# Drilling holes in floor joist? **URL:** \ **Category:** Public Archive\ **Created:** [May 2, 2004, 12:00am UTC](https://forum.nachi.org/t/drilling-holes-in-floor-joist/175227 "2004-05-02T00:00:00Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![system](https://global.discourse-cdn.com/internachi/original/3X/d/f/df7ced6a9ca05e7c93fa949dfc12a8c10d06c887.png) [@system](https://forum.nachi.org/u/system)\ **Post date:** [May 2, 2004, 12:00am UTC](https://forum.nachi.org/t/drilling-holes-in-floor-joist/175227/1 "2004-05-02T00:00:00Z")
**Originally Posted By: David Brown** **This post was automatically imported from our archived forum.** * * * Hello everyone,Im new to the bb,and the home inspection industury.I hope to become a member next week.Im still studying to become a home inspector.I was watching a tv show ,and they were installing radiant heat in a house that was under constrction.I noticed that they had drilled holes in most of the floor joist,to run the plastic piping.Im not sure what size the floor joist were,but I thought that would weaken the floor.Am I right,or wrong on this? * * * ---
**Author:** ![system](https://global.discourse-cdn.com/internachi/original/3X/d/f/df7ced6a9ca05e7c93fa949dfc12a8c10d06c887.png) [@system](https://forum.nachi.org/u/system)\ **Post date:** [May 2, 2004, 12:00am UTC](https://forum.nachi.org/t/drilling-holes-in-floor-joist/175227/2 "2004-05-02T00:00:00Z")
**Originally Posted By: gbeaumont** **This post was automatically imported from our archived forum.** * * * Hi David, yes you are quite correct about, drilling and notching weakening joists, in fact where, and by how much joists can be drilled is regulated, I don't know where you are located, as there are slightly different regulations in place in Canada, but here is a diagram that may help you. ![](upload://pkuOUtpFflclosGnvJn0bXUcctT.gif) you can check out the rest of this series at: [http://www.nachi.org/toc-tips.htm](http://www.nachi.org/toc-tips.htm) Regards Gerry * * * -- Gerry Beaumont NACHI Education Committee e-mail : [education@nachi.org](mailto:education@nachi.org) NACHI phone 484-429-5466 Inspection Depot Education [gbeaumont@inspectiondepot.com](mailto:gbeaumont@inspectiondepot.com) "Education is a journey, not a destination" ---
**Author:** ![system](https://global.discourse-cdn.com/internachi/original/3X/d/f/df7ced6a9ca05e7c93fa949dfc12a8c10d06c887.png) [@system](https://forum.nachi.org/u/system)\ **Post date:** [May 2, 2004, 12:00am UTC](https://forum.nachi.org/t/drilling-holes-in-floor-joist/175227/3 "2004-05-02T00:00:00Z")
**Originally Posted By: rmoore** **This post was automatically imported from our archived forum.** * * * LOL Gerry… There I was typing out the info and you go and cheat by posting a diagram. * * * -- Richard Moore Rest Assured Inspection Services Seattle, WA [www.rainspect.com](http://www.rainspect.com) ---
**Author:** ![system](https://global.discourse-cdn.com/internachi/original/3X/d/f/df7ced6a9ca05e7c93fa949dfc12a8c10d06c887.png) [@system](https://forum.nachi.org/u/system)\ **Post date:** [May 2, 2004, 12:00am UTC](https://forum.nachi.org/t/drilling-holes-in-floor-joist/175227/4 "2004-05-02T00:00:00Z")
**Originally Posted By: gbeaumont** **This post was automatically imported from our archived forum.** * * * Hi Richard, it's the old saying, "a picture is worth a thousand words"............. and also a lot quicker ![icon\_lol.gif](upload://zEgbBCXRskkCTwEux7Bi20ZySza.gif) ![icon\_lol.gif](upload://zEgbBCXRskkCTwEux7Bi20ZySza.gif) ![icon\_lol.gif](upload://zEgbBCXRskkCTwEux7Bi20ZySza.gif) ![icon\_lol.gif](upload://zEgbBCXRskkCTwEux7Bi20ZySza.gif) Regards Gerry * * * -- Gerry Beaumont NACHI Education Committee e-mail : [education@nachi.org](mailto:education@nachi.org) NACHI phone 484-429-5466 Inspection Depot Education [gbeaumont@inspectiondepot.com](mailto:gbeaumont@inspectiondepot.com) "Education is a journey, not a destination" ---
**Author:** ![system](https://global.discourse-cdn.com/internachi/original/3X/d/f/df7ced6a9ca05e7c93fa949dfc12a8c10d06c887.png) [@system](https://forum.nachi.org/u/system)\ **Post date:** [May 2, 2004, 12:00am UTC](https://forum.nachi.org/t/drilling-holes-in-floor-joist/175227/5 "2004-05-02T00:00:00Z")
**Originally Posted By: jpope** **This post was automatically imported from our archived forum.** * * * If it is new construction, it’s likely that they were using this type of system. “Hole friendly.” ![icon_lol.gif](https://global.discourse-cdn.com/internachi/original/3X/f/9/f9d92d0317184e74bf4af4a8b30106d80406969c.gif) * * * -- Jeff Pope JPI Home Inspection Service "At JPI, we'll help you look better" (661) 212-0738 ---
**Author:** ![system](https://global.discourse-cdn.com/internachi/original/3X/d/f/df7ced6a9ca05e7c93fa949dfc12a8c10d06c887.png) [@system](https://forum.nachi.org/u/system)\ **Post date:** [May 2, 2004, 12:00am UTC](https://forum.nachi.org/t/drilling-holes-in-floor-joist/175227/6 "2004-05-02T00:00:00Z")
**Originally Posted By: roconnor** **This post was automatically imported from our archived forum.** * * * * * * – Robert O’Connor, PE Eagle Engineering ? Eagle Eye Inspections ? NACHI Education Committee I am absolutely amazed sometimes by how much thought goes into doing things wrong ---
**Author:** ![system](https://global.discourse-cdn.com/internachi/original/3X/d/f/df7ced6a9ca05e7c93fa949dfc12a8c10d06c887.png) [@system](https://forum.nachi.org/u/system)\ **Post date:** [May 2, 2004, 12:00am UTC](https://forum.nachi.org/t/drilling-holes-in-floor-joist/175227/7 "2004-05-02T00:00:00Z")
**Originally Posted By: David Brown** **This post was automatically imported from our archived forum.** * * * Thanks everyone for the info.Looks like I have some more studying to do!lol * * * ---
**Author:** ![system](https://global.discourse-cdn.com/internachi/original/3X/d/f/df7ced6a9ca05e7c93fa949dfc12a8c10d06c887.png) [@system](https://forum.nachi.org/u/system)\ **Post date:** [June 8, 2004, 12:00am UTC](https://forum.nachi.org/t/drilling-holes-in-floor-joist/175227/8 "2004-06-08T00:00:00Z")
**Originally Posted By: Guest** **This post was automatically imported from our archived forum.** * * * What if you’d like to drill a hole in the joist going along the length of the cement foundation? Dryer vents for example. Is this ever allowed? * * * ---
**Author:** ![system](https://global.discourse-cdn.com/internachi/original/3X/d/f/df7ced6a9ca05e7c93fa949dfc12a8c10d06c887.png) [@system](https://forum.nachi.org/u/system)\ **Post date:** [June 11, 2004, 12:00am UTC](https://forum.nachi.org/t/drilling-holes-in-floor-joist/175227/9 "2004-06-11T00:00:00Z")
**Originally Posted By: roconnor** **This post was automatically imported from our archived forum.** * * * The same rules apply … that is sometimes (my preference) called a “Rim Joist”. * * * – Robert O’Connor, PE Eagle Engineering ? Eagle Eye Inspections ? NACHI Education Committee I am absolutely amazed sometimes by how much thought goes into doing things wrong