How we coordinate deck, parapets, reglets, drains and membrane on Oklahoma tilt-up buildings so the roof is dry, warrantable and ready for the next trade.
Roofs and tilt-up walls are built by different trades at different times, and the places where they meet are where most leaks, delays and finger-pointing begin. The top of a tilt-up panel is also the parapet, the counterflashing line and the edge the roofing membrane has to terminate against. If the reglet is in the wrong place or the parapet is a few inches too short, the roofer has to improvise, and improvisation at a roof edge rarely ages well.
Roof system coordination is the work of lining up the structural roof, the insulation, the membrane and the wall panels so each trade finds what it expects. It starts in design, with drains, slope, penetrations and parapet heights, and it continues through the shop drawing review, the deck inspection and the roofer's first day. We do it as the builder of the walls and the roof frame, so the people setting the structure know what the next trade needs.
For an owner the payoff is a dry building, a roof warranty that is issued without argument and fewer repairs in the first few years. The sections below explain what we coordinate, in what order, and what Oklahoma conditions add to the picture.
The Oklahoma Construction Industries Board states that general contractors are not required to hold a state license, but roofing is among the trades that require licensing or registration for those who perform or offer to perform the work. That means the roofing contractor on your building should hold the credentials the state requires, and we ask for them before the roofing subcontract is signed. Our permitting and inspections work keeps those credentials on file with the rest of the job paperwork.
The building code edition affects wind uplift design and fire classification, and it varies by city, with many still listing editions while the state has adopted the International Codes. Roof manufacturers also set their own conditions for warranty: approved applicators, deck conditions, fastener patterns and inspection steps. We gather those requirements at the start and build them into the schedule.
The panel top is the key detail. Panels usually rise above the deck to form a parapet, and the height, the thickness at the top and the placement of reglets or blockouts for counterflashing are all set on the panel drawings. Roof drains and scuppers pass through the panel or the deck, and overflow openings have to be placed to the plumber's dimensions, not guessed.
On the roof side, we coordinate deck slope, tapered insulation layouts, curbs for rooftop units and penetrations for vents, drains and conduit. We check that the framed openings in the deck match the mechanical drawings, since a curb moved after deck is laid is expensive. Roof access is the other item, because ladders, hatches and guardrail posts near the parapet need blocking or framing that has to be in place before the membrane.
Mixed-use shells such as a flex office-warehouse building add a wrinkle: the office bay may have a different roof height, a different drain layout and more rooftop equipment than the warehouse bays, so the roof plan has to be coordinated by zone rather than as one surface. All of it begins with the structural package described in joist and roof deck framing.
Roofing waits for deck, deck waits for joists, and joists wait for the walls to be braced and connected. A realistic schedule shows that chain and the dates on which each link is expected to finish. The dry-in date is the one most owners care about, because it is the day interior trades can begin and the building is protected from rain.
We schedule the deck inspection before insulation is delivered, because roofers need a clean, dry, properly fastened deck. Insulation and membrane then follow in bays, so that exposed insulation is covered the same day. Weather again plays a role, as described in weather and schedule planning, since roofing cannot proceed in rain or high wind.
Oklahoma roofs get tested. Records show that about 150 tornadoes have struck within Oklahoma City limits, thirteen of them violent, and the 1999 outbreak destroyed a 53-store outlet center and a foodservice distribution center in Stroud, according to a report on the town. Those events are far beyond ordinary design wind, but they are reasons owners ask about uplift ratings, edge metal and fastening.
The roof edge, corners and parapets see the highest uplift, and many roof manufacturers require extra fastening or adhesive there. We make sure the edge metal is attached according to the roof system's requirements and that the roofer and the structural engineer agree on the details. The same attention goes to flashing at panel joints, which is where wind-driven rain can enter.
The membrane is only part of the number. Insulation thickness, tapered layouts, curbs, edge metal, walkway pads, drains and roof hatches all add cost, and so does the warranty tier. A larger building also means more roof area and more perimeter, which increases detail work.
Deciding early where the rooftop equipment goes and how the roof will drain avoids cost later. For industrial developers and REITs who build for an unknown tenant, we suggest a flexible curb and framing plan that can handle equipment changes without a rework. In Oklahoma City and other metros, we also price drain and overflow details according to the local plumbing requirements.
Send us the roof plan and panel elevations and we will mark the parapet, drain and curb conflicts we usually find, so they are corrected on paper.
The roofing subcontractor installs and warrants the membrane system, while we are responsible for the structure and the coordination of the wall and deck details. If the contract includes the roof, we manage the roofer and the manufacturer's inspection. We make sure the deck and parapet are ready for roofing.
No, but the roof has to be detailed to the wall, including the parapet, reglet and drains. Membrane roofs over steel deck are common on tilt-up buildings. The design team selects the system based on slope, equipment and owner preference.
Coordinate the parapet height, reglet position and counterflashing on the shop drawings, then check them in the field before roofing starts. Leaks at the edge usually come from details that were not coordinated. We inspect the edge before the membrane goes on.
Often yes, if the design has accounted for the added load and the roofer approves the attachment method. Oklahoma has strong renewable energy generation overall, but it is the engineer's call whether your roof can carry panels. Raising the question during design costs little.
Send the site, the building, the schedule and the decision you need to make, and we will set up a project review.
