Need to strap a ceiling. Show me the way.

[GeneDavis]

I've a huge attached garage (Shhhhhh!  Don't say Barndo) with roof trussed at 24 inch centers, and the ceiling finish is to be 29 gage ribbed roofing panel, Fabral's Magna Rib 3 or equal.  I need to strap it with 1x3s at 16" centers.  Is there a way since we are in this new age, the 2020s, AI and all that, X18 now fully live, that this can be done, or do I gotta hack it.

[robdyck]

Hey Gene, all you need to do is add a framing layer to the ceiling finish for that room. Super simple.

[GeneDavis]

Hey, @robdyck, thanks, but I did that, and it won't frame.  What is the secret for Chief autoframing it with the 1x3s I specified (3/4" thick framing layer above my ceiling finish, 16" centers, 2.5" widths, fir framing 1 texture, layer specified as framing), and those straps run perpendicular to the trusses?

[JonathanK]

I think this might be a bug...

I thought that maybe you put it on the ceiling layer of the roof, but for some reason...this places purlins on the bottom side of the top chord of the truss.

 

So it looks like either manually draw the framing, or try and build a floor above with invisible walls and 3/4" thick floor...or something like that.

 

[robdyck]

If you add framing to the Ceiling Finish layers, the framing will build separately for each room. And, it may not fully build until a joist direction arrow is created.

BUT, if you add the framing to the Roof Layers > Ceiling:  then the purlins will build more continuously and will disregard room boundaries...but look closely and you'll see that they are attached to the underside of the top chord.