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Most of us live in stick built homes. Wood, cut into rectangular boards or sticks are used, most often at a standard distance from one another to create a frame. Within this frame are holes that are later filled with windows or doors and in places that are eventually covered with siding (outside) and drywall or plaster (inside), it leaves a voids the thickness of the sticks that get filled with insulation. Most of these types of buildings are built upon a deck of some sort which becomes the floor of the finished space. The most common area to be forgotten, especially by insulators is the space directly under the floor. Often, it is just what is referred to as the rim joist. Often a single wide board, set on edge, holding all the floor members (joists) together. The structure that is made of the intersection of rim joists and the floor joists is often called the sill box, because the end of the floor, above the foundation looks like a series of small boxes along one wall of the basement, or foundation and the opposite wall the two walls going the other direction may just have a single, or in some cases a double joist to supprt the rest of the floor deck.This area, especially if forgotten in an otherwise insulated home can account for up to thirty percent of the heat loss in the entire structure and it causes floors to be permanently cold in winter and it even wastes the expensive cooled air in an air conditioned space in summer. some people like to spray foam insulation into that area but unless you take your time, to make sure all the gaps are filled completely and work slow enough to build up a thick layer of spray foam, this may not be the best approach. A more time consuming but also more reliable way to make sure adequate thickness of insulation gets put around this area is to use rigid foam, which can be cut to the proper size and wedged into the space.