The lead flashing is the first picture.
Pipe sticking out of roof.
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It actually slips over the pvc pipe and then the lip of the flashing curls over the pvc pipe.
Without that vent and there s one connected to every drain in your house the water leaving your sinks showers and toilets would slow and hiccup and not have smooth operation.
There are pipe boots installed on plumbing vent pipes that penetrate through roofs.
They re those pipes sticking up out of the roof that run through the attic and through the rest of the house.
This is true whether the roof is sloped or flat but the type of pipe boot depends on the type of roof.
All residential plumbing fixtures need to be protected by a plumbing vent.
The hole in the roof where the vent pipe penetrates is usually weatherproofed with a jacket made of lead called a boot the malleable lead is bent over the pipe rim at the top and slipped under the roofing at the base.
They fit loosely usually thats why it seems like they aren t.
Those white plastic pvc pipes jutting out of your roof have little to do with your roof and a lot to do with your home s plumbing system.