Learn how to laminate beams and assemble decking and rails for a woodland footbridge.

Homeowners want a footbridge to help them cross a deep ravine on their property. When the area is dry, crossing the gulley at the bottom requires a hop, but rains and runoff can add slippery banks and rushing water as additional obstacles. Consequently, the bridge will be high enough to avoid the steep banks and any flowing water. Built of laminated four-by-six support beams, pre-cut posts, decking and side rails, the 12-foot length of bridge will span the gulley resting on heavy block piers.

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leveling the piers
Step 1

Level the Ground and the First Two Concrete Support Piers

Use shovels and hand tools to level areas at the four corners of the bridge for supporting concrete blocks/piers. Position and level the first two piers at one end of the bridge using a bullet level and a bar level.

clamping the planks to the metal straps on the piers
Step 2

Use 12-Foot Planks to Position Piers on the Opposite Bank

Clamp 12-foot planks to the first two piers, ensure they are parallel and mark the other ends as locations for a second pair of piers. Level the ground, position and level the piers, and temporarily clamp them to the planks.

hammering in carriage bolts
Step 3

Laminate Two-by-sixes into a Pair of 12-Foot Support Beams

Apply construction adhesive to a 12-foot two-by-six plank and clamp another on top. Pre-drill for carriage bolts every 24 inches, inject silicon into the holes, drive in bolts, and secure them with washers and nuts on the opposite side. Repeat.

boring through the holes on the metal straps
Step 4

Bore Holes in Beams for Attaching Metal Straps on Piers

Position footbridge beams on piers and drill holes into the wood through the metal strap on each pier. Add silicon to each hole, drive in a carriage bolt, and secure it with washers and nuts tightened with a socket wrench.

clamping pre-cut railing posts in place
Step 5

Position and Secure Pre-cut Railing Posts with Carriage Bolts

Temporarily clamp pre-purchased railing posts in position along the footbridge. Pre-drill holes, add silicon waterproofing, hammer in the bolts, and secure with washers and nuts.

securing the first tread
Step 6

Measure and Cut Treads for the Bridge Deck from Two-by-sixes

Measure the distance between the outer edges of the two beams for tread length and add two inches for overhang. Center the first tread across the end of the beams, pre-drill holes, and drive in rust-resistant deck screws.

marking cut lines with a speed-square
Step 7

Notch Treads as Necessary to Fit Around Railing Posts

Use a speed-square to mark cut lines on planks that butt into railing posts and notch them with a jigsaw. Space all planks 1/2 inch apart, pre-drilling and securing each while working across the bridge span.

coating the ends of deck treads with wood preservative
Step 8

Coat the Cut Ends of the Treads with Wood Preservative

Use a paint brush to liberally coat the cut ends of the deck treads with wood preservative to prevent moisture from promoting wood rot. Walk on the bridge to test its sturdiness and balance.

position the handrail
Step 9

Position the Garden Bridge Handrail and Secure with Rust-resistant Screws

Position and clamp a handrail to the railing posts and secure it with rust-resistant screws. Repeat this process for the other side of the trail bridge to complete the project.

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