Commercial Roofing
A ceiling stain under a finished array can take weeks to trace, because water on that roof travels along footings and conduit before it drips. Panels are drawn across a roof plan as neat rectangles, but nobody sees the membrane under them once they are bolted down. A roof that will carry an array for the array's whole life needs to stay dry for the same span, and in Edinburg, TX it spends those years under a long heat season, tropical wind and heavy rain.
Solar-ready roofing means two things: bringing a roof to the condition where panels can go on without cutting its life short, and keeping a roof workable after they arrive. We start by asking what the membrane, insulation and deck will look like years into the array's life, since the answer sets the order of the work.
Mounting panels on a membrane that is nearly finished is the classic mistake. Removing an array to reroof means an electrical shutdown, careful removal, storage and a reset, all while the roof beneath may be wet or worn out. A walk before any contract tells the owner whether membrane, insulation and deck can serve another full life.
Seams, ponding, flashings and moisture all get checked, and the infrared moisture survey is used where the surface permits. The hot months, May to October, are hard on a roof surface, so we also read how it has aged under sun: chalking, crazing, shrinkage at walls. If the roof is near the close of its life, a replacement ahead of the panels is the better order, with added insulation or a cover board for the array to rest on.
Gusts of 50 to 70 mph from Hurricane Dolly reached populated Hidalgo County, and in July 2020 Hurricane Hanna delivered wind and flooding to Edinburg. An array catches wind like a sail, and its attachment decides where that load goes. Ballasted systems sit on the surface under their own weight with no holes in the membrane, though the weight and any slipping need protection pads and a structure able to carry them. Mounted systems are fastened through the membrane into the deck, which holds firmly and puts a penetration at every footing.
Every mount that passes through the roof has to be flashed to the manufacturer's detail and placed where water will not collect on its high side. Wind design of the array belongs to the engineer, but if we find a weak deck, perimeter or edge before design, we tell the owner. After a tropical event we inspect wind damage at the array edges, where loads are highest.
NWS records large hail over the McAllen-Edinburg-Mission-Pharr metro in spring 2012 but calls such hail non-routine for the Valley. Panels carry impact ratings and roofs vary. The roof under an array can be struck too, and the array makes inspection harder, because the membrane below cannot be seen from above.
After a hail report we look at the open field first, then the array edges, then, where access permits, the lanes between rows. A hail damage repair record shows what was hit and what was not. When a section under panels is in question, the panel owner and installer disconnect and lift a row so we can see the membrane, and that cost is easier to bear when the roof record already documents its condition before the storm.
Heat is the other long-term load. Under panels the roof sits in shade for much of the day and in reflected heat for the rest, and membranes beneath arrays age differently from open field: cooler under the panel, hotter at the edge and in the gaps. We record both conditions during inspection, because the pattern of wear across the roof tells us where an array has helped the sheet and where it has stressed it.
Conductors run from the panels to inverters and a disconnect, often over the roof and through it, and the path has to get through the membrane at some point. Conduit resting straight on the sheet wears it under each strap and holds debris against it. A support that lifts the run clear carries the weight; a curb with proper flashing carries the penetration into the building.
Before work starts we settle routes with the solar installer: one entry point, flashed properly, and conduit held off the surface. An inverter or combiner box needs its own pad, which we treat as a small equipment support with protection beneath and flashing around each fastener. Conduit in a hot climate expands, so long runs are given room to move.
Plenty of roofs carry arrays today and the membrane keeps aging beneath them. Leaks under panels are hard to follow because water runs along footings, and repair happens in narrow lanes between rows. Small repairs can be made through the gaps, with the panel owner handling any disconnect. Larger jobs mean lifting, parking and resetting a block of panels, scheduled with an electrician on the roof.
That cost is why early detection pays. A commercial roof inspection that includes footings, wiring runs and the drains between rows catches a defect while a spot repair is still enough. The roof record lists the safe walking lanes, the rows that block access and which drains sit between rows and how a crew reaches them.
The city's economic development group points to distribution and warehousing among local employers and lists healthcare, higher education, government, food processing and manufacturing in the employment base. Large low-slope roofs are natural array sites, but a building's use does not reveal its roof type or age. Edinburg's adopted codes, the 2018 IBC and IECC, come into play when a roof is altered for an array, and we check which provisions apply.
For owners along the I-69C and US 281 corridor in Edinburg, or in McAllen and Mission, we write a roof condition report before the solar contractor lays out rows. It lists what the array will rest on, which sections are sound, which need repair first and where drains and penetrations limit the layout.
The terms of the roof's own warranty answer that, since manufacturers treat penetrations and foot traffic differently. We read it before the array is laid out and flash every mount to the manufacturer's detail.
Yes, when the membrane will wear out within the array's life, because panels must come off for any reroof and roofing first avoids paying for removal and reset.
No holes, but extra weight and places to rub. The structure must carry the load, and pads under the ballast keep wind movement from wearing the sheet.
The contracts and the point of entry answer that. A moisture survey and a walk show whether water got in at a mount, a seam or flashing, and the finding sets the repair boundary.
Along marked walkways with protection pads, using wash water that drains across the roof and not into the lanes between rows. Cleaning crews need to be told where the membrane is exposed.