Exterior Concrete Topping

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Author Message Jerome J. Lazar, CCS, CSI Senior Member Username: lazarcitec Post Number: 2021 Registered: 05-2003 Posted on Monday, June 17, 2019 - 02:25 pm:    Working on a wood frame 4 story multifamily (not my wheelhouse) stair landings call for exterior conc topping over waterproof membrane over T&G OSB, I am confused on what topping product to specify, must be fire rated? Phil Babinec Senior Member Username: pbabinec Post Number: 23 Registered: 09-2004 Posted on Friday, June 28, 2019 - 10:48 am:    Similar design on same type of project, I used a normal weight concrete topping with small aggregate. I do not recall thickness of detail. Perimeter edge restrained with a Simply Products Co." Concrete T-Bar with drip edge.