Start with drainage and the roof assembly
Ask the contractor to identify the existing membrane, insulation, deck, drainage routes, and edge details. A low-slope roof proposal should explain how water reaches drains or scuppers and how the new work connects to walls and penetrations.
Compare a localized repair with replacement
Request the findings that support a seam repair, flashing replacement, or a new membrane. If moisture testing is proposed, ask what area it covers and how the results will change the scope. An isolated repair and a replacement should have distinct scopes and warranties.
Coordinate shared buildings and additions
For a Pearl District condominium, establish who authorizes the roof work and how contractors will access shared areas. For a low-slope addition in the Alberta Arts District, ask about the junction with the main roof and the wall above it.
Check the building classification
Ask the permitting office which rules apply to the building and proposed work. Do not classify a building from its roof material or number of stories alone. Use the permit planning guide to prepare that conversation and the commercial roofing guide for questions about project coordination.
Choose a contractor for the scope
Before signing, check the Oregon CCB license and compare the written scope, payment schedule, and warranty. You can request a roofing referral through this site; confirm the contractor’s credentials and availability before hiring.