglass pipe insulation. Acoustiblok Soundproofing Material - Acoustiblok Website
Condo Townhouse Noise - Acoustiblok Website
But like you say, building a walled chase around the pipe, and insulating the cavity with rock wool, will be as soundproof as you can get.
Trod Harland, Pickle Expediter
Not everything that is faced can be changed, but nothing can be changed until it is faced. — James Baldwin
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