Kevin James Landscape, Inc., guarantees our walks and patios to be installed in a professional manner, using current industry standard practices. Out walks and patios are guaranteed for life against settling and sinking, as long as the subgrade is left intact and not disturbed by boring or adding undue pressure to them, such as a car or construction equipment. All bricks and block will “leech” lime to the surface, this is the white “powder” that accumulates on the surface. This is a natural occurrence and will stop after a few months of natural, periodic rain. If sinking or settling occurs, we will correct the problem at no additional charge.