In the past, when laying brick walks, I used only washed sand as a base material. I would excavate 4" to 8" and fill with sand, tamping as I went. Screed a final layer then set the bricks and wash sand in after. These were all clay brick applications in residential settings. Most still look very nice, several years later. I am getting ready to install a paver walkway in a more commercial setting and I would like to make sure that the installation will hold up to heavier traffic. I've read the installation guide from the paver mfg (Belgard) as well as many of the treads posted here. I have a few questions that I'd like to verify however. First, what is the purpose of the base layer or foundation layer? If I'm looking for a solid compact base layer to set the installation on (the Belgard guide mentions applications that are on concrete slabs), I would think that I could use crusher or stone dust as the base layer in stead of crushed stone and then washed sand as my setting bed? It seems that the crusher dust would level out and be easier to work with than crushed stone would? Second, is a geotextile layer necessary in all situations. If the subsoil is well compacted, gravely or sandy and in an area that is not prone to moisture buildup, can it be eliminated? Third, what is your experience with the durability with pavers as far as winter de-icing damage. I plan to apply a sealer to the pavers which, according to the mfg, will protect them from salt damage. Is this your experience??