UL Assembly for 2x6 at 24" oc ?

[IsaArch]

All,

Thank you in advance and hoping you can help.
R-2 Apartment Building under IBC - with load bearing 2x6 exterior wall, exterior sheathing, rigid insulation and vinyl siding. Exempt from NFPA 285 as type 5 construction.

Structural engineer would like exterior wall to be 24" o.c. since floor joists and roof trusses are at 24" o.c. as well but I cannot find any tested assemblies that would allow 24" oc!! Everything I see calls for 16" o.c. examples U356 and V302....

Thank you!!!!

 

[Penguin87]

Ahem

The Wood Book™ | National Gypsum® Company

The Wood Book™ is your comprehensive construction guide for fire-rated assemblies in wood-frame construction.

www.nationalgypsum.com

See detail WS 104, UL U309

You really should download both the wood book, the purple book, and the USG Fire-Resistant Assemblies. They have all the fire rating information you will ever need for common construction methods.

The Purple Book II | Commercial Construction Details

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https://www.usg.com/content/dam/USG_Marketing_Communications/united_states/product_promotional_materials/finished_assets/usg-fire-resistant-assemblies-catalog-en-SA100.pdf

Also this: https://iq.ulprospector.com/en/_?tt...um+Board,+Lath+and/or+Plaster~10137:1|2|32|o2