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Kenny Easwaran's avatar

I think it would also be interesting to consider the opposite extreme. I visited the North Carolina Outer Banks a few years ago, and noted how transitory the islands and sandbars are compared to the houses and strip malls built on top of them. We usually think of the location a building is built on as a layer that is even more permanent than any of the building layers, but for a place like these barrier islands that naturally move on a timescale of decades or even years, but are still desirable places for people to live in or visit, it would be interesting to think about what construction methods are best for a building with just the right lifespan to be moved or replaced as the island has shifted.

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Meh's avatar

"Unreinforced concrete" in your foundation can mean a lot of things. Modern concrete has very different formulation from ancient concrete, and it matters; for example, modern concrete deteriorates if chloride ions get into it. So if you're going to use concrete, you have to make sure you get the chemistry right, and that probably means you're not going to be using anything you can just order from a random supplier. You need "advanced concrete" in the sense of having real control over the properties.

For that matter, not all reinforcement is corrodable metal. You could put a bunch of fiberglass or something in your foundation concrete, although admittedly future repairs might fail to maintain that.

Why a crawlspace and not a full usable basement? Even when you don't need to get below a frost line (and I do think you'd be a lot better of building somewhere where it doesnt' freeze at all), a basement is nice to have. You're already going to be excavating like crazy anyway.

It seems strange to try to fireproof steel framing with concrete or brick masonry (with bolts through it!) rather than the more traditional gypsum plaster. Plaster is easier to apply, definitely easier to repair, probably less technology-intensive, and actually cools the structure as it calcines in a fire. And you can easily buy gypsum with very well characterized fire resistance in both plaster and panel form today. You could of course then bury the plaster in interior masonry walls if you wanted a thicker layer around it. You could even use firebrick.

I think your brick exterior walls are gonna fall apart. It seems backwards to rule out any and all organic polymers, but then to be willing to rely on having somebody regularly maintaining the wall. Somewhere in your 1000 years, there's almost certainly to be a 100 year period of nearly total neglect. You don't seem to be treating cost as important, so maybe interlocking masonry that would hold together even if it didn't have mortar? Would stone or something be better than brick?

You could stick a superficial insulation layer on the outside of the wall where it belongs. It will fail, and need to be replaced, but you can probably design the wall to be more or less OK with or without the insulation in place. The insulation won't be pretty, but if future people demand pretty, then they can rip the insulation off and use the base wall. You'll meet energy efficiency standards now, and reduce wear and tear for a while, and it may be easier to survive if the power goes out.

If you build the house in an urban area and expect the area to stay urban, where are you going to be getting the wood for those fireplaces? Fireplaces only work as a "collapse of civilization" alternative if you have a large dedicated woodlot. And chimneys have their own problems. Oh, and new fireplaces are ILLEGAL to build in the urban area where I live, and I imagine in others too, and for very good reasons. Can you come up with passive design elements that will keep the building more or less habitable even with no heat at all?

I'm also unsure about urban locations in general; they tend to get redeveloped.

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