Cripple Walls

Are wood structural panels required on the inside of cripple walls of a 33 year old home with 2x6 vertical studs if there is already wood sidiing over plywood sheathing on the exterior of the wall?

What if it only had 2x4 vertical studs?


Cripple walls do not require a wall covering on the inside, as long as there is no insulation installed with the vapor retarder exposed. Then a wall covering wiil be needed to cover the combustible vapor retarder.