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Test Deflection at 12 Inches On Center

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Will composite decking break? #deck #carpentry #homeimprovement

What happens here

With the wood blocks placed 12 inches apart (12 inches on center), the tester steps onto the middle of the composite deck board. The deflection is observed and measured against the speed square. The video states that the board deflects 1/8 inch under the tester's weight.

Goal: Measure the deflection of the deck board with joists spaced 12 inches apart.

Tools and materials

  • Composite Deck Board — The material undergoing the deflection test
  • Milwaukee Speed Square Milwaukee — Measuring the deflection
  • Wood Blocks — Providing support for the deck board at 12-inch spacing