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Do-It-Yourself (DIY) Question & Answer Forum
Drilling through Eco joists
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<blockquote data-quote="Mark2spark" data-source="post: 512632" data-attributes="member: 220"><p>Thanks for the answers Guys.</p><p></p><p>Flat bits are the only things that work, even they're a bit naff. It's the thread thing that pro dave mentions that's the issue. Not enough 'meat' in the carboard/hardboard centre part.</p><p></p><p>Auger bits tend to 'bite' and try and spin you off your steps <img class="smilie smilie--emoji" loading="lazy" alt="😱" title="Face screaming in fear :scream:" src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f631.png" data-shortname=":scream:" /></p><p></p><p>Yes I know all about drilling zones, thanks for the re-education though.</p><p></p><p>FYI, we've actually had a tool box talk with the joist manufacturer on site, and he said that you can drill any hole less than 25mm, anywhere you like. Zones are out of the window to a certain extent. The one that surprises me the most is being able to drill a 125mm hole to take a soil/duct pipe (100mm nominal) through these joists.</p><p></p><p>Yes, you can't (not supposed to anyway) drill through the solid upper and lower timber sections.</p></blockquote><p></p>
[QUOTE="Mark2spark, post: 512632, member: 220"] Thanks for the answers Guys. Flat bits are the only things that work, even they're a bit naff. It's the thread thing that pro dave mentions that's the issue. Not enough 'meat' in the carboard/hardboard centre part. Auger bits tend to 'bite' and try and spin you off your steps 😱 Yes I know all about drilling zones, thanks for the re-education though. FYI, we've actually had a tool box talk with the joist manufacturer on site, and he said that you can drill any hole less than 25mm, anywhere you like. Zones are out of the window to a certain extent. The one that surprises me the most is being able to drill a 125mm hole to take a soil/duct pipe (100mm nominal) through these joists. Yes, you can't (not supposed to anyway) drill through the solid upper and lower timber sections. [/QUOTE]
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Drilling through Eco joists
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