I am planning on adding an attached garage to my house and am struggling with the roof design. My house has engineered trusses on a 6/12 pitch and I would like the adjoining garage to keep the same pitch / ridge height as the house. The garage / house would share the right sidewall and are both 50' long.

That said, I would like to avoid additional load on the trusses if possible. Is there an easy way to do this or will I end up re-engineering my roof to accommodate the added weight of whatever goes in between the two gables?

Your local residential architect IS THE solution and best if by-the-hour.
Cheapest way is to supply house plans on hand.
All the best!

I agree with the above comment. To me, you are going to need to rid yourself of that horizontal valley that is created. I can walk through it over the phone or you can bounce some idea off of me to make sure I understand the problem.

First....

A cartoon....

IN PLAN VIEW



is this accurate? The RED line is a valley and it is perfectly horizontal with the earth and you want to know how to drain that valley effectively?

IF THE ABOVE IS SORT OF CORRECT....

How about...



Then you can basically put a triangular ridge/valley system in between your two slopes. Make these pitches notable. It won't look amazing from the front, but unless I totally misunderstand, then I think this is a geometrical and symmetrical option that I often see on designs. Ice and water membrane the entire area and up both sides a little and this will be water tight.

Either way, kudos to you for having the forethought to think about this. I have encountered it in the wild and they will eventually leak without some additional architectural framing around it.

I apologize if I am way out in left field on this. Just trying to visualize.

Just pay mostly attention to the arrows denoting slope direction and water flow direction.

The appearance is kind of what I am struggling with. What are your thoughts on keeping the 8' ridge you have shown between the two buildings as it is drawn in your sketch but deleting the hip?

I would essentially be creating valleys along the roofline on both sides all the way down. Also, it might help if I mention this is going to be a 100% metal roof

I sent a PM. There are no hips in my drawing, all valley or transitions. Red is Valley, light green is ridges, dark green is eaves, and yellow are rakes. I think I get what you want to do and I can pillage my hi res satellite imagery for a better understanding and then cad it as I did above for you here. It should give you a good idea of what can be done. Like i said, my 3D brain is a little iffy until I see things in 3D from an image.

I think so. Thank you for the help!

I think I finally got this figured out.... changed the direction of the ridge on the addition from my previous post.



Do you see any issues with this design? The 2 & 4 pitch shed roofs on the left and right side is a wrap around porch adjacent to the addition.