extending wall layers

[MikeJarosz]

A typical drywall detail is to run metal studs to the slab above, but the drywall only 6" above the hung ceiling. I discovered that the wall assembly layers are adjustable. [page 519 of the krygiel/read/vandezande manual]. The manual cautions that only adjacent layers can be unlocked. So I figured I would unlock the two gypsum layers and the core (stud) layer, then leave the studs attached to the slab and drag the two gypsum layers down to the right elevation.

To my suprise, when I went to edit the wall, Revit offered only one blue triangle for dragging, not the 3 I expected! The manual does caution that you "cannot unlock wallboard layers on both sides of a framing layer".

What was the Factory thinking when they imposed this limitation??????? Does anyone know a way around it? Why would I want to only do one side? What if the ceiling heights on either side are different?

Another Revit gotcha!

[MikeJarosz]

I figured it out. I made the stud variable and the gypsum fixed. You can then enter the wall offset from the upper slab, say -3', then drag the stud layer +3' to the slab above.

Slightly clumsy, but it results in a correct appearance.

[sthedens]

So how would that work if your "slab" above wasn't a slab but a sloping roof deck? Normally, the user would attach the wall to the underside of the roof deck. In this case, your wall board would attach.

[MikeJarosz]

I tried it, and it didn't appear to work. I even edited the sloped roof and closed the sketch. It woudn't attach. This feature appears to need more work from the factory.

[craig.donison]

More work and bug fixes. I'd like to caution you when taking this approach to building your walls because it can cause some odd things to occur with your material takeoffs. Volume of material is calculated correctly while surface area of material is quite buggy and does not calculate correctly in sceduling.

If you're just going for a visual look, it shouldn't be a problem, but if you're also trying to get meaningful model data out of your materials you'll need to pay close attention to your numbers. There are ways to fix the problem, but it requires monkeying around with different wall types for individual layers, or by using custom parameters and calculated values.

More about this can be found here:

http://forums.augi.com/showthread.php?p=1017004#post1017004

[sbrown]

you might try a stacked wall scenario with lower wall with gyp. upper just stud?

[MikeJarosz]

That was my first thought, but I stumbled onto this technique in the new 2011 Revit manual and gave it a try.

Y'all out there read the manuals every day, right?