Follow the water through the transition
At a roof-wall intersection, flashing needs to connect with both the roof covering and the wall’s water-management layers. PNNL’s guidance describes step and kick-out flashing that directs water along the intersection and away from the wall into the gutter.
A visible bead of sealant does not explain what lies behind the cladding or how the layers connect. Ask the contractor to show the proposed detail and identify any adjacent finish that must be opened for access.
Identify each penetration and its responsibility
List the vents, pipes, skylights, equipment curbs and other components that interrupt the roof. A roof-material manufacturer may have specific details for these interfaces. Rooftop equipment can also have its own enclosure or service defects, so the investigation should not assume the membrane is the only possible source.
For a leak complaint, provide its interior location and timing. Ask whether the report distinguishes roof flashing from equipment, wall or plumbing conditions that require another trade.
Specify reuse and replacement deliberately
Ask which existing flashings will be replaced, retained or exposed for evaluation. Reuse should be explained in terms of condition and compatibility; replacement should include the adjacent work needed to make the connection effective. Neither “reuse everything” nor “replace everything” explains a complete scope.
- Name the affected transitions and penetrations.
- Identify the proposed detail and compatible materials.
- State whether wall cladding, masonry or equipment work is included.
- Record concealed conditions before closing the detail.
- Assign responsibility for new penetrations added after the roof is finished.
Keep temporary leak control separate
Temporary sealing may help a responder protect an affected area, but the permanent scope should address the failed detail and its water path. If sealant has been reapplied repeatedly, ask what investigation will establish the underlying cause before another repair is authorized.