When installing a waterproof membrane on a foundation wall below grade, where should the membrane terminate at the top?
Correct Answer
B) 6 inches above finished grade
Waterproof membranes should extend at least 6 inches above finished grade to prevent water infiltration and provide protection against surface water and splash-back. This ensures complete protection of the below-grade portion of the foundation.
Why This Is the Correct Answer
Waterproof membranes must extend 6 inches above finished grade to provide adequate protection against surface water infiltration, splash-back from rain, and seasonal water level variations. This elevation ensures the membrane covers the critical transition zone where water can penetrate between the foundation and surrounding soil, maintaining complete waterproofing integrity for the below-grade foundation system.
Why the Other Options Are Wrong
Option A: At finished grade level
Terminating at finished grade level leaves the foundation vulnerable to water infiltration from surface runoff, splash-back, and minor grade variations. This creates a potential entry point for moisture at the most critical junction between above and below-grade areas.
Option C: 4 inches below finished grade
Terminating 4 inches below finished grade exposes the upper portion of the foundation wall to direct water contact and infiltration. This defeats the purpose of waterproofing by leaving the most vulnerable area unprotected from surface water and weather exposure.
Option D: At the top of the foundation wall
Extending to the top of the foundation wall is excessive and unnecessary for below-grade waterproofing. This wastes materials and doesn't address the specific requirement for protection against surface water infiltration at the grade transition zone.
Memory Technique
Remember 'Six inches ABOVE to keep water at bay' - the membrane needs that extra height above grade to protect against splash and surface water.
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