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View Full Version : How much rubber footing for new outdoor?



keatssu
May. 29, 2012, 10:20 AM
As the time to put footing in our arena is approaching I'm getting nervous about screwing it up! I've decided to mix crumb rubber with mortar sand because the washed concrete sand in my area has too many pebbles. This quarry sells the washed mortar for arenas. I think it's a little too fine to be used alone.
"Under Foot" recommends starting with 1 1/2 - 2" of footing. I'll be using the arena for jumping. I was thinking 1" of sand and 1/2" rubber to start.
Any advice?

In the Air
May. 29, 2012, 04:23 PM
Make sure the type of sand you use is rough so that does not migrate easily...

Hpilot
May. 29, 2012, 04:32 PM
Not sure what washed mortar sand is....is it the same as just plain mortar sand that is supposed to be mixed with concrete? I bought that kind to put in my indoor along with the rubber, on the advice of a dressage trainer. What a mistake. It was like riding on marbles on top of marbles. Actually had a clinician here that was riding his horse and the horse slipped and fell on him. It was awful.

pds
May. 29, 2012, 05:27 PM
I agree with Hpilot. imo, mortar sand is way to fine a grain and even with the crumb rubber added would be unstable.

You may find this helpful.
http://pubs.cas.psu.edu/freepubs/pdfs/ub038.pdf


"Particles need some angularity to
offer resistance to movement between
them. Round particles would appear
to offer the biggest void space between adjacent particles, thus being
less compactable. But a footing primarily composed of round particles
is not suitable since there is too little
stability between particles. Picture a
giant-scale footing composed of ball
bearings or marbles. Beach and river
sand have rounded particles through
the wear of water action that has removed most angular corners."

"Certain specifi cations of sand are
required for good footing material.
Riding arena surfaces should contain
cleaned and screened, medium to
coarse, hard, sharp sand. Fine sand
will break down more readily into
small enough particles to be lofted
as dust. “Cleaned” means the material has been washed of silt and clay,
making the sand less compactable
and less dusty. “Screened” means
large, undesirable particles have been
removed and a more uniform-sized
material remains that will
be less prone to compaction. “Hard” is quartz sand,
which will last up to 10
years. Obtained from a
quarry, subangular sand
has sharp particles, versus the rounded particles
found in river sand. The
subangular particles of
naturally occurring, mined
materials are old deposits
of sand that have weathered from natural forces
of water (typically) into
particles that are still angular for stability as an arena
sur face. Manufactured sand is very fi ne, crushed rock and is
also angular, but not as hard as real
sand. Angular sand provides better
stability than rounded sand particles,
which behave similar to millions of
ball bearings underfoot."

Dalemma
May. 30, 2012, 10:45 AM
We have hydro sand......it has varying sizes of particles from fine sand to small pebbles that are of different sizes and shapes....it provides enough cushion with out allowing the horse to sink to deep.......my dressage teacher says its one of the best footings she's ridden in.

Dalemma