On Tue, 05 Apr 2011 09:55:26 -0700, chaniarts wrote:
does it occur when the temps are going up or down? if so, it's
expansion/contraction.

It might also be plastic gutters expanding/contracting if they haven't
been installed properly - they can make quite a noise, too.

Given that the OP's in Florida, I suppose we can rule out snow/ice
falling from the roof