Do you put OSB sheathing over tar paper?

No, OSB (Oriented Strand Board) sheathing is typically installed directly onto the framing of a structure, rather than over tar paper. The tar paper, or roofing felt, is usually applied on top of the sheathing as a moisture barrier before installing roofing materials. This helps protect the sheathing from water infiltration. Always consult local building codes and best practices for specific installation guidelines.