Understanding Post Spacing
Proper post spacing is crucial for fence stability and longevity.
- Post Specifications Terminal posts: 2.875" OD. Line posts: 2.375" OD. Corner posts: 3" OD. Gate posts: 4" OD for 6ft gates. Schedule 40 minimum thickness.
- Spacing Guidelines Maximum span: 10ft residential, 8ft commercial. Wind load >80mph: reduce by 2ft. Sloped terrain: -1ft per 15° slope. Height ratio: 1/3 below ground.
- Foundation Requirements Terminal posts: 36" deep × 12" diameter. Line posts: 30" deep × 10" diameter. Add 6" depth for frost areas. Concrete: 2500 psi minimum.
- Material Standards Posts: ASTM F1043 Group IA. Fabric: ASTM A392 Class 1. Top rail: 1.66" OD minimum. Tension wire: 7 gauge coated steel. Ties: 9 gauge aluminum.
Installation Guide
Layout Planning
String line for alignment. Mark utilities first. Account for grade changes. Corner posts at >30° angles. Terminal posts at >30ft runs.
Structural Considerations
Soil type affects depth. Clay: +6" depth. Sandy: +25% diameter. Rock: reduced depth with epoxy. Drainage slope: 1" per post away from hole.
Cost Factors
Posts: $15-25 each. Concrete: $8-12/hole. Labor: $10-15/ft installed. Hardware: $3-5/ft. Additional bracing: $25/corner.
Maintenance Tips
Check tension annually. Tighten hardware spring/fall. Clean with wire brush. Touch up galvanized coating. Adjust gates seasonally.