Five years after Parker Johnson installed new roofs on all 25 condo units in my parents' strata complex, a number of roofs are now warping and leaking. They've discovered that the company used 1.5" nails instead of the standard 2.5" nails. Parker Johnson won't take any responsibility for this.
The money spent on high quality shingles with a 25-year warranty was a waste, unfortunately. Now the owners have to come up with new funds to get the job done again!