The contractor is in the final steps of finishing the overhaul of my outdoor dressage arena. I’m so excited! We added french drains and a little slope to the base and built up my low spots. 200 tons of stonedust later, I need to pick a footing. I think the fibers are outside of the budget right now, so I just want a good sand that is not too shifty but that will still drain.
Underfoot booklet seems to recommend mason sand slightly ahead of concrete sand. I have concrete sand in my indoor and it is a touch shifty if it gets even a hair too deep. However, the mason sand seems so fine. Contractor (who has done multiple arenas lately) is saying that he has been adding a small truckload of topsoil to sand footings to give them a bit more binding action, so they ride well from day one.