Parking Structure Roofing in Oklahoma City, OK.

Ask: what traffic-bearing membrane systems are you certified to install, and can you provide the manufacturer certification letter? What is your pre-bid inspection process for a parking deck — specifically, how do you assess concrete condition before pricing? Can you provide three references for parking deck projects completed in the last 3 years with the contact name and number of the facility manager? What ASTM standards govern the system you're proposing? A contractor who can answer all four questions without hesitation has done this work before.

A complete parking deck proposal should include: scope of work by deck level and zone, concrete repair unit pricing with a defined allowance and a unit cost for additional repairs discovered during construction, membrane system specification with manufacturer product data sheets, installation method (broadcast aggregate density, number of coats, minimum dry film thickness), warranty terms and manufacturer certification documentation, phasing plan with operational impact per phase, ADA slip resistance compliance documentation plan, and project closeout deliverables list. Proposals that list only square footage and a lump sum price are incomplete.

Concrete repair scope on parking decks is inherently variable — the pre-bid inspection gives a reasonable estimate, but the actual extent of delamination is only fully visible once the membrane is removed. The correct contract structure includes a defined concrete repair allowance (based on the pre-bid assessment) and a unit price for additional repairs beyond the allowance. The unit price is agreed before award so there are no disputes when additional repair scope is discovered. Lump-sum concrete repair pricing in a parking deck proposal is either dramatically over-estimating or gambling on the extent of hidden damage.

Require both a contractor workmanship warranty and a manufacturer system warranty. The contractor workmanship warranty should cover installation defects for a minimum of 2 years. The manufacturer system warranty should be 10-15 years minimum, registered to the property owner, and NDL (no dollar limit) in coverage. Verify that the contractor is certified by the named manufacturer before accepting the warranty. A warranty issued by an uncertified contractor is not backed by the manufacturer — it's backed only by the contractor's financial capacity to pay a claim.

Normalize bids to apples-to-apples before comparing prices. Confirm that each bid specifies the same membrane system type and thickness, the same concrete repair unit pricing structure, the same warranty terms, and the same scope of work (same deck levels, same drain and joint scope). Price differences of 15-20% between bidders on an identical scope are a red flag — usually indicating a different (and lower-performing) membrane specification, missing concrete repair scope, or an uncertified installation that forfeits manufacturer warranty. The bid that looks cheapest on paper often costs more at closeout.