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I think the purpose is to make money for a vendor. I have layed two patios, one in northern IL ( freezing) and one in east TX ( no freezing but average 50" annual rain). I layed them both on the native soil which were both very sandy. No problems, I admit the sandy soil may have been a help.


8

It mainly serves two functions: The density of the in-situ soil usually is uneven (due to voids) throughout the site, and difficult, if not impossible, to compact to the desired strength (eliminate/minimize the void spaces) to avoid uneven settlement that would lead to structural cracks. A 6" course of gravel fill solves that problem, as it is more ...


2

How about cutting the blocks in the base course? Use a full 8" high block at the low end and trim each successive block 5/16" more working your way to the high end of the project. Trimming the blocks exactly to height isn't super critical; so long as they're within say 1/2" of the needed height the mortar bed beneath the block should fairly ...


1

It looks like the different surfaces were made that way by an amateur. So, not a matter of deterioration except for the rotting wood. Concrete with rough aggregate was poured , then at the "right" time , a stiff broom was used to sweep cement and fines from the surface leaving the aggregate. Appearance depends a lot on timing and broom action. The ...


1

To answer your original question, I would guess that a .006 would not work with a mid-level pressure system. It appears that the smallest size would be .012" for the mid-level pressure system. This write-up for a .008 orifice (which is larger) states that it should not be used with pressure below 250 psi. So the .006 would definitely need a high-...


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