New deck boards and railings: Depreciation or Repair?

[Silvia B.]

This Summer we personally replaced the deck boards and railings on one of the decks. The structure ( posts, joists, etc) were ok but the old deck boards were bad and it was time to replace them. It cost us about $1500 in supplies, no labor costs as we did it ourselves. Would this be considered a repair/supplies deduction or should it be depreciated? If depreciated, how many years?