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So, how should windows be installed? There are different opinions on this process, but most window manufacturers agree on these principles. 
Below is an image of what we call pan flashing.
This is done with a product made by several companies, most commonly called window wrap. It is a bitumen product which is a rubberized, extremely sticky product that is placed on the bottom window opening, and runs up each side 8 inches to meet code. As you can see, this is placed over the house wrap we discussed in a previous chapter. 

The next image depicts the aluminum piece (flashing) on top of the window, which moves water that hits the structure above the window and moves it away from the home. You will notice that the house wrap has been moved up and away to allow this flash...