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As the CSA O86 no longer lists OSB Type 1 Sheathing, it has been removed as an input choice. If a file is opened from a previous version that contains OSB Type 1, then the material type of this wall is changed to construction OSB and the grades A,B or C are changed to 2R24, 1R24_2F16 and 2R32_2F16 respectively. If the thickness specified is outside of the range of the valid thicknesses for that marking type then the thickness is set to the smallest thickness for that marking type.