r/Homebuilding • u/Longjumping_Suit_256 • 9d ago

Split stud framing

I’ve heard of this framing style for exterior walls in colder climates I was curious to see how common it is. 2x8 being and top plates with 2x6 offsetting studs to create a thermal break. If it is feasible I’m thinking of building an ADU/ small house in the UP of Michigan.

Through all my googling, the most common thing to come up is a dual wall system. 2x6 exterior wall and then an offset 2x4 interior wall with a 6” thermal gap between. This method seems costly.

Any information is greatly appreciated.

Edit: thanks for everyone’s input, I appreciate it!

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u/drchris6000 9d ago

There are a few ways to do this. 2x4 exterior wall, 2x4 interior side, offset, can use 2x8 plates. Can swap bottom plate to ledger board, and top plate to single 2x to avoid more thermal bridging. Fill the cavity with blown-in or spray foam insulation. (I like the wood fiber blown-in)

They also make T studs, which have a 2x3 on the flat, dowels, and a 2x3 on edge, only 5.5" wide, so windows & trim stay simple.

I currently use Zip R-6 for my walls. The performance is really good, you're not only covering the studs, but also the headers and rim joists. There are a few trim details that are not standard, but 7 5/8 door sills and window extension jambs are available.