Flat roofing. Plan the water's way out.

Start with a labeled roof plan instead of a single total area. Mark walls, curbs, drains, scuppers and changes in level. Record the location and date of observed standing water, debris or staining without turning those observations into an unverified diagnosis. Interior leak locations belong on a related plan because the point where water appears inside may not identify the roof entry point.

Ask which elevations or further investigation are needed before a drainage change can be designed. Distinguish existing conditions that remain from conditions the proposed work is intended to change. If the scope includes new drains, overflow work or plumbing changes, name the responsible trade or designer. A membrane replacement and a drainage redesign should be visible as different items in the proposal.

Tapered insulation changes thickness across an area to help form a designed drainage path; it does not simply add the same height everywhere. The resulting elevations interact with the existing deck slope, drain locations and obstructions. Request a layout identifying its high and low points and the interface with retained roof zones. Keep the proposed slope strategy separate from measured existing slope, and ask how layout revisions affect quantities and details.

The board product, thicknesses and thermal-property basis belong in the submittal record. Do not assume one nominal thickness describes a tapered assembly everywhere. Clarify how the applicable thermal requirement is evaluated for this project and who confirms it. Check the proposed height at drains, walls and equipment curbs so that a thermal decision does not leave an undocumented flashing or access change.

Ask the assessor to distinguish a visual observation, an instrument indication and a confirmed condition. Retain the survey date, conditions, mapped locations and interpretation. A colored survey image without those details is difficult to compare against a repair boundary. If an opening is needed to identify the assembly or verify a concern, record authorization, sample location and restoration responsibility.

Use the resulting evidence to discuss the extent of affected material and what remains uncertain. The proposal should identify any further investigation and the process for additional findings after removal. Do not translate a limited sample into a guarantee that every concealed area is dry or sound. A useful report makes uncertainty manageable by showing where the evidence ends and which next decision it supports.

A new membrane can meet an existing drain assembly with parts or conditions that need further review. List drain locations and identify which components are included, retained or assigned to another trade. State whether access below the roof is needed and who coordinates it. Do not let roof-side detailing imply that concealed plumbing has been assessed when it has not.

For a proposed drainage change, connect the roof detail to any required plumbing or design documents and the authority’s review path. Record work around occupied areas below the connection. At closeout, keep photographs while the interface is visible and identify unresolved service items. This creates a clear responsibility boundary without inventing a universal drain size, overflow arrangement or inspection requirement.

Identify roof hatches, ladders, doors and regular routes to equipment. Ask which paths need compatible protection and where traffic could interfere with drainage or details. A walkway product is not a substitute for a complete fall-protection or access plan. Keep any separate safety-design responsibility clear, particularly when multiple trades use the roof during and after the work.

Build the maintenance record around the same roof-area labels used in the project. Include discharge points, equipment locations, repairs and a place to log future observations. Request the installed-system maintenance information and the applicable contact process. If another contractor later adds equipment or makes a penetration, keep the resulting detail and coverage questions with that roof record rather than treating the visit as unrelated to the roofing.