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Originally Posted by cw4u  I've seen some theater spaces use a type of heavy stage curtain hung along the side and back walls of a building to (I'd assume) help with the acoustics of the space. |
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Originally Posted by cw4u How effective would this be? |
I think that neatly sums it up, how did it "help" the acoustics of those spaces and how does that relate to being effective for you? You need to address what you are trying to do in order to assess how effective something is at doing it. This is a common problem with acoustics, many people (including some who claim to offer acoustical consulting and/or contracting) approach it as simply being a matter of adding 'soft stuff' and not as trying to address specific problems or achieve a desired result. In some cases simply doing whatever you can is beneficial, but does not mean it is effective at addressing every problem or even necessarily some of the more significant problems.
I would also find out why the schools are replacing their curtains. Factors such as flame spread and smoke ratings typically require such materials to be specially treated, a treatment that may have to be renewed periodically. If this is one of the factors involved in the curtains being replaced then that is something you would also want to consider.