Surface Mount or Flush Mount Ext Box?
I am re-shingling my house and want to install 2 new exterior outlets. I am also insulating an installing new interior walls so I have easy access to the inside of the sheathing. My first concern is water infiltration over the long term. Between a properly installed surface or flush mount box, which will be most likely to keep water away from the sheathing?
Re: Surface Mount or Flush Mount Ext Box?
Properly gasketed & caulked, neither method is more prone to leaks than the other.
I never install surface-mounted boxes unless I have to (such as on an existing masonry wall. The surface-mount box, combined with a Weatherproof cover that allows the cover to be closed with a plug inserted, sticks out 5-6 inches and is a real eyesore. It is also more likely (than a shallower box) to get knocked into and damaged.
Just my opinion.