Watched a couple videso on youtube re:installing windows. Many place something under the window to slightly raise the window from sitting on the sill pan if water ever gets in and collects there.

My GC doesn't do that, says that water should never be able to get to the sill pan... that we live in Sacramento CA area, and water getting onto sill pan is in areas with driving rain storms or a lot of humidity, freezing and thawing etc...

Is this true? Just getting conflicting information from internet.

Are there any differences in installing a window in California I should know about (also installing Integrity all Ultrex if it matters)?

Also caulking the bottom nail fin of the window, my understanding is it should not be done because it will prevent any potential water from draining out the sill pan externally. Only other way out is through the wall in the house.

Any other tips, or other "must do" or make sure they "must not do".

Thanks