New Joists with Mortise and Tenon Joinery

[Nick Ostrowski]

On top of the many inadequate structural repairs in the basement/crawlspace of this house, the workers made a mortise and tenon joint when a joist hanger would have been so much easier. I can't see there being much strength left in this tenon as it looks to have been cut too small. I still see many houses with the method of construction and I have the same in my own house but there's just better ways to do this now.

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[Jerry Peck]

Yep, they need to add hangers now (and should have added them even at the start).

[John Kogel]

It looks like the mortise hole was there, and the urge to poke a new tenon in there was just too strong.

[Thom Huggett]

Bending moment strength of a double 2x12, shear strength of a double 2x4....