On the other hand, any per-unit retain certificate (other than capital stock) which is redeemable only in the discretion of the cooperative association, or which is otherwise subject to conditions beyond the control of the patron, shall be considered not to have any fair market value at the time of its issue, unless it is clearly established to the contrary.
Composition roof lifeAsphalt shingles are rated at 20, 25, 30, or 35 years. The average roof life is 5 to 10 years less, depending on climate conditions in your area. The life of any asphalt shingle roof is effected if Algae and Mildew is allowed to grow on it.
The heavier the shingle, the longer the wearing surface lasts. If shingles are dark in color and lightweight(180 lbs) expect a life of 7 to 9 years. For a 400 pound fiberglass shingle, you can expect about 17 years. For weighs somewhere in the middle, expect a life of about 12 to 15 years.