When placing urban outdoor furniture on a deck, understanding weight restrictions is crucial for safety and structural integrity. Most residential decks are designed to support 40-50 pounds per square foot (psf), while commercial decks often handle 60-100 psf or more. This includes both live loads (furniture, people) and dead loads (the deck structure itself).
To calculate your deck's capacity:
1. Determine total load capacity (psf) × deck area (sq ft)
2. Subtract existing dead loads
3. Account for dynamic factors like snow or crowds
Common furniture weights:
- Metal benches: 80-150 lbs
- Concrete planters: 100-300 lbs
- Wood dining sets: 200-400 lbs
- Composite loungers: 50-120 lbs
Distribute weight evenly and avoid concentrating heavy items. Place substantial pieces near support beams or walls rather than in the center of spans. Consider the furniture's footprint - larger bases distribute weight better than narrow legs.
Regularly inspect for signs of overloading: sagging, cracking, or unusual movement. When in doubt, consult structural engineers or local building codes, as requirements vary by jurisdiction and deck construction. Proper weight management ensures both safety and longevity of your outdoor space.