Exterior stringers must never make direct contact with bare soil or lawn turf. Moisture absorption causes rapid wood rot, microbial decay, and differential settlement.
Landing Pad Specifications
- Minimum Dimensions: 36 inches wide by 36 inches in direction of travel.
- Slab Thickness: Minimum 4 inches of 3,000 PSI concrete over 4 inches of compacted crushed gravel.
- Elevation: 1 to 2 inches above adjacent grade to direct rainwater away from the stringer base.