MRCMETAL ROOF
CONTRACTORS.CA
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System guide

Flashings and drainage interfaces

Roof edges, walls, valleys and penetrations need coordinated detailing.

Flashings and drainage interfaces — building concept
This roofed home concept provides the building context for the decisions in this guide. Source: AI-generated Lovable project imagery; not a completed customer project.

Understand the system

Roof edges, walls, valleys and penetrations need coordinated detailing. These connections deserve as much attention as the panel choice.

What to discuss

Identify chimneys, skylights, service penetrations, adjacent walls and gutters in the project brief. Ask who designs, supplies and installs each interface and how it relates to the roof manufacturer’s details.

Build a clear scope

A proposal should describe the finished drainage arrangement and any retained components. Use site-specific design and product guidance; a generic image cannot establish flashing dimensions or suitability.

Before selecting a contractor

Request the product documentation, a relevant scope, evidence of applicable qualifications and current coverage, and references you can check. Installation methods and warranty terms must be confirmed for the proposed project.

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