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Garden Bridge Building Instructions

Garden bridges serve many purposes. You can build your own garden bridge that provides a walkway over a creek or thin pond on your property. You can also use a garden bridge as a functional decoration for your garden landscape. You can even join two small separate gardens and add stepping stones for a path. Building your own garden bridge can be less expensive than hiring a professional carpenter to build one for you.

Things You'll Need

  • Cordless power drill
  • Screwdriver bits
  • Circular saw
  • Pencil
  • Ratchet
  • 9/16-inch socket
  • Tape measure
  • Carpenter's square
  • 3/8-inch drill bit
  • 5/32-inch drill bit
  • 5, 1-inch by 8-inch by 6-foot treated boards
  • 8, 2-inch by 4-inch by 8-foot treated posts
  • 3, 2-inch by 8-inch by 8-foot treated posts
  • 1, 1-inch by 8-inch by 10-foot treated board
  • 1, 2-inch by 8-inch by 6-foot treated post
  • 75, 3-inch galvanized deck screws
  • 18, 3/8-inch by 3 1/2-inch lag screws with washers
  • 16, 3/8-inch by 3 1/2-inch lag bolts with washers and nuts
  • 100, 2-inch galvanized deck screws
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Instructions

  1. Cutting the Lumber

    • 1

      Measure and cut the five 6-feet long 1 by 8s into 10 pieces with 3-foot lengths.

    • 2

      Measure and cut the 10-feet long 1 by 8 into three pieces with 3-foot lengths. You should now have 13 1 by 8 boards with 3-foot length made from the 6-foot and 10-foot long 1 by 8 boards.

    • 3

      Measure and cut four 2 by 4s to four 32 1/2-inch lengths and eight 31-inch lengths. You can cut two 31-inch pieces and one 32 1/2-inch piece from one 2 by 4, totaling 12 pieces.

    • 4

      Measure and cut the remaining 2 by 4s to four 44-inch lengths and four 40 1/2-inch lengths, totaling eight pieces.

    • 5

      Measure and cut the 6-foot 2 by 8 into two pieces with 36-inch lengths.

    Frame Assembly

    • 6

      Mark the center of two 36-inch 2 by 8s.

    • 7

      Attach one 8-foot 2 by 8 to one end of a 36-inch 2 by 8. Line up the end of the 8-foot board so that it is flush with the end of the corner of the 36-inch board. You will be attaching the top of the 8-foot to the face of the 36-inch. Secure with two 2-inch deck screws in the top and bottom edge, from the opposite side of the 36-inch through to the 8-foot.

    • 8

      Attach the second 36-inch board to the bottom of the 8-foot board, in the same manner as the top.

    • 9

      Place a second 8-foot board in between the two 36-inch boards, at the center marks you made, and attach. Attach a third 8-foot board to the other end of the 36-inch boards, making sure they are flush.

    • 10

      Drill three 5/32-inch holes through the top and bottom 36-inch boards into the 8-foot boards. Your holes should be in a straight line. Secure lag screws and washers in each hole and tighten with the ratchet and 9/16-inch socket.

    Guard Rails

    • 11

      Use the carpenter's square to mark and cut the corners off one end of eight 31-inch boards.

    • 12

      Lay two 40 1/2-inch 2 by 4s and two 32 1/2-inch 2 by 4s out. Place the bottom edges against the long section of the frame to act as a guide stop. The tall 2 by 4s should be parallel.

    • 13

      Mark a width center line on the two 40 1/2-inch 2 by 4s. Mark a center line at both the top and bottom of the posts. Use a straight edge to connect the two marks together down the length of the two posts.

    • 14

      Attach one 31-inch board to two of the posts, lining up the edge, on the long side, of the 31-inch with the top edges of the 2 by 4s and the short edges of the board should line up with the center guideline you drew.

    • 15

      Mark 13 inches from the bottom edge of the board down the length of the 2 by 4. Attach a second 31-inch board, lining up the top end edges with the 13 inch marks and the ends with your 2 by 4 center lines. Attach with 3-inch deck screws.

    • 16

      Position the two of the 32 1/2-inch 2 by 4s on the left and right of your middle section. Each 32 1/2-inch should be spaced 21 inches from the taller 2 by 4s.

    • 17

      Place one of the angled 31-inch boards on the left side, on top of the short and tall 2 by 4s. Line the top edge flush with the top left corner of the 32 1/2-inch 2 by 4; the angled end should be butt against the end of the 31-inch attached to the tall 2 by 4. Secure with 3-inch screws at both ends. Repeat for the right side, connecting the middle section with the two side sections. The boards should be sloping downward.

    • 18

      Attach a second board to each side 12 1/4 inches from the top board.

    • 19

      Repeat steps 2 through 8 for the second rail. Temporarily attach the side rails to the 8-foot lengths of the frame with 2-inch decks screws, making sure the railing 2 by 4s are flush with the ends and bottom edge of the 8-foot boards.

    • 20

      Drill two 3/8-inch holes into each 2 by 4 through the 8-foot boards. Avoid hitting the lag bolts on the frame. Remove the screws and the railings.

    Final Assembly

    • 21

      Place the bridge frame in the location desired. Reattach the sides using the lag bolts, nuts and lock washers. Hammer the bolts through the holes if necessary.

    • 22

      Place the nuts on the end of the bolts and tighten with the ratchet and 9/16-inch socket.

    • 23

      Place the remaining 31-inch boards along the frame, in between the railings. Space the each board 3/8-inch apart to allow water to drain through.

    • 24

      Attach each board, using three 2-inch screws, to each of the three 8-foot boards. The first and last boards will also need four 2-inch screws in between the three securing screws.

    • 25

      Paint or stain as desired and allow it to dry.