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We have a multi-family project where we have been requested to strongly consider using a Magnesium Oxide Board (MGO) product for floor and wall sheathing as well as finishes for ceilings and walls in lieu of standard and UL fire rated gypsum products.
We've found both a UL 2-hour wood framed wall and 1-hour wood truss floor/ceiling assembly using MGO but no UL tested and approved assemblies that would be applicable for use in Type 3 wood framed construction requiring non-combustible materials.
· What experience do you have or what have you learned concerning MGO sheathing and sheet products and would you consider using the material in wood framed multi-family projects?
· Is Magnesium Oxide Board (MGO) an acceptable alternative product substitution for:
· Market rate sheathing products & assemblies like zip wall & OSB/plywood, Dens-deck.
· Interior gypsum board, non-load bearing-Interior.
· Floor/Roof deck material in lieu of plywood floor deck.
· With MGO being made with chloride & non-chloride mixes would you recommend non-chloride as an acceptable product? And why?
§ If the answer is yes, how does a firm evaluate the substitution with MGO not being that prevalent or time-tested as other products here in the US market for multifamily & commercial projects?
· Are you aware of any insurance related rulings/judgements concerning acceptance of MGO usage within jurisdictions that have warm humid climates such as Florida?
We appreciate any help and insights you can share with us on the above topics.
Happy Holidays to all!
Larry H. Adams, Jr. AIA
955 North Pennsylvania Avenue
Winter Park, FL 32789 USA
w 407 . 740 . 8405