DimSum 0.5.343

Released October 3, 2026.

Joist areas get rim on every outer edge, and a flush beam whose top lines up with the joists attaches on its own, hangers and all.

The same news is on the website's What's new page.

What's new

Rim all the way round. A joist area from the built-in Joist Tool now gets rim on every outer edge, not just the edges the joists run into.
Default Rim Edges, a new Joist tool setting, picks All edges or Joist ends only. You can still turn any edge on or off by hand.
Flush beams attach by their top too. A flush beam whose top lines up with the joists' top now attaches on its own, with hangers, just as it does when the bottoms line up. That works for a deeper beam, and for a shallower one such as a 2x8 header flush with 2x10 joists.

On each side with rim, the rim takes the edge joist's place. A 24' × 14' area is now 17 joists of 13'-9", with 6 pieces of rim.
When neither face of a beam lines up with the joists, DimSum tells you which one is nearer and by how much.

Existing jobs and your own copies of the Joist tool keep Joist ends only. Jobs placed with the built-in Joist Tool are offered the update, which you can take or skip.
A beam already in a job with its top lined up attaches when the job opens. Detach it if you don't want that.