1331.05 FOUNDATION DRAINING.

   Concrete or masonry foundations. Drains shall be provided around all concrete or masonry foundations enclosing habitable or usable spaces located below grade. Drainage tiles, gravel or crushed stone drains, perforated pipe or other approved systems or materials shall be installed at or below the area to be protected and shall discharge by gravity or mechanical means into an approved drainage system. Gravel or crushed stone drains shall extend a minimum of 1 foot (305 mm) beyond the outside edge of the footing. The perforated pipe shall be placed on a minimum of 2 inches (51 mm) of washed gravel or crushed rock at least one sieve size larger than the perforation. The backfill over footing drains shall be pervious material of the type, size and gradation required for the particular type of drain construction being used for houses generally, either limestone or gravel No. 57, and shall be carried up to within 12 inches of the established surface grade. The top 12 inches of the backfill shall consist of 6 inches of an impervious (clay) soil, topped with 6 inches of topsoil if the surface is to be covered with lawn or shrubs. If the surface adjacent to the foundation wall is to be paved or have some similar treatment, then the backfill near the top may be a suitable base for such construction. (Ord. 2003-04. Passed 2-11-03.)