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if the rot was not removed or treated will if also effect the new 2x12 to rot as well. also if you sister the floor joist that has rot with a new one and did not cut or treat the rot will it effect those as well. also is it ok to support a cracked sagging joist with out sistering it but...

how do you go about killing the rot.

I am looking to buy a house and notice the main support beam in the crawl space was repaired. It was repaired by sistering a 2 x 12 on each side of the beam and another 2 x 12 on the bottom of the beam. They placed 4 x 4 posts every three foot placed on a footer cased in cement. The 2 x 12...