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.
ANSWER: The average life of a typical asphalt shingle roof is 20 years, according to Dean Morekas, home inspector with Boswell Building Surveys Inc. However, he cautioned that the life expectancy can be significantly reduced if attic ventilation is poor or if there are multiple layers of shingles.