I made an absolute fool of myself and drilled a 3/4" hole vertically through Laminated Veneer Lumber (LVL) when trying to run wires into an attic above an 30" wide exterior window. I realized my mistake after drilling through about ten (!) inches of material (not including the 2x4 the LVL sits on).

Here's a schematic of the exterior wall I'm working on:

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The window in orange text is where the LVL is located. The wall this window is located has brick veneer siding.

Here's a view from the attic - the top plate that is outlined is where the LVL is located. The hole (if I went all the way through) would be at the text near the top of the outline. To the left of the top plate, you may be able to see a bit of the tar paper that's behind the brick veneer.

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Here's an image of the exterior window in question:

enter image description here

I'm trying to determine what sort of load may be displaced due to drilling through the LVL. I intend on contacting a structural engineer for an assessment. At the very least, the roof won't collapse, but going almost entirely through a structural member is no good.

  • just for understanding can you spell the TLA
    – asinine
    Aug 30 at 3:08
  • @Ruskes Sorry, I don't follow. The TLA?
    – tripleblep
    Aug 30 at 3:15
  • 2
    Anybody trying to answer this question would know what an lvl is. Aug 30 at 3:30
  • 2
    TLA = Three Letter Acronym. Answerers might know but others trying to learn new things here might not.
    – Gal
    Aug 30 at 5:21
  • I think you are OK with just q 3/4" hole.
    – RMDman
    Aug 30 at 11:56


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