Commercial Flat Roofs in Leander, TX
A flat roof on a building does not forgive shortcuts. Plenox handles low-slope and built-up commercial roofs across TX, sets the drainage right, and backs the work with a lifetime workmanship warranty.
What a commercial flat roof really is
A “flat” roof on a commercial building is almost never dead level. It is a low-slope roof: it sits at a shallow pitch so water has somewhere to go, but not enough pitch to shed it on its own the way a steep residential roof does. That changes everything about how the roof has to be built. On a low-slope deck the water sits, drains slow, and goes looking for the weakest seam, so the entire system lives or dies on how the drainage is set and how the seams and details are joined. Get those two things right and a flat roof runs for decades. Get them wrong and you are chasing leaks every spring.
The other thing about a commercial flat roof is what lives on it. HVAC curbs, exhaust fans, pipe penetrations, drains, scuppers, equipment stands, sometimes a whole rooftop unit: every one of those is a hole through the membrane that has to be flashed and sealed by hand. A built-up roof, a modified-bitumen system or a single-ply membrane all handle the open field fine. Where roofs fail is at the curbs, the drains and the edge, and that is the part you cannot rush. Plenox details every penetration by hand and never leaves the edge metal to chance.
We work on flat and low-slope roofs of every kind across TX: retail and storefronts, warehouses, offices, restaurants, churches, apartment buildings and the low-slope sections on homes. When you are ready, your free roof quote costs nothing and the visit is no-obligation.
Where roofs fail is at the curbs, the drains and the edge, and that is the part you cannot rush.
Plenox SolutionsWhat commercial flat roofing covers
- Built-up and modified-bitumen systems
- Single-ply membrane (TPO) installs
- Full tear-off and re-roof
- Re-cover over a sound existing roof
- Tapered insulation and re-slope for ponding
- Curb, pipe, drain and scupper flashing
- Edge metal, parapet and coping detail
- Leak repair and roof restoration
How we put a flat commercial roof down
No numbered circles, no sales theater. Here is the order we work in on a low-slope commercial roof, every time.
We get on the roof and read the whole deck
Before anyone talks price we get up top and walk it. We find the ponding low spots, the soft and wet insulation, the failed seams and the penetrations that were never flashed right. On a commercial building that walk also tells us whether the deck can carry a re-cover or needs a full tear-off, because a new membrane laid over wet insulation is a problem you pay for twice.
We fix the drainage before anything else
On a flat roof the slope is the whole game. If water ponds and sits, we build the pitch back in with tapered insulation so every drain and scupper actually clears after a TX downpour. Standing water is what ages a flat roof early and finds the seams, so we set the drainage first and lay the new system on top of a deck that finally drains.
We seal the field, then hand-detail every penetration
The open field of a flat roof is the easy part. The work is at the curbs, drains, scuppers, pipe collars, parapet walls and edge metal, where almost every commercial leak actually starts. We flash and seal each of those by hand and tie them into the field so the roof reads as one watertight surface, not a membrane with a dozen weak spots punched through it.
We stand behind it for life
The finished roof carries a lifetime workmanship warranty plus six years of weatherproofing done annually, included. On a commercial flat roof that annual visit earns its keep: we catch a lifted seam, a clogged drain or a tired flashing in year two and re-seal it long before it ever shows up as a stain on a tenant’s ceiling.
Why ponding water is the enemy of a flat roof
If you remember one thing about a commercial flat roof, make it this: water that does not drain is what kills it. On a steep residential roof the rain is gone in minutes. On a low-slope commercial deck the water moves slow, and anywhere the slope is off it pools and stands. Ponding water is constant weight, constant moisture and constant UV cooking the membrane in one spot, and over a TX summer that is exactly where a built-up or single-ply roof starts to blister, split and let go at the seam. A roof that ponds badly is on a clock no matter how good the membrane is. That is why our first move on every flat roof is to fix the drainage with tapered insulation, not to slap a new sheet over a deck that was always going to hold water.
