On 1-Jan-2006, "Rob" wrote:

I've read in a news group that a
pier support weight 5 linear feet from the center of the pier.

How much weight? Just because the span can be up to five
feet doesn't mean that it can support all possible loads over
that span. As well, the limit might not be the pier but the capacity
of your house foundation. Even if the piers can hold the load at
ten foot spacings, your house might require closer spacing unless
you want to heavily reinforce the house.

Mike