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RE 10 10th Street - Cloisters Unit 52 - Renovation Questions (2)Good morning sir, Thank you for the response. Yes, they pulled up some of the cracked portions and I brought samples back to the office. They had a lightweight bottom layer w/ a normal weight topping in some areas. I got with a local architect we work with… he says the only current UL assembly he could find that was wood framed floor w/ 1-5/8” perlite-sand (lightweight) concrete was UL516 and was not sure what the actual assembly would’ve been back then when they originally installed it. I have attached the assembly from Georgia-Pacific that he sent over. I will be checking all the current members to verify they have the capacity for the assembly but it will definitely be less weight than what was there. Thank you, Adam Russell, P.E. VP of Engineering E: arussell@russrow.com <mailto:arussell@russrow.com> O: 904-503-3283 C: 850-556-8072 W: russrow.com <http://russrow.com/> 13241 Bartram Park Blvd #813, Jacksonville FL 32258 Follow us on social media <https://www.linkedin.com/company/russellrowlandinc> <https://www.facebook.com/russellrowlandinc/> <https://www.instagram.com/russellrowlandinc> From: Arlington, Daniel <darlington@coab.us> Sent: Thursday, March 5, 2020 6:08 PM To: Adam Russell <arussell@russrow.com> Subject: RE: 10 10th Street - Cloisters Unit 52 - Renovation Questions Adam, I would like to see an approved floor/ceiling assembly, fire-rated for 1-hour, come in with the permit application. You have to be comfortable with the weight. The existing lightweight concrete doesn’t seem that lightweight. Has anyone tried to get a rough estimate of a cubic foot of that? We can’t control the existing construction (especially the ceiling, below), but if you find a poured product that is part of a 1-hour rated wood floor/ceiling assembly and you are comfortable with the weight, I will probably approve it. Regards, Dan Arlington Dan Arlington, CBO Building Official City of Atlantic Beach, Florida darlington@coab.us <mailto:darlington@coab.us> (904) 247-5813 From: Adam Russell [mailto:arussell@russrow.com] Sent: Thursday, March 5, 2020 8:29 AM To: Arlington, Daniel <darlington@coab.us <mailto:darlington@coab.us> > Subject: 10 10th Street - Cloisters Unit 52 - Renovation Questions Good morning sir, I am working w/ Ranier, Inc. on a renovation to this model… and due to major cracks in the existing light-weight concrete cover on the floor (which we also assume served as the fire separation) they are completely re-doing the floor. They are trying to determine what hour rating the new floor system needs to be at. I would assume we could go back with the same material and it would be just like the original…. But I wanted to get your thoughts prior to suggesting. I believe a typical 1-5/8” lightweight (perlite concrete) topping is a typical 1hr assembly but that’s not my expertise…. Typically an architect provides this info. Due to it being a replacement of existing, I think going back w/ that should suffice but ultimately I am just verifying all of the structure is good for this and the few changes they want to make. Thank you, Adam Russell, P.E. VP of Engineering E: arussell@russrow.com <mailto:arussell@russrow.com> O: 904-503-3283 C: 850-556-8072 W: russrow.com <http://russrow.com/> 13241 Bartram Park Blvd #813, Jacksonville FL 32258 Follow us on social media <https://www.linkedin.com/company/russellrowlandinc> <https://www.facebook.com/russellrowlandinc/> <https://www.instagram.com/russellrowlandinc>