Naturally beautiful wood; one of the oldest known building materials and only renewable resource, is still one of the best.  It's tough to beat the durability of properly treated wood. It won't crack or crumble like many other materials... and can't be damaged by continuous freezing and thawing. Salt won't pit it, water won't rust it; and it's simply not affected by temperature, alkali soils or acids. Today's strong, economical, and versatile glulams can last a lifetime when properly pressure treated and maintained. Glulam Footbridge Standard design configurations for HS-20 loading with spans ranging from 16' to 80' are available for single and multi-lane bridges. Larger spans are possible with truss or deck arch bridge designs. Longitudinal glulam deck designs offer low profile structures which are typically used for short spans ranging from 16' to 32' where clearance below deck is limited. Designs consist of deck panels spanning from abutment to abutment. Glulam stiffener beams are used to tie panels together and to distribute wheel loads. Read More... Links: Covered Bridges Jackson Covered Bridge Rehabilitation