Home / Repair checker / Where's the problem? Where's the problem? What's the problem? Where's the problem? Windows and doors Floors and ceilings Roof, loft, chimneys Walls Stairs and close Outside Stone, brick harling, and structural problems. Cracks in outer walls Bulging walls Stone decay Pointing - the mortar between stones Plant growth Brickwork flaking or powdery White powder on surface - efflorescence External brick and block walls Surface breaking off - damp and frost External brick and block walls