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Old 05-26-2008, 01:35 PM   #1
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Drilling through parallam


Hello...

I need to drill a 1/8" hole and a 1/2" hole through the parallam that divides my basement. It is a 5 1/2" x 16" beam with the main level I-joists connected to it with standard hangers. If the beam wasn't there, then the I-joists would be spanning roughly 26 feet. The I-joists are 11 1/2" tall. Some of the people that worked on the house thought the beam was overkill, but I don't know.

Can I drill these two holes through this beam without bringing down the house?

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Old 05-26-2008, 02:42 PM   #2
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Drilling through parallam


The chart that came with the beam will tell you.

Is there a name on it that you can look it up on the web?

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Old 05-26-2008, 03:07 PM   #3
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Drilling through parallam


The problem might not be bringing the house down, but having the holes noted in a future home inspection should you wish to sell. Some lam beams are not to be drilled at all. Better to check.
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Old 05-26-2008, 05:27 PM   #4
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Drilling through parallam


I asked for the drilling chart for a lam beam once and the GC looked at me like I had three heads!
He said just drill the damn hole.
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Old 05-26-2008, 08:54 PM   #5
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Drilling through parallam


Quote:
Originally Posted by Speedy Petey View Post
I asked for the drilling chart for a lam beam once and the GC looked at me like I had three heads!
He said just drill the damn hole.
And I had a GC who refused to allow me to drill one little hole and I had to go around the darn things in a sunken living room.
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Old 05-26-2008, 09:45 PM   #6
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Drilling through parallam


Yup, been there too.

There are charts that come with every beam like that, and wood I-beams as well, yet some GC's/contractors/folks forbid any drilling. Some of the holes you can put in an I-beam are huge, yet legal.
Go figure.

Check this .pdf down near the bottom:
http://www.anthonyforest.com/pdfs/AP...mber_Beams.pdf
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Old 05-26-2008, 09:54 PM   #7
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Drilling through parallam


Those are tiny holes. You can drill them with confidence. Most PSL and LVL manufacturers will allow some pretty big holes with no reduction in performance. Just don't drill right at the bearing point, and keep those holes as close to the center of the beam's depth as possible. A hole at the bottom edge, or close to it, is a bad thing.

Vertical holes through the beam are another story. Don't do that.
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Old 05-26-2008, 11:16 PM   #8
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Drilling through parallam


Thanks for the .pdf link, that is very helpful. The area that I will be drilling my holes is dead center length and height on the beam so I should be solid.

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Old 05-27-2008, 08:08 AM   #9
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Drilling through parallam


Great link Speedy. I will file that PDF away for future use.
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Old 05-27-2008, 09:11 AM   #10
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Drilling through parallam


That is a useful link, but it is not the product that the OP is drilling. The above link is for glulam, which is not the same as PSL or parallam.

See page 36 of the attached link for hole allowances in PSL...

http://www.ilevel.com/literature/TJ-9000.pdf
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Old 05-27-2008, 04:48 PM   #11
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Drilling through parallam


Now I'm all set. I have the drill ready to go for next time. Thanks.
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Old 05-27-2008, 06:47 PM   #12
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Hey even a better link. Thanks for that one too.
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Old 05-27-2008, 07:24 PM   #13
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Drilling through parallam


Now if I could get the HVAC contractors to pay attention to the drilling/notching requirements!
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Old 05-28-2008, 09:30 AM   #14
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Drilling through parallam


I had an HVAC guy snip my rough in romex in each stud space he wanted to use for his supply and return ducts. The resulting discussion got pretty heated. The homeowner was the general. I did get paid time and material for replacing those runs. Years later, I still can't believe he did that. I heard his boss fired him after that job.

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