我需要在受霜保护的浅地基下进行绝缘吗?

你说得对，从平板外部边缘或底部逸出的热量有助于防止霜冻，而且你越隔热，逸出的热量就越少，从而增加了损坏的风险。而减少这种风险的方法是安装一个周边裙绝缘(在需要的地方和时间)。这正是我们建造石板的方式，所以我们依靠隔热层来保护建筑免受冻伤，而不是依靠持续的热量损失。There are a couple of pages that I think will help you a lot, first this one -

How Much Insulation Does a Basement Floor Need?

And here is a page aboutslab on grade premade form kits, this is by a company called Legalett that provides slab on grade kits that mean you can stop scratching a hole in your head figuring insulation levels, they do it all for you. We just built one ourselves, here is aslab on grade DIY installation video so you can see how quick and easy it goes together.

Further to that, there are a few variables at play that need to be considered when designing the slab to ensure durability: The AFI (air freeze index), how much insulation encases the slab, the soil conditions, and whether or not the slab will be heated. The best way to ensure that a FPSF (Frost-protected shallow foundation or slab-on-grade) doesn’t heave would be to have it modelled for your specific climate by an engineer, ideally a geotechnical engineer.

In general terms and as a point of reference only - our experience with slabs in Canada is that R20 like you describe is not extreme, nor does it always require a skirt. But without the benefit of a proper climate analysis we cannot make any design recommends for you, and without such information I would for sure take the safe route and install a skirt.

至于你选择的绝缘材料，为什么是XPS(挤压聚苯乙烯)?EPS(膨胀聚苯乙烯)在制造过程中对温室气体排放的危害要小得多，而且价格大约是它的一半。XPS每英寸有更高的R值(R5)，但空间不会是一个问题，因为你是在等级上建造，所以我建议你节省一些钱和排放，使用EPS(每英寸R4)。每美元的R值会高得多。Here you can see our page abouthow to choose the best rigid insulation board.

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