Exterior Carpentry can be essential to a successful Completion of a paint project. It is essential that dry rot is removed as it is a fungus and moves into boards parrell, behind or next to the rotted surface.
Dry rot is caused from moisture being trapped in an area and not naturally evaporating creating a fungus that compromises and eats away ay the integrity of the wood surface. Caulking over or patching dry rot just makes to grow faster as fungus will cultivate even faster when locked into a warmer, moist area.
This condition is especially common for the northern exposures to a home and must be removed as soon as possible to avoid any structural damage.