Once upon a time, when Span Crete was a precast plank of choice in the markets we served, we used “mollies” i.e. butterfly nuts that we pushed into the cores. Worked like a charm and you could double nut from below and/or deadhead the rod against the underside of the interior cell, which made it more stable for loading pipe into the rings.
I have no idea if this is considered an acceptable practice now, Steve L. From: Bob Knight <[email protected]> Sent: Thursday, May 01, 2025 9:09 AM To: [email protected] Subject: [Sprinklerforum] Concrete Hollow Core Hanger I have a project with concrete hollow core panels. It is a cold room with a dry system. The mains are 6". Does anyone have suggestions on which concrete insert or screw that will work for these? -- Thank you, Bob Knight, CET III Fire by Knight, LLC 208-318-3057 [FIREBYKNIGHT] [https://s-install.avcdn.net/ipm/preview/icons/icon-envelope-tick-green-avg-v1.png]<https://url.avanan.click/v2/r01/___http:/www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient___.YXAzOnByb3RlY3Rpb25kZXNpZ25hbmRjb25zdWx0aW5nOmE6bzo1ZDg5YWVkZDcxNjljZWI2NTNjNGJmZThmMzQ1OTljMjo3OjU4Yzk6Y2ZiMTlhNzRmMWEwMzc5ZDc1NGVkMWFlYzUzZDMwY2EyYjU1YzYwZDQwYmJhMGViZTc5ZTlmZDhkYTAwMGE2ZjpoOlQ6Rg> Virus-free.www.avg.com<https://url.avanan.click/v2/r01/___http:/www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient___.YXAzOnByb3RlY3Rpb25kZXNpZ25hbmRjb25zdWx0aW5nOmE6bzo1ZDg5YWVkZDcxNjljZWI2NTNjNGJmZThmMzQ1OTljMjo3OmZmNDc6YWMzOGM4Y2NmNzAzODQxOWI0ZTI0NTQzMjZlNTY0ZjA4YzJlOTA5NmViOWIyNGY4YTcwY2QxNGQwMzI5ZGRjZDpoOlQ6Rg>
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