Understanding Curbing Design
Proper concrete curbing calculations ensure durability and proper drainage.
- Standard Dimensions Height: 6-8". Width: 6-9". Reveal: 6". Base: 12" wide. Depth: 18" below grade. Length: 10' sections. Radius: 3' minimum.
- Material Requirements Concrete: 4000 psi min. Air: 6-8%. Slump: 1-3". Fiber: 1.5 lbs/yd³. Rebar: #4 continuous. Ties: #3 at 24" O.C. Joint spacing: 10'.
- Design Specifications Slope: 1/4" per foot min. Gutter flow: 2-5 ft/sec. Loading: H-20 traffic. Exposure: severe. Salt resistance: required. Drainage: 2% cross slope.
- Performance Criteria Compressive strength: 4000 psi. Flexural strength: 650 psi. Air void: 5-8%. Absorption: <5%. Scaling: none at 50 cycles. F/T cycles: 300.
Installation Guide
Site Preparation
Subgrade: 95% compaction. Base: 4" gravel. String line: both sides. Grade stakes: 25' O.C. Curves: flexible forms. Expansion joint: 100' O.C.
Placement Methods
Slip form: 500+ LF/day. Hand form: 200 LF/day. Extruded: 1000+ LF/day. Joints: tooled 2" deep. Finish: light broom. Cure: 7 days min.
Cost Analysis
Material: $12-18/LF. Labor: $8-12/LF. Forms: $2-4/LF. Machine: $1-2/LF. Joints: $0.50/LF. Total: $25-35/LF installed.
Maintenance Guide
Inspect annually. Seal joints: 5 years. Clean: semi-annual. Repair cracks: when >1/4". Replace sections: when settled >1". Salt resistant sealer.