Old House Journal - - Salvage It -

Try­ing to jack up joists that have set into a crook over a long pe­riod of time usu­ally doesn’t work. Push­ing up on the cen­ter low point of the joist will yield un­wanted con­se­quences. The joist pocket (par­tic­u­larly if the joist is fire-cut at a slight an­gle) will fill up with de­bris. As the joist is forced up­ward, that de­bris com­presses and puts pres­sure on the ex­te­rior ma­sonry or wall, some­times caus­ing units to dis­lodge or the wall to buckle. Re­verse bend­ing some­times will in­duce crack­ing in the top of the joist; bent floor­ing nails will re­sist move­ment in the op­po­site di­rec­tion.

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