Floor and flat roof on same level

[m.kleinmann]

Another newbie question... I have a design that has a floor and also flat roof and roof overhangs on the same level - see screenshots below. So here's my question. Do I model the floor separately as a floor to the exterior walls and then draw the rest as a roof? I currently have the entire slab drawn as a roof and was wondering what the best practice for something like this is?

[S.Jebakumar]

Hi @m.kleinmann,

The option is open you can either use Roof or Floor based on the complexity of the roof.

As roof command has few more options to model a roof(complex,curved,sloped etc.,) than floor.

but for flat roof as yours we can use floor as well.

Regards,

Jebakumar

[m.kleinmann]

Thx for your help.

[ToanDN]

It really depends on how you design the floor assembly and the roof assembly. For example, if the structure is concrete then the roof area is normally depressed for insulation and slope to drain. What is your design?

[m.kleinmann]

It is a 24" wood truss, flat at floor area w a 4" drop where it changes to roof. Roof section has 1/4:12 slope. Roof is 60mil TPO w 1" insulation board.

[ToanDN]

I would model them separately as a floor and a roof so that you will have more controls with the materials and the roof slope.  Assuming the ceiling is continuous, you can give the floor and the roof the same ceiling finish material and join them together.

[m.kleinmann]

I did some tests on this and modeled floor and roof separately in one instance. The one issue I see with this that the section profile now clearly shows the split, when in reality it is one continuous truss. What if I modeled the truss as one and then added the roof, floor and ceiling materials separately?

Would I use "structural floor or roof" for the truss, "floor" for the floor covering, "roof" for the roof covering and "ceiling" for both interior ceiling and soffit?

[ToanDN]

If you are willing to model and coordinate all different layers as separate
components then go for it. As for the visible joints you mentioned, it
should not be there if you join the two pieces together.

[m.kleinmann]

Good point... I have never tried joining two elements, so not sure what happens during that process. We need to schedule everything, ie sf of soffit material and sf of drywall ceiling, sf of roofing material and sf of flooring - what happens on the scheduling end if floor and roof are drawn separately and then joined? Is just the core layer joined or all layers in that element?

[ToanDN]

Scheduling can work with either approach if you model and assign materials correctly. Pick one that you are more comfortable with and let us know how it go.

[chrisplyler]

If you want that much detail, I would make a Structural Framing family for the trusses. Then a floor on top of it at the interior, and roof on top of it at exterior, and ceiling below it. I mean, that's how it is in real life, right?

xtn

[m.kleinmann]

Thx all for the different solutions - I will try all and see what works best for our scenario.