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Stesso

Stress Test 'Not Overcut' Rafter to Failure

0:22
0:51
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At 0:22 in

Testing OVERCUT rafter tail framing

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What happens here

After the 'overcut' piece has failed and is removed, the second rafter piece, labeled 'NOT,' (representing a non-overcut birdsmouth) is then placed into the identical testing position within the wooden frame. The hydraulic power jack is once again used to apply controlled, increasing pressure. The pressure gauge is monitored as the force builds, and the 'NOT' rafter piece eventually breaks with a similar sudden snap, indicating its failure point under compression.

Goal: Determine the failure point of a 'not overcut' rafter.

Tools and materials

  • 'NOT' rafter piece N/A — The second lumber piece being tested
  • 4-Ton Porto Power Jack Porto Power Jack — Applying force
  • Pressure gauge N/A — Monitoring applied force
  • Safety gloves DeWalt — Protecting hands while operating the jack and handling materials
  • Wooden test frame N/A — Supporting the rafter piece

What they say

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Testing some framing. We got overcut and not overcut. Both the overcut and no overcut failed at 2,000 lb. This would be an extreme situation for a rafter with these

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