Scissor trusses

[BillyEv]

Hello 

 

Any ideas on how I get CA X15 to build scissor trusses?  I made them about a couple weeks ago, then went on to tackle some other bugs.  Now the trusses are being made like this.

 

I did read the instructions (LINK) and made ceiling planes, as you can see below.  But when I direct CA to make framing, I get these joists and not a scissor truss.

 

Thanks in advance for any advice.

 

 

 

[ValleyGuy]

You will need to change the direction of the trusses. You will most likely also want to build a truss base over the other roof to support your valley trusses??? There are good videos in the training video library dealing with the roof, it's defaults, and the framing. You can access the videos through your dashboard > search roof. Lots of good info, check them out.

[BillyEv]

I can build a truss manually and copy it but i'll be danged if I can get CA to auto draw.  Any tips on how to "change the direction" of the trusses appreciated.  I even altered  the dimensions of my deck to see if that was driving CA choosing joists over trusses.

 

  

[ValleyGuy]

Pulling the roof plane on the main house (peak point to soffit) should change the direction and create a truss base for you. Then make three ceiling planes over the deck with the centre one flat should make the scissor truss. Everything was done on auto roof and auto frame except the material and colour change at the end (to show better in the pictures).

Hope this helps.

 

[BillyEv]

Shayne, I tried that drag roof plan routine.  didn't rebuild the roof planes, but rebuiltt he framing.

 

I'm getting an odd truss layout towards the left hand side.  when I look inside....hollow like a tim horton's donut.

 

 

[ValleyGuy]

It appears that you have one truss off of the house fouling things up. I also see that you have a ridge board. 

 

Try deleting all the roof / truss framing.... Edit > Delete Objects > pick roof framing / trusses  / rafters for this floor.
Manually delete any ceiling planes over the deck.
Manually delete the roof planes over the deck and the associated main house single roof plane.

Shift select the two side railings on the deck and open them up. These should be room defining and under the rail panel, choose 'Rail to Beam'. I don't think that it will work without this.

Open the deck room and make sure that the roof over room is selected and the flat ceiling is not, which you probably already have done.

Make sure Auto Roof (check Trusses box) and Auto Roof Framing is on. This should make your main roof and your covered deck roof look like my first picture above.

Shift select the two roof planes on the deck and make sure that 'trusses' are selected under the general panel. In the structural panel make sure to uncheck 'Ridge' and 'Lookout'.

Pull the main roof peak point to the soffit - make sure that it is properly aligned with the soffit. It won't work properly if the points aren't snapped together to make a straight line. The roof planes won't really re-build other than make a rectangle again, but it will produce the truss base and add the valley truss framing.

You should see a pop up warning saying... it modifies.... Do you want to proceed?  Yes you do.

Follow with the rest of the above directions adding in the three new ceiling planes and Bob's your Uncle. If you pull an elevation and spilt your screen to see both, you can witness the growth of the scissor truss with each ceiling plane that you put in. If you pull a complete framing overview and see that you have a rogue truss extending through from the main house into the covered deck again, you likely have an issue that someone will need to look at your plan to solve.