Installing Drywall Over Wood Lath
Tom Silva gives advice on whether to keep wood lathe when repairing a ceiling
After gutting the horsehair plaster, our contractor removed the wood lath on the exterior walls in order to insulate them. Should the lath also be removed from the ceiling before installing drywall? — Tim Bruce, Riverside, R.I.
Just leave it.
Lath actually stiffens the joists a bit, and there's no reason to add more debris to the landfill. As long as the drywall is fastened to the joists—not the lath—using screws that are ¼ inch longer than the ones for the walls, your new ceiling will be fine.
— This Old House general contractor Tom Silva