Interior moisture escaping through the exterior masonry walls.
Exterior moisture driven through masonry walls by wind and rain.
Basement walls that are not properly sealed against ground moisture penetration.
Insufficient curing time for new cement or mortar.
While some of the issues discussed above are caused by natural elements, it is often possible to prevent exterior paint problems by properly prepping the surface ahead of time. Before painting, be sure to check for the following problems and address them as needed: