Flat Roofing
Low-slope roofs where water has to be driven off, not shed.
What flat roofing involves
Membrane systems with the drainage and terminations detailed for a roof that holds water if you let it.
On a flat roof the drainage plan is the roof. Everything else is material choice.
What matters on flat roofing
Drainage before material
The first question on any low-slope roof is where the water goes. Ponding is what kills membranes, and a roof that holds water for days after a storm will fail early regardless of which sheet is on it. We look at the slope, the drains and the terminations before we talk about material.
Seams and terminations
Field failures on commercial roofs are rare. Failures at seams, curbs, drains and the parapet edge are common. A hot-air welded seam that has been probed is a continuous sheet. Anything taped or glued and unverified is a scheduled leak.
Flat Roofing on real jobs
How the system goes together
Pipe boots and roof penetrations
The rubber collar around a plumbing vent is the shortest-lived thing on most roofs. Ultraviolet at this elevation cracks that rubber long before the shingles are tired, and the crack sits directly over an open hole in the deck. Lead boots or a metal collar with a replaceable seal last considerably longer.
Everything that comes through gets a plan
Furnace flues, swamp cooler curbs, satellite mounts, solar standoffs. Each one is a hole somebody has to detail correctly.
Counterflashing let into the masonry
Where a roof meets brick or stone, the honest detail cuts a groove into a mortar joint, tucks the top edge of the metal into it, and seals the groove. Water running down the wall face hits metal and gets thrown out onto the roof. The shortcut runs the metal flat up the wall and caulks the top edge, which works until the caulk moves.
Surface-mounted is a temporary answer
We will do it that way on an emergency repair and tell you plainly that it needs to be cut in properly when there is time.
What we check
- Field condition and granule loss
- Valleys, ridges and every transition
- Penetrations and their flashing
- Gutter and fascia condition
How we approach it
Look first
We get on the roof and read what is actually happening before quoting anything.
Say what we find
Photographs and a plain explanation, including when the answer is that you do not need us yet.
Built in sequence
Crews we hire and run, working the right detail in the right order.
Leave it clean
Magnet over the yard, container gone, walked with you.
Hail does not always look like damage
Hail here can be pea sized and harmless or big enough to bruise a mat. A bruise is a soft spot where the granules are knocked loose and the fiberglass underneath is fractured. You cannot see it from the ground, and from a ladder you often have to feel for it with a thumb.
Soft metal tells the truth
Before we call a roof hit, we check the soft metals: vents, gutter aprons, the fins on a swamp cooler. Dents there are the honest record of what fell.
The wet spring snow problem
Late season storms carry more water per inch than anything that