of the first and second portions 44 46 have a predetermined length of approximately 44 inches similarly while the dimensions of the angled section 32 may vary to suit individual applications the two outside planar surfaces 50 54 of the preferred angled section have a base length of approximately 30 inches the center planar surface 52 has a base length of approximately 53 inches as illustrated in fig5 there is a shared boundary between the vertical section 30 and the two outside planar surfaces 50 54 as such the length of each of those planar surfaces 50 54 will preferably correspond to that of each of the first and second portions 44 46 of the vertical section 30 which in the preferred embodiment is approximately 44 inches also because the vertical section 30 and the angled section 32 are preferably unitary and constructed from a single sheet of composite material the thickness is typically uniform throughout both the vertical section and the angled section the generally planar unit 28 illustrated in fig6 is dimensioned and configured to abut the planar wall surfaces 14 included in the structure of a building and its foundation the planar unit 28 preferably includes a unitary diverter body generally shaped to fit closely to the planar wall surfaces 14 of the building foundation 12 however as with both the inside and outside corner units 24 26 alternative embodiments of the planar unit 28 may include multiple sub units that are subsequently assembled into a preformed unit therefore the generally vertical section 30 of the planar unit 28 is generally planar and has.