The second killer is the details, the curbs and drains and edges where the membrane gets interrupted. A flat roof on a TX building is loaded with rooftop equipment, and every unit, vent and drain is a place the field stops and a hand-made seal takes over. Spring hail and the kind of wind that grabs a loose edge go straight for those weak points, so a flat roof here has to be detailed for both heat and storms. We tie this into ventilation done the way Lomanco taught us, so trapped heat and moisture are not working on the deck from underneath while the storms work on it from above. If your building is staining tenant ceilings, pooling water after every rain, or splitting at the seams, those are the signs a flat roof is at the end of its system life. The same crew also handles commercial roofing, TPO roofing and storm restoration, so the whole low-slope picture gets handled by one team. See finished work in our project gallery.
Low-slope commercial roof, edge and drainage detail
Backed in writing, not just promised
A flat roof on a building is an asset that quietly protects everything underneath it, so who installed it matters more than the brand on the roll. Our crews are OSHA certified, which on a commercial roof with rooftop equipment and live edges is not a line on a brochure, it is the standard the work is held to. We are also Lomanco-certified in attic ventilation design, so trapped heat and moisture are pulled out instead of left to work on the deck from below a low-slope membrane.
Every commercial flat roof we put down carries a lifetime workmanship warranty, so we stand behind how the field was sealed and how the curbs, drains and edges were detailed for as long as you own the building. On top of that, the job includes six years of weatherproofing done annually, with a tech back on your roof each year checking drains, seams and flashings and re-sealing small issues before they grow. That is how a flat roof, the kind that is easy to ignore until it leaks on a tenant, actually goes the full distance.
Commercial flat roofs, answered
The questions property managers and building owners ask us most about low-slope and built-up roofs. Not sure which fits your building? Call and we will tell you straight.
Call (432) 288-5562Is a commercial flat roof actually flat?
Almost never. A commercial “flat” roof is really a low-slope roof: it is built at a shallow pitch so water has a path to the drains, but not enough pitch to shed rain on its own the way a steep residential roof does. That shallow slope is why drainage and seam detailing matter so much. The whole system is designed around moving water off a deck that wants to hold it, so we set the slope and the drains before we set the membrane.
What systems do you use on a flat commercial roof?
It depends on the building, the deck and how the roof gets used. For the open field we install built-up and modified-bitumen systems as well as single-ply membrane, most commonly TPO, which gets heat-welded into one watertight skin and reflects the TX heat. We pick the system after we get on the roof and see what is up there, then detail the curbs, drains and edges by hand whichever way we go. You can read more about the membrane option on our TPO roofing page.
Why does my flat roof keep ponding water?
Ponding means the slope is off, the drains are undersized or clogged, or the insulation has compressed and created a low spot. Water that stands instead of draining is the single biggest cause of early flat-roof failure, because it is constant weight, moisture and UV in one place. We fix it by building the pitch back in with tapered insulation so every drain and scupper actually clears, rather than laying a new membrane over a deck that was always going to hold water.
Can you re-cover my old flat roof instead of tearing it off?
Sometimes, yes. If the deck is sound and the existing roof is not holding water in the insulation, a re-cover with new insulation and a fresh system is a real option and it saves the cost and disruption of a full tear-off, which on an occupied building matters. We make that call after we get on the roof and check what is under the surface. If the insulation is wet or the deck is failing, a re-cover only hides the problem, so we tear off and start clean.
Where do commercial flat roofs usually leak?
Almost never in the open field. The leaks start at the details: the curbs under rooftop HVAC units, the pipe and drain penetrations, the scuppers, the parapet walls and the edge metal. Every one of those is a place the membrane stops and a hand-made seal takes over, so that is exactly where we slow down. We flash and seal each penetration by hand and tie it into the field, and our annual weatherproofing visit checks those same details every year.
Do you only do big commercial buildings?
No. We handle flat and low-slope roofs across the whole range: warehouses and offices, but also storefronts, restaurants, churches, apartment buildings and the low-slope sections on homes. The low-slope method is the same whether it is a single porch roof or a full commercial field, and the same crew that handles a warehouse will handle a back-of-house restaurant section. Tell us what the building is and we will tell you what it needs.
Tell us about your flat or low-slope roof
We started Plenox to do it the right way and build lasting relationships, so the first thing we do is come look. Tell us what the building is doing, a stain, a pond, a split seam, and we will give it to you straight. Your free roof quote costs nothing and you are under no obligation.
Commercial flat roofs in Leander and across TX
Home base is Leander and the Austin metro, but the crew travels statewide for the right commercial flat-roof job. A few of the cities we cover:
See every service area →