"Trying to Help" wrote in message
oups.com...

The question I have is, why would the
shingles automatically laminate to one another, just because they're
softer (due to heat)?

Under the lip of the shingle the manufacturer runs a tar strip. When you
get a nice warm day the tar softens and bonds to the granuals un the shingle
below.



And once they're laminated, what prevents them
from curling up in the winter?


The base material of the shingle is asphault impregnated fiberglass. When
this heats up, it softens and sticks together so that when it again gets
cold the tendancy to curl is imparts less force than the stickum so it stays
stuck. When applied in cold weather, the memory of the shingle is what it
was in the bundle so they act independantly.

If the roofer was not worried, you should be fine. He is the guy that is
going to get called a 3:00 A.M if your roof starts to leak and would have to
make good any damage.


--

Roger Shoaf

About the time I had mastered getting the toothpaste back in the tube, then
they come up with this striped stuff.