(a) General rule. —Except as provided in subsection (b), a civil action or proceeding brought against any person lawfully performing or furnishing the design, planning, supervision or observation of construction, or construction of any improvement to real property must be commenced within 12 years after completion of construction of such improvement to recover damages for:
(1)Any deficiency in the design, planning, supervision or observation of construction or construction of the improvement.
(2)Injury to property, real or personal, arising out of any such deficiency.
(3)Injury to the person or for wrongful death arising out of any such deficiency.
(4)Contribution or indemnity for damages sustained on account of any injury mentioned in paragraph (2) or (3).
(b) Exceptions.
(1)If an injury or wrongful death shall occur more than ten and within 12 years after completion of the improvement a civil action or proceeding within the scope of subsection (a) may be commenced within the time otherwise...