Here is how you do it.
Vent pipe shingle roof.
Roofing flashings vent pipe flashing.
Figure 2 cut shingle to fit over.
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Install shingles as normal up to the base of the plumbing vent.
The idea of roof vents existed for hundreds of years with natural vents employed in chinese buildings during the tang dynasty natural ventilation ducts in the buddhist monks caves and wind catchers incorporated in arabian architecture.
Apply the last row of shingles that is just below the vent pipe as shown in figure 1.
Figure 1 install shingles just below vent pipe.
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Adjustable pipe flashing with galvanized steel base and rubber collar.
Vent roofs with steeples towers or cupolas can be found in different buildings from barns to cathedrals.
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Use some asphalt roof cement under the cut shingle and around the vent pipe as shown in figure 2.
The building codes and building science for.
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Continue the next row of shingles cutting a hole for the vent pipe.
Momentarily lift the boot and apply sealant to hold the flashing in.