19 Jun 2019
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United Kingdom
I need to run central heating pipe horizontally under the floorboards of an upper floor. I need to go through only one 75mm wide beam, but I'm wary of boring or notching it, also because that would be quite close to the wall bearing the beam.

So I thought of running an 8mm or 10mm pipe immediately over the beam, by digging a ditch on the lower face of the 18mm floorboard resting on the beam, to accommodate the pipe.

I wanted to know if this makes sense, and how to prevent possible problems such as noises and pipe wear (on the long run). Also: plastic or copper pipe?

Last edited:
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Nope, don't attempt it. It would end up being too tight and the floor board would be compromised and flex more at at that point. You can notch the joist as close as 0.07 of the joist span to the load bearing point.
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