Patent ID: 7814714

Claim:
In combination, a first and second quantity of granular material and a granular material storage system, the granular material storage system comprising: a) a first granular material storage capacity for receiving the first quantity of granular material, said first granular material storage capacity comprising a wall volume and a repose volume of the first quantity of granular material, said wall volume defined by a wall structure; b) a roof structure comprising a plurality of spaced roof trusses supported by said wall structure, each of said roof trusses having a bottom cord; and c) a curtain having top and bottom ends operably secured to said bottom cord of said roof trusses above said wall structure such that said curtain is substantially parallel with said bottom cord of said roof trusses, said curtain defining a second granular material storage capacity for receiving the second quantity of granular material above said first granular material storage capacity.