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or in front of joist.

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For example (using piece of white paper as stand-in for wall) - Wall installed behind integral joist

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So, Mike, here's another option: this is the space leading from the attic to the stairs - as you can see, it is hazardously wide - and, from a health and safety point of view,  an improvement, therefore, might be to create a partition wall here that still allows access to the stairs and adds wall surface to the attic.