01Number the complete roof map
Give every roof plane, valley, ridge, hip, wall, eave, gutter, downspout, lower roof and penetration a unique identifier. Use the same identifiers on photographs, proposal drawings, clarification notes and closeout records. Add slope and dimensions only when measured or taken from reliable documents. A shared map lets different proposers address the same geometry and makes it easier to see when a price omits a transition or assumes a standard detail where the building is not standard.
- Use one reference plan
- Separate measured and approximate data
- Update the map after changes
02Trace concentrated water from high point to outlet
Follow each plane to valleys, walls, eaves, gutters, scuppers, downspouts or lower roofs. Mark upper-to-lower discharges, short valleys, dead-end conditions and places where debris collects. Ask how the proposed panel and underlayment details manage those paths and how temporary drainage works during construction. Do not call a detail adequate from a sketch alone; require project-specific dimensions, compatible materials and review appropriate to the roof.
- Map every discharge
- Show overflow-sensitive areas
- Coordinate gutter and flashing scope
03Identify snow- and ice-consequence zones
Record entrances, walkways, decks, driveways, neighbouring property, landscaping and mechanical equipment below sloped metal surfaces. Include routes used for emergency access or routine servicing. The map identifies consequences; it does not calculate snow load or prescribe retention. Ask the appropriate designer to connect any snow-management approach to roof geometry, expected loading, panel system, attachment and areas below, including effects on drainage and maintenance access.
- Mark occupied areas below
- Include future equipment
- Keep load decisions qualified
04Treat snow retention as a coordinated system
If a proposal includes guards, rails or another retention approach, require the exact product, layout, attachment and design basis. Confirm compatibility with the selected panel and whether attachment penetrates or clamps to the system. Record who is responsible for design and what roof information was used. A device placed only above a doorway may shift loads or snow movement elsewhere, so review the complete roof and consequences rather than one accessory location.
- Name the product
- Show attachment
- Document design responsibility
05Schedule penetrations, edges and interfaces
List plumbing vents, chimneys, skylights, curbs, antennas and planned solar supports by roof area. Add eaves, rakes, walls, ridges and gutters. For each location, compare opening dimensions, curb height, flashing sequence, underlayment continuity, movement, compatible materials and responsible trade. Require current system details or a reviewed custom detail. Photographs before closures and trim conceal the work give the owner a useful record for later maintenance.
- Assign a detail number
- Identify responsible trades
- Retain concealed-work photographs
06Plan construction weather protection
A replacement project temporarily removes part of the water-shedding system. Ask how much roof can be opened, how materials and interiors are protected, how changing weather is monitored and what dry-in condition is expected at the end of each day. Define notification and response if water enters during work. Weather procedures belong in the scope and schedule; they should not be an unwritten assumption or confused with a guarantee against every event.
- Set dry-in expectations
- Protect occupied areas
- Document incident response
07Publish a critical-detail and maintenance register
For every numbered location, record the accepted detail, product references, trade interface, inspection point and closeout photograph. Add safe future access assumptions, debris zones, gutter cleaning, sealant or fastener observations and manufacturer maintenance instructions. Keep snow-related design documents with the roof record. The register should follow the installed geometry and should not promise that leakage, ice or snow movement can never occur; it provides a traceable basis for inspection and service decisions.
- Index records by location
- Attach final documents
- Separate safe maintenance from unsafe roof access