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[Jamin Lynch]

I chose my words carefully. I said transfer of risk, not that it would fail.

Unfortunately I did leave a word out by accident lol

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Better call a structural engineer to see if those red iron beams will carry the load from the lighting fixtures. 

[Brian_Henry]

Better call a structural engineer to see if those red iron beams will carry the load from the lighting fixtures. 

Well now that you mention it...


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[duane massey]

Used to drill holes (many years ago) until the liability issue was pointed out. My only issue with beam clamps (and a minor one) came from seeing a plumber over-torque one and break it in half. However, considering some of the many far worse practices I have seen in THIS area, beam clamps are my first choice, with safety cables.
HOWEVER, I have seen several installs where the safety cable was attached TO the beam clamp.......

[Jamin Lynch]

If you're scared to drill a hole, at least use one of these.

[John Fruits]

There are also the rated purlin clamps.
http://www.thelightsource.com/products/112/view

[James Feenstra]

What could possibly go wrong? 

Drill and bolt in place for me. Might be harder but it's safer

why would you drill anything to use this style of beam clamp? they are not designed to be attached through holes

[Steve Kosiba]

These type of beam clamps, when the proper clamp is used for the proper beam and load limits are adhered to, are perfectly fine for permanently mounting static fixtures (ellipsoidals/PARs/&c).  For moving lights, however, I'd want a more proper clamp that grabs both sides of the beam.  As always make sure to use safety cables, and in this case wrap it around the entire beam.  Sometimes this means getting longer safety cables.

[Dave Garoutte]

Drilling a hole probably won't cause problems from the weight of the fixture, but when there is a ton of wet snow on the roof, that stress riser could be fatal.

[Stephen Swaffer]

There are also the rated purlin clamps.
http://www.thelightsource.com/products/112/view

The last time I asked for an engineer's opinion on loads from a purlin, the drawing I was given only allowed loads to be attached to purlins via an angle bracket tek screwed to the vertical portion of the purlin- nothing was to be attached to the horizontal flange.

Honestly, I think that was purely to shift liability, as I don't know that I've seen an install done that way.

[Brian_Henry]

Purlins are different from the I beams pictured above. Z purlins for example are rarely rated for loads above and beyond the live+dead roof loads. Also z purlins will easily deform under additional point loads. This doesn't mean they won't support a few fixtures but there is more than insignificant risk when dealing with some purlins.


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