The proper attention to waterproofing below grade structures is critical and cannot be overstated. In every structure where the floor elevation is below the level of the finished natural grade outside, proper application of appropriate materials is essential to stopping moisture penetration for the life of the structure.
Bituthane, a WR Grace product, is a composite membrane of rubberized asphalt and cross laminated, high density polyethylene film, ideal for waterproofing concrete, masonry and wood surfaces. A primer is applied first and the bituthane membrane self adheres to that. A protective fiber board can be added before backfilling the structure to prevent punctures from rocks and other sharp materials. In these photos the membrane has been applied to a clear line above grade. Finished stucco will cover the wall above and come below grade to cover the bituthane joint.