Give your new lawn at least 1 inch of water with-in 15 minutes of installation.  Water daily, or more often, keeping sod moist until it is firmly rooted (about 2 weeks).  Then less frequent and deeper watering should begin. 

Weather conditions will dictate the amount and frequency of watering.  Be certain that your new lawn has enough moisture to survive hot, dry, or windy periods.

Water areas near buildings more often where reflected heat dries the turf.