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Steel nails that have rusted allow the slate to slide or tilt. Unchecked flashing leaks from deteriorated copper or rusted tin can cause deck and/or structural deterioration. Photos of the deck deterioration behind steeple finials are shown below.
This deteriorated deck was the direct result of the tin flashing rusting through. Because the steeple was not inspected on a periodic basis this condition was allowed to exist for many years. It was only when moisture appeared in the form of a small ceiling stain did anyone consider having the steeple inspected at which time the structural damage had already occurred.
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