Hi. I'm trying to plan advanced framing on a house I'm designing.

I'd like to see if my understanding about on center spacing is correct. For example, my house is 40' on the long side. So if I start at the corner, the first stud should be 2' from the edge of the foundation (not the center of the corner stud). The following studs should all be 2' OC from the center of the previous stud, all the way to the second to last stud which should be 2' from the edge of the foundation.

The short side of the house is 18'. Since I'm dealing with the corner studs of the long wall, after the first stud is placed perpendicular from the corner stud of the long wall, the second stud would be 6 1/4" OC from the edge of the foundation which is repeated on the opposite corner as well no? Then from there, it's up to me to deal with the left over space (from my calculations 11") in the layout of this wall. In this case I just have one stud bay 11" wide, while the rest are 2' OC.

Since the window placement relies heavily on this I don't want to be off from the start. Am I on the right track?

Thanks

What kind of roof? Gable or hip? Roof trusses or stick built? Where the studs on the 18' long wall lay out depends on this.

Sorry, the 18' wide walls are gable walls for the simple gable roof and I plan on a truss roof.

With the 18' wall being a gable end and trussed roof, where the studs are located is not critical since it is not a load bearing wall. Just maintain your 2' stud spacing for attachment of exterior sheathing and interior drywall. Generally, you would install the studs on that wall beginning at one corner, come in from the outside edge of the framed wall 2' to the center of a stud and every 2' along the wall till you come to the opposite corner. There are several ways to do the inside of the corners for drywall attachment. Search google images for [advanced framing corner] for different options such as 2 stud or 3 stud corners.

What kind of exterior will you have? Siding or brick or ? If using brick, this often results in a 4" offset to the outside on your gable truss.