The unit probably isn't as heavy as you think and the fiberglass slab will
be fine. Check with the new unit's manufacture for their specs for the
slab. Mine is fiberglass and is doing fine after 5 yrs.


wrote in message
...
I am having the my AC system replaced and I noticed that the outside unit
sits on what seems to be a fiberglass imitation slab. Looks lik concrete
but not. I noticed my neighbor has a concrete slab under his. I am
concerned about the strength of it since it is a very large fan that is
sitting on it.

Any thoughts? Am I overly concerned?


Thanks in advance,


James