Repairing Knothole Crack In Floor Joist
While opening the ceiling in our garage to install Uponor Joist Trak under the subfloor of a bathroom above I noticed that a crack had developed in a 2x12 joist knothole. The unsupported joist span of the 2x12 is 19' and the ends rest on 2x6 plates. The crack is located 60" (5') from the wall. The crack extends up 3-1/2" on one side of the joist and 2" on the other side. There is no sagging of the joist and the crack does not extend past the knothole.
I was thinking of sistering two 2x12 boards, one on either side of the joist, that extend 300% of the depth of the 2x12, extending out from both sides of the crack. That would be 3 x 11-1/4 = 33.75" x 2 = 67.5". So the repair 2x12's would be 67.5" long and be centered on the crack. I would apply construction adhesive to the mating surfaces and secure the sandwich together with 1/4" Simpson SDS screws or 5/16" GRK structural screws. How does this plan sound? What schedule (pattern) is recommended for the screws?
Thanks for taking the time to read my post and consider my questions.