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Jack Studs Necessary?

Posted by bshanley (My Page) on
Wed, Aug 11, 10 at 19:07

I'm putting a 60 x 40 vinyl replacement window in the space where I removed a steel & glass single pane. The installation is in the basement, which has concrete block walls. I've done all the major framing with 2x6 pressure treated lumber. I can put the window between 2 king studs, without jack studs. I won't be using any cripple studs because the new window goes all the way to the sill. But I see jack studs in all the how-to books. What is their purpose? Will the 2x6's twist without them, or something? Thanks.

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RE: Jack Studs Necessary?

The header is supported by a jack stud at each end. Jacks, sometimes called trimmers, fit under each end of a header, and they transfer the load that the header carries down to the bottom plate and the framing beneath. Nailed to the jacks are full-height studs called king studs; they support the assembly between the plates. Sometimes jacks must be doubled on wide openings so there's enough supporting surface for the header to bear on. Jacks can be replaced with a steel header hanger attached to the king stud.

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