ChetT, I would guess in Maine the code recommends R-30 for floors. That would take some thick insulation board. The way Ac is doing his is definitely one of the best ways to do this. Using a small air gap to take advantage of a radiant barrier and foam sealing the panels for a super tight fit is the way to go. Clearly its labor intensive and depending on you crawlspace height and goals for the farmhouse you might want to streamline. My 1st thought on the 8x4 sheets, it depends how big your crawl hatch is, most are tiny when you start dragging materials through it. For speed and a general improvement over no insulation I would recommend stuffing the floor with batts that fit you floor joist thickness and cover with insulation board and tape the seams. There are "fan fold" insulation panels, I've only seen 1/4", they unfold to 8x4 dimensions. Although thin, you could gain the benefit of the air sealing with less seams and tape joints
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