Subgrade
Sub base
Base
underlayer,
COMPONENTS OF FLOOR
When you look at your floors, you may only think of the one layer that you see. Like the ground you stand on, there are several layers underneath the top one that ensures the stability and function of your floor.
American Concrete Institute's defines, Subgrade as the native soil (or improved soil), usually compacted and Sub base is a layer of gravel on top of the subgrade. A solid subbase is a key to a successful building project. ... A subgrade is made up of native soil that has been compacted to withstand the loads above it.
Joists
At the very bottom of the layers that make up your floors is what we call joists. Think of these as the bones of your flooring. They are used to frame the layer that will sit upon your home’s foundation. It’s crucial that joists are installed correctly because if not, it will result in a great deal of noise, squeaking, and shifting when you walk on your floors.
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