Section 1805 of the International Building Code and Section R406 of the International Residential Code is hereby amended by adding thereto the following:
1805.2.2 & 1805.2.2.1 Walls. & Surface preparation of walls, and R406, R406.2, subsurface drainage system shall be included as an alternative to waterproofing. Add Backplaster and Dampproofing
Exterior foundation walls below grade of any building consisting of masonry units having a basement shall be backplastered with one-half inch (1/2") Portland cement and sand mix (1:2 1/2 by volume) or two one-fourth inch (1/4") coats of Type M mortar, and with an approved dampproofing material. Poured concrete foundations shall be coated with dampproofing without back plaster. Alternative dampproofing may be approved by the building official.
1805.4 Delete existing and add Subsurface Drainage Systems
All buildings constructed with basements or floor levels twenty-four (24) inches or more below the elevation of the center line of the adjacent public street shall be provided with a subsurface drainage system. A subsurface drainage system shall consist of the minimum following elements:
(1) Minimum four (4") diameter perforated or scored drain pipe embedded in four inches (4") of coarse gravel installed around the inside of the perimeter footing such that no floor location is greater than ten feet (10') to such drain pipe.
(2) Minimum fifteen inch (15") diameter by thirty inch (30") deep sump pump pit for each one thousand five hundred (1,500) square feet of floor area to be drained.
(3) Minimum two inch (2") diameter weep holes through the footing at eight foot (8') on center intervals with a minimum of four inch (4") of gravel cover on the exterior of the footing.
(4) Minimum four inch (4") gravel bed under floor slab.
(5) A 3” minimum diameter pipe shall be installed through the floors and into the attic, capped and sealed to facilitate a future soil gas ventilation system.
(Amended by Ordinance No. 8955, effective 03-31-2005) (Amended by Ordinance No. 9162, effective 05-01-2008) (Amended by Ordinance No. 9365, effective 03-30-2012) (Amended by Ordinance No. 9481, effective 04-15-2014)