Exterior light fixtures and recept. outlets

[Jeff Eastman]

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[Jerry Peck]

Light fixtures, yes.

Receptacle outlets (and switch) covers come with a gasket behind them to seal them to the wall.

Two reasons:

1) To keep water out of them. This would be part of their listing and labeling.

2) To keep air infiltration/exfiltration down to a minimum. This would be in the energy codes.