I have a 100 year old city rowhouse and thinking to finish the basement. I have cleared all the dangling electric cables and rerouted the water lines the attached to the ceiling beams. All I have left on the basement ceiling is the gas line that runs perpendicular to the basement ceiling beams. It is held with hangers against the beam but I was thinking to cut 1.5" notches on the bottom of the beams and fit the gas lines in. The beams are a true 3"x8" and the notches would one side not in the middle. If it one beam, I would think it is ok being 1.5" is less than 1/3 the size of the beam, but does cutting this notch on all the beams change things? I am not sure I want to run CSST so I am looking to all options here. Also, concerned notching all the beams will compromise the structure. Any strong opinions against notching? I want to clear the basement ceiling to make it appear more spacious and possibly put a ceiling and I only have 78" height.
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Notch depth is 1/6 of joist depth, maximum. No notches at all in the center 1/3 of the joist.
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Holes, of 1/3 joist depth or less in diameter may be placed at least 2" from the edges. The center of the joist is the least impact, structurally.
I would strongly suggest getting over whatever objection you have to CSST. You're messing with the gas line at all, you might as well end up with it at a modern standard of installation; And you can put it through holes.
Ecnerwal
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