[Sierra1]

The only discrepancy I see in the drawing you plan on mimicking is the roof pitch, in the drawing is 11.8 degrees 2.4/12 pitch. The pitch you want is 18.5 degrees for a 4/12 which is going to reduce the low side (outside wall) considerably below the 8' shown in the drawing if you go out the 10' shown.

What @JLAlbert said might be a better option by setting the rafters on the existing sheds rafter header. This will get your starting point higher thus accommodating the steeper 4/12 pitch which will give you a higher outside wall.

Figure out what your outside wall is by running an 18.5 degree line over 10' at a 10' starting height.

 

[Sierra1]

You all make some great points that I should look more into. I would prefer not to build it free standing if avoidable -- digging down adjacent to the shed will be a PITA. I suppose a post outside of the existing pad would work, however that eats into the opening width by a several inches. The shed has had the chance to settle for 7-8 years...I was hoping to just attach it off the rear of that and keep it simple without any alterations to the shed. Hoping! LOL.

The 4:12 pitch was something that I read online, but, may not be required. Perhaps I could get away with less. I guess it depends what you read?

I'm happy to run whatever pitch/angle is appropriate, I'm not married to any. If I can use a 1:12 or 2:12, obviously that would be a lot more beneficial for losing less height.


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Are you going to have to get a permit for this? How do you get along with your neighbors, will they call the building dept on you?

I only ask because if you build it out of code, and they get involved you’ll have to change it to comply.

It also looks like you’re dealing with a slope anyway so if you go out 10’ you’re gonna need some fill or you’ll have to pull dirt from the shed out to get a level base.

If you dug down a little next to the shed and did like a two RR tie wall next to it you would gain more overall height on the outside wall of the addition and also gain some more fill.

just some thoughts

 

[Sierra1]

Ok, yeah you’ve been busy!!!