I just looked at a 11 year old house where a 2x12 first floor joist had a sudden failure leading to a series of (4) 5" deep x 3/8" wide vertical cracks formed in the the mid depth of the 2x12 joist about 8" on center from the support. The cracks stop about 3" from the top and bottom of the joist. There owner said there was a loud pop and the floor moved almost like a small earthquake happened with the epicenter being the end of the joist. The ceramic tile above the joist is delaminated and tented up. The effected end of the joist is about 1/8" lower than the adjacent joists. It apears the crack was triggered by the joist drying out (middle of a severe winter) and most likely due to a failure in the material. The joist is not subject to any concentrated loads. Anybody familar with a failure such as this in a wood?
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