Patio - mason sand for subbase issues?
Mason sand cnnot be conpacted in the way most base materials are. When it is damp, it may look compacted, but when it gets dry or wetter it becomes unstable and it can be expected to allow movement.
The installation steps I listed were generalized from the more technical standards that are on the web site for the Interlocking Concrete Paver Institute (ICPI) at icpi.org (I think). These can be relazed a little bit for a patio, but not for a street or a parking lot.
Unfortunately the term "concrete sand" and "mason sand" are variable and regional and they actually overlap in most technical standards. - To answer youe question quickly, mason sand is not an appropriate base.
The only place I would use mason sand would be to spread lightly over the set pavers is because the fineness allows it to be vibrated into the tight joints.
Last edited by concretemasonry; 09-02-2011 at 03:42 PM.