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Home remodel question?

Old 10-22-2014, 11:46 AM
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I'm having a new 3/4" natural gas line run across the crawl space. The main obstacle is a double 2x12 girder sitting on pilings, that spans the entire area. Drill the girder, or drop under?
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Old 10-22-2014, 11:50 AM
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Drop under, go around, four elbows and some small pieces and done... drilling through it could cause long term sagging issues with a hole that size imo...
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Old 10-22-2014, 11:52 AM
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Yep. Lve the wood alone. Over, under, around whatever.
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Old 10-22-2014, 12:22 PM
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Make your run where the pipe will pass through the girder at the center of a piling point. We're only talking about a 1 1/4 in. hole and it surely ain't going to really weaken anything on top of a piling and it will make the job neater, quicker, and cleaner in the end.
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Old 10-22-2014, 01:01 PM
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https://engineering.purdue.edu/~jliu..._Guide_A11.pdf

Drill away! See the attached link.
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Old 10-22-2014, 01:17 PM
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Just drill through the center. You will not weaken the integrity of the wood by drilling a hole in the middle. It is done everyday on stilt homes. A lot of the prefab truss systems are pre drilled in the middle for plumbing and gas lines.
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Old 10-22-2014, 01:43 PM
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I would go through.
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Old 10-22-2014, 01:47 PM
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Originally Posted by hevysrf View Post
I'm having a new 3/4" natural gas line run across the crawl space. The main obstacle is a double 2x12 girder sitting on pilings, that spans the entire area. Drill the girder, or drop under?
Why 3/4 and not 1 in. to the first major fixture then reduce (furnace)?
Unless this is for a grill or such

Last edited by Thalasso; 10-22-2014 at 02:12 PM.
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Old 10-22-2014, 01:53 PM
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I would go under....black pipe makes a great chin up bar or rod to hang stuff on, such as lights, power tools, etc.
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Old 10-22-2014, 02:03 PM
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Originally Posted by Thalasso View Post
Why 3/4 and not 1 inch to the first major fixture then reduce (furnace)?
Thanks for replies, it is a tee after furnace, dryer, before stove, 21k input gas fireplace, 3/4 is over kill, crawlspace is only 31" clear height so chin up bar does not apply. Most convenient spot is near center of span so it looks like a go under.
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Old 10-22-2014, 02:05 PM
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It says "notching not permitted in center 1/3" nothing about a 1" hole.
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Old 10-22-2014, 02:10 PM
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Drill above a column as small of a hole as possible in the middle 1/3.
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Old 10-22-2014, 02:12 PM
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On a double 2x12 I wouldn't even think twice about drilling a 3/4" hole through it. Would be more concerned about all those elbows to get around it! Do it.
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Old 10-22-2014, 02:48 PM
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Is it black iron or corrugated stainless??
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Old 10-22-2014, 03:17 PM
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You don't want to drill over a piling or under a wall or column as the joist is loaded in compression. What you want to do is drill thru the center of the joist in the "neutral axis". The wood above the hole is I compression and below the hole in tension. Under would work too, lol.
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