Drilling holes in deck support posts


  #1  
Old 05-27-24, 06:59 AM
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Drilling holes in deck support posts

My deck builder drilled holes in all 5 the front deck support posts in order to run electrical wiring for lights to be mounted on the front of the posts. Holes were drilled near the top and also about 1/3 of the way down connected by a notched out section to run the wiring. He reassured me that this would not compromise the integrity of the structure. When I asked him “are you sure?” his reply was “very sure.” That work was done about 3 months ago. The posts are now covered in paintable Azek panels and the deck is near completion (railing and underdecking not yet completed). I have been thinking about these holes some more and I’m not at all convinced that my deck is safe with these holes having been drilled. (I added photos to this post, but not sure if they are visible)
Thoughts?




 

Last edited by brentba; 05-27-24 at 07:27 AM.
  #2  
Old 05-28-24, 05:04 AM
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I am not a structural engineer but I do not see a problem.

Go into any house that has a basement and you will see many electrical lines running through the floor joists.
 
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Old 05-29-24, 08:42 AM
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Pretty hefty sized holes looks like. I agree with manden, especially since these are vertical members and not horizontal.

If those are 4x4's the cross section area would be just over 12 square inches, the hole is less than 1 square inch or less than 10% of the area involved.

We'll see if any of the construction gurus chime in to differ.
 
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Old 05-29-24, 02:44 PM
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Structurally they should be OK. If the wiring is low voltage--OK. If the wiring is 120 volts then the channels should have metal protection to prevent screwing or nailing through the cable.
 
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Old 05-29-24, 02:44 PM
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Thanks for the replies. The vertical support posts are all 6x6's.
 
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Old 05-30-24, 04:49 AM
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Yikes, even beefier than I thought; hard to tell size from photo.
 
 

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