4 replies to this topic

[Dennis Hilborn]

I have a 12/12 roof that I need to cut out a rectangular section and add a 5/12 shed roof to add a window.  Around here we call it "ditching" I have heard it called a reverse dormer.

I can cut the hole in the roof but CAN NOT figure out how to apply the shed roof that fits in the hole.

Adding a shed roof is pretty hit or miss for me anyway, most of the time it slopes the wrong direction.

[Kevin Rabenaldt]

There may be techniques others use, but I always use beams and walls to reference roof edges.  If needed you can use designate hidden under edit of the wall or beam so that it does not show on the floor plan printouts.

[Dennis Hilborn]

Ah, you're right.  I didn't think about using hidden beams.  I'll try that in the morning.  Thanks for the reminder.

[Keith Almond]

So you want to add the dormer sort of under the roof finish? Doesn't that lead to water problems?

[Mark Petri]

You can leave the existing roof for the moment, select "draw dormer" and add in the specifics of the window and wall definition you want to use, then place the dormer. It will not always do exactly as you want, but it's a place to start. Then, go in and adjust the walls and opening as you want it. Then, adjust the roof to be how you want the shed roof to look (overhangs, soffit, fascia, etc. if not already as you want it). Then, right click on the new shed roof and select "apply hole" to cut a hole in the 12/12 roof.