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Rice Hulls--insulating

Posts: 325
Location: Victor, Montana; Zone 5b
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I couldn't find adequate information online elsewhere so I figured someone here could shed light on my questions.

Rice hulls seem an excellent insulation source, I'm looking at using them in the ceiling under both a living roof and a small connected cedar shake roof. The only bags of rice hulls I could find come in 50lbs at the cheapest $12 a bag plus shipping. They rate at around R-3 per inch so my questions are:

1) how many pounds of rice hulls do I need for a 500 square foot roof? They come in compressed 7 cubic foot bags, but I have no clue how far each bag would go at say a 10 inch layer (R-30).
2) anyone know where I can source them cheaper? It is an ag. waste product, you would think I could find it for a bit less.
3) has anyone actually used rice hulls? experiences? results? method?

Posts: 3446
Location: Kansas Zone 6a
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They are used as bedding in chicken or turkey cafos, so they are available in bulk semi loads.

But you are going to have a lot of freight to get them to Montana.  

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