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Observation: Nails have stained siding.

Performance Standard: Stains extending more than 1/2 inch from the: nail and readily visible from a distance of more than 20 feet are unacceptable. This performance standard does not apply if “natural weathering” is specified for the job.

Corrective Measure: The remodeler can choose either to remove stains that do not meet the performance standard, or to paint (or stain) all the siding a color selected by the owner.

 Discussion: Stains may be from oxidation of nails or leaching of extractives from the wood. Use of galvanized nails (even double hot-dipped) will not necessarily prevent staining. Clear water-repellent sealer applied immediately after installation of siding will retard leaching and rusting.