Specific Roof Questions

[dnkaye]

I guess I just have lots of these specific questions that bug me, and NCARB doesn't really give a clear answer to. Any general comments welcome.

But in this ALT roof vignette, there are 3 roof heights, two low slope and one higher slope. My questions: 1) How high does the second lowest roof edge have to be above the lowest roof edge? I left 2" (13-2" and 13'-4") because I didn't want to leave 0", although theoretically could I have? And would I need to flash the joint between the two lower roofs..?

[7togo]

NCARB 4.0 leaves 6". You can't fit a gutter and downspout in 2" which is required, in the 4.0 program anyway, for draining from one roof plane to another. "Design logic" would say leave about 6" for the gutter and downspout. Yes you need to flash wherever a roof plane hits a wall. The alt program I used for this vignette called for two skylights in the hall and two in the conference room FYI

[bing.katie]

7togo - I'm curious where you saw 4.0 specifying 6" between roof planes? I can't find that at all...

[7togo]

It doesn't, if you set the 4.0 vignette up the way they do in the exam guide sample passing solution and do the math it ends up being 6"

[vtmtbkr]

This can be done to eliminate one of your roof volumes, try something else.

In the real world you would need around 2' or more to provide proper flashing and gutter/downspout room, I don't know what it would need in the NCARB world since the program doesn't tell you.