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Radiant Heating

hr
hr Member Posts: 6,106
in THE MAIN WALL
most manufactures have pocket guides to help you with drilling, nailing, etc.

I keep the TJI brand pocket guide on the dash of my truck.

I'd bet you could get the info online also. They REALLY want you to know how and where to drill. Field repairs can get complicated and expensive :)

hot rod

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Comments

  • Robinson Construction
    Robinson Construction Member Posts: 1


    Whats the preffered location for drilling the holes in engineered i-joists the spacing and the number of holes you can put in a row?
  • GMcD
    GMcD Member Posts: 477
    The Manufacturer of the Engineered Joist

    They should have a set of guidelines as to the size and location of any holes. Asking here will only get you "opinions". If you drill holes that are not properly located and sized, you WILL compromise the structural strength and stiffness of the joist.
  • brucewo1b
    brucewo1b Member Posts: 638
    Really need to find spec from

    company that made the beam and they do not go where you would normally think they would in regular built wood I beams. last one I checked on was something like in the top or bottom third no more than one third from each end.
  • [Deleted User]
    [Deleted User] Posts: 1,160
    What Geoff said...

    The manufacturers intentionally send drilling/boring instructions out on the joists to educate the contractors working with them.

    I can tell you this based on my experience, you handle them COMPLETELY different than dimensional lumber. With diemnsional lumber, you must be within three times the beam depth for your hole, and the maximum hole allowed is 1/3 of the parent material, and that must be the middle third. With Trus-Joist Inc I joists, you must be AT LEAST 3 times the beam depth away from a support structure before you are allowed to take out more than 1-1/4", and the further away from the support structure you get, the more material you are allowed to take out. Once in the center third of the span, you can literally take all the webbing out except for the 1/2" nearest the cord, and you NEVER want to TOUCH the cord with a saw blade, or all **** may break loose. Literally.

    Read and follow the manufacturers instructions.

    ME
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