drilling through lam beam

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Old 03-19-06, 03:44 PM
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drilling through lam beam

I have a 5x19 lam beam that spans 20' to support the ceiling in my living room (20x26.) I'd like to add recessed lights and in-ceiling speakers, and to run the wire to the other side of the room I'd have to drill holes in the beam (floor above is finished.) Is this OK to do? I assume that small (3/4") holes would have no impact on the beam.

thx, Don
 
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Old 03-19-06, 05:32 PM
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Is this OK to do?
No, typically an engineer would need to be consulted.

I assume that small (3/4") holes would have no impact on the beam.
It could very well cause the beam to fail. Totally depends on how the beam is loaded, where you drill the holes, how many holes, etc etc etc...
 
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Old 03-20-06, 09:02 AM
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A 3/4" hole seems pretty big for your needs. 12 ga. romex will fit thru a 3/8" hole. Rather than one big hole I suggest two or three small holes as needed. You can drill them just about anywhere straight thru a glu-lam beam without a structural degradation. Avoid drilling thru the top or bottom lamination.
 
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Old 03-24-06, 07:14 PM
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for microlam beams deeper than 5.5", you are allowed to put a 2" hole in the middle third of the span, in the middle third of the depth no questions asked. you can have multiple holes provided you space them far enough apart.

a 3/4" hole is not a big deal. i wouldn't think twice about it, just stay in the middle third of the depth.

more info on holes and stuff is avalable from the TJI website

http://www.trusjoist.com/PDFFiles/2015.pdf
 
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