Birdsmouth for rafters on high end of shed roof not correct


chungus
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I'm building a single pitch shed-style (lean-to) roof and Home Designer does not correctly seat the rafter on top of the high wall with a birdsmouth. The low end is correctly shown, but the high end just shows the full rafter without any cut or adjustment to sit on the top plate- it only sits on the corner.  

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Screenshot 2026-03-29 151312.jpg

Shown is the small gap created and this occurs on every rafter. The end wall top plates matched the pitch, but I just wanted a birdmouth to sit flush on the sill plates and automatically lower those top plates. Is there a way to get this to work right? 

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  • 5 months later...

I went into Home Designer Pro 2025 and experimented with this. The software would not generate the 2nd top seat cut even after employing various methods, including following suggestions made on Google, and trying to "trick" the software. Home Pro is setup where many settings are fixed.

 

I ended up going into 3D framing view and positioned my camera to allow me to drag both top plates up and adjust wall framing stud heights as well. At least this will allow proper 3D views of the framing.

 

Max

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