Define what can and cannot be observed before removal
Safe exterior views, attic access and earlier records may reveal some conditions, but large portions of the deck and flashing interfaces can remain concealed. Ask the estimator to distinguish observed facts from assumptions. Label photographs by roof plane and date, and note when an area was inaccessible. Avoid asking a pre-work inspection to guarantee the absence of hidden moisture or deterioration. The goal is to identify which uncertainties can be reduced now and which need a documented process during removal.
Create a deck-review and change process
Before tear-off, agree on the evidence required when deck material appears unsuitable. The proposal should describe how affected areas are measured, who reviews the finding, what photographs are taken and how additional work is authorized. A unit price can help, but it must identify the unit and what the price includes. Structural questions are not resolved merely by replacing a sheet of material; unusual movement, widespread damage or framing concerns may require appropriate professional input.
Map flashings by location and function
List eaves, rakes, valleys, sidewalls, headwalls, chimneys, skylights and penetrations separately. Ask whether each existing flashing will be removed, replaced, integrated or left outside the scope. A broad phrase such as 'all necessary flashing' can hide different assumptions. Where the roof meets siding, masonry or another assembly, identify who is responsible for access and reinstatement. Manufacturer details and site conditions both matter; neither should be represented as a remote guarantee of performance.
Treat penetrations as individual interfaces
Plumbing vents, exhaust outlets, skylights, roof hatches, antennas and other penetrations each interrupt the water-shedding surface. Record their location, apparent condition and whether the proposal includes replacement components or only integration with the new covering. Confirm who disconnects or reconnects equipment when another trade is needed. For an older or abandoned penetration, ask whether removal and deck infill are within scope. Photographs taken before and after work make these decisions easier to verify later.
Evaluate intake and exhaust as a connected path
Counting roof vents alone does not establish balanced airflow. The actual path can depend on soffits, attic divisions, insulation, blocking and the roof shape. Document visible intake and exhaust locations and ask for the basis of any proposed change. Keep leak evidence separate from possible condensation symptoms because the investigations may differ. If the assembly is complex or moisture damage is significant, identify the need for qualified building-envelope, mechanical or other professional review rather than assuming a standard vent product is the answer.
Follow drainage through low-slope and edge conditions
Water must reach an effective discharge route. On low-slope areas, identify drains, scuppers, overflows, parapets and transitions to adjacent steep roofs. On sloped roofs, note gutters, valleys, diverters and wall intersections. Ponding, staining or overflow evidence belongs in the scope record, but cause and remedy require on-site assessment. Clarify whether gutter removal, replacement or reinstallation is included and who addresses downstream drainage components that sit beyond the roof contract.
Capture concealed evidence before it disappears
Set checkpoints for deck, underlayment, valleys, wall transitions, penetrations and ventilation components while they remain visible. Photographs should be dated or otherwise tied to the job record and labelled by location. They are most useful when paired with approved changes and final product information. At closeout, compare the evidence list with the original scope and record any approved departures. The result is a practical maintenance file rather than a gallery of unlabelled construction images.