Add function to analyze ceiling joists with gyp. bd. on bottom and no sheathing on top. Or, provide option within floor joist module to run as ceiling joist instead of floor joist.
In columns "Top Edge Bracing" and "Bottom Edge Bracing", select "End Supports Only".
To my knowledge, the design module does not actually consider sheathing in its calculations, only the end effect of the bracing that sheathing would provide. So removing continuous or periodic bracing between the supports effectively achieves what you want here.
I am looking for ceiling joists for vertical loads, without sheathing. As the user noted below, i have been using roof rafter design but unless things have changed, they do not allow the option for no sheathing.
We'd like to understand a bit more about your request so we can plan this effort appropriately. Are you looking for ceiling joists to be analyzed for vertical loads only (similar to floor joists)? Or, are you looking for analysis of members with thrust? We can add ceiling members fairly easily for vertical load analysis, but designing for thrust is a larger effort for us. Thank you for your input!
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To achieve "no sheathing":
Navigate to the "Spans & Supports" page.
Scroll down to the bottom table.
In columns "Top Edge Bracing" and "Bottom Edge Bracing", select "End Supports Only".
To my knowledge, the design module does not actually consider sheathing in its calculations, only the end effect of the bracing that sheathing would provide. So removing continuous or periodic bracing between the supports effectively achieves what you want here.
I am looking for ceiling joists for vertical loads, without sheathing. As the user noted below, i have been using roof rafter design but unless things have changed, they do not allow the option for no sheathing.
I would like the wording to say ceiling joist with ceiling live load.
We'd like to understand a bit more about your request so we can plan this effort appropriately. Are you looking for ceiling joists to be analyzed for vertical loads only (similar to floor joists)? Or, are you looking for analysis of members with thrust? We can add ceiling members fairly easily for vertical load analysis, but designing for thrust is a larger effort for us. Thank you for your input!
Just use roof rafters, same deflection criteria.