THE VALLEY IS BY FAR THE WORSE PLACE TO HAVE A LEAK.  

AFTER A ROOF IS INSTALLED, IF THEY DID NOT INSTALL ICE&WATER SHIELD

SOMETIME IN THE FUTURE THIS WILL BE A PROBLEM.  

ICE AND WATER SHIELD ADHERES TO THE DECK, MAKING IT IMPOSSIBLE FOR

WATER TO MIGRATE UNDERNEATH IT.  IT IS A THICK RUBBER LIKE MATERIAL

AND IS WHAT A ROOFER SHOULD PUT IN YOUR VALLEYS.   METAL IS THE OLD WAY AND

ICE AND WATER SHIELD IS THE UP TO DATE MATERIAL TO USE.

ICE AND WATER SHIELD