What is flashing?

We have had some comments about why there is flashing. Why cant they they simply put the vent pipe through the roof. Well, if you look at a roof deck when they build a house you will see that the roofing contractor will simply cut a square or round hole where the vent...

Why dont I see my vents leaking

We have had a few comments on the subject of leaking vents. The main question is this. If I go into my attic during a rain storm under what I know is a damaged vent, why am I not seeing any water? The answer is that the vent is likely just leaking water into the...