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P2607.1 Pipes Penetrating Roofs
Where a pipe penetrates a roof, a flashing of lead, copper, galvanized steel or an approved elastomeric material shall be installed in a manner that prevents water entry into the building. Counterflashing into the opening of pipe serving as a vent terminal shall not reduce the required internal cross-sectional area of the vent pipe to less than the internal cross-sectional area of one pipe size smaller.
P2607.2 Pipes Penetrating Exterior Walls
Where a pipe penetrates an exterior wall, a waterproof seal shall be made on the exterior of the wall by one of the following methods:
  1. A waterproof sealant applied at the joint between the wall and the pipe.
  2. A flashing of an approved elastomeric material.

Related Code Sections

Section P2607 General Plumbing Requirements, Waterproofing of Openings
that prevents water entry into the building. Counterflashing into the opening of pipe serving as a vent terminal shall not reduce the required internal ...
Section P2607 General Plumbing Requirements, Waterproofing of Openings
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1805.3 Soils and Foundations, Waterproofing
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1805.3 Soils and Foundations, Waterproofing
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