Interior window sill material

I closed off the framing in the double walls around my windows with OSB.  I’ll finish the sides and top surfaces with drywall, but I expect to need something tougher… I closed off the framing in the double walls around my windows with OSB.  I’ll finish the sides and top surfaces with drywall, but I expect to need something tougher…Read MoreGreenBuildingAdvisor