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Reeheeheeloy t1_jabgc1k wrote

I'd be concerned about moisture, that said you could restrict the convection potential in the airgap and that'd make it more insulated without the moisture risk.

Mount some horizontal plywood strips in there (kinda like shelves). That keeps more of the heat in the airgap at the same level, rather than it pooling at the top. Then it can radiate back into the room and keep the heat in the walls longer. Kinda like bubblewrap insulation.

Diagram:
Inner Wall I
Plywood strips E (because that's what it'd look like)
External wall L (you leave some vertical air gap still, just less)

IEL

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MinkOWar t1_jabjd8w wrote

Even if air were gelatinous enough for convection to be meaningfully affected by making baffles that way, you're mostly just making the air gap smaller, allowing more thermal bridging.

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