FOOTING QUESTION: Ever used 1/4" minus in footing?
After a year of redoing a botched base for my "all weather" outdoor, we are ready to add footing. Being in the PNW (although far south with less rain than the north), drainage and traction are key, and I have put down one inch of 1/4" minus (watered and lightly compacted) prior to tomorrow's two inches of course sand. I am hoping that the 1/4 minus will help prevent the horses from punching through the sand to the base. I figure that the 1/4" minus and the sand will mix a bit, which I think/hope should work well for sharp drainage.
I have heard of at least one event barn in the Portland area which uses only 1/4" minus as the sole footing...Any one with personal experience/tips? I have an arena rascal, so I can set the depth of "fluffing" very precisely. What I am paranoid about is the base. I am not totally confident that it is going to be hard enough, and I don't want the horses to punch into it.
(base is 6" of 4" rock, over geotextile cloth, compacted. Then 4-6" of Decomposed Granite, compacted) The slope is 1& 1/2%...crowned at the centerline with a 1% slope the long way from end to end.
Any advise regarding "breaking in" new arenas, or reviews of riding surfaces with some 1/4" minus in them would be much appreciated!!!