I just go with the Uniform Fire Code. But I last looked it up in some SAAMI literature almost 20 years ago. Anyone know if the shift to IBC (from UBC) has been paralleled by a shift to an Internaitonal Fire Code, too? By state, county and city, you may be on different "standards", then you may also have local law amendments.
Step 1: Call you building department & find out which code you're on.
In general, I remember that up to 20 lbs of smokeless (5 lbs max Black?) in 1-lb containers are okay, then you need to have a vented fire-resistant cabinet. 1 inch of wood was okay per 1980s UFC.
It required a bigger & more fire-resistant but still vented cabinet at 20.001 to 100 lbs of smokeless, then started getting complicated above that. Separate storage units, minimum spacing distances, etc.
I just keep it below 20 lbs. Never bothered to check what effect the 2-lb, 4-lb and 8-lb containers had on the rules. Just keep 'em in original packaging.
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