Understanding Composite Decking
Proper composite decking calculations ensure optimal material usage and installation.
- Board Specifications Standard: 5.5"×1"×12-20'. Fascia: 11.75"×0.75". Span rating: 16" O.C. Weight: 2.5-3.5 lbs/ft. Expansion: 1/8" gap per 20°F change.
- Installation Requirements Joist spacing: 12-16" O.C. End gap: 1/8-1/4". Side gap: 1/8". Slope: 1/4" per foot. Cantilever: 3" maximum. Blocking: 4ft O.C.
- Performance Ratings Slip resistance: >0.5 coefficient. Fire rating: Class B/C. Span rating: 100 psf. UV protection: 25-year fade. Stain resistance: 25-year.
- Pattern Options Straight lay: least waste. Diagonal: 15% waste. Herringbone: 20% waste. Picture frame: add 10%. Inlays: add 15%. Feature strips: 5%.
Installation Guide
Fastening Systems
Hidden clips: 24/100ft². Face screws: 350/100ft². Pre-drill required. Stainless steel only. Clip spacing: 16" O.C. End clips: 1/2" from edge.
Support Structure
Joists: PT lumber only. Ledger: flash properly. Beams: 2×8 minimum. Posts: 6×6 recommended. Footings: below frost line. Hardware: ACQ rated.
Cost Analysis
Boards: $7-12/ft². Fasteners: $2-4/ft². Structure: $8-12/ft². Labor: $6-10/ft². Railing: $30-50/ln.ft. Stairs: $50-75/step.
Maintenance Guide
Clean bi-annually. Power wash <1500 psi. Remove debris monthly. Check fasteners yearly. Repair scratches with heat gun. Seal cuts.
Design Considerations
Layout
Plan board direction for best appearance.
Expansion
Allow for thermal movement.
Drainage
Ensure proper water runoff.
Support
Follow joist spacing requirements.
Pattern Guide
- Straight Pattern Traditional look, efficient material use.
- Diagonal Pattern Unique look, requires more material.
- Herringbone Pattern Decorative pattern, complex installation.
- Custom Patterns Mix patterns for unique designs.
Installation Tips
- Acclimation Allow boards to adjust to site conditions.
- Fastening Use manufacturer-recommended fasteners.
- Cutting Use appropriate blades for clean cuts.
- Maintenance Follow cleaning and care guidelines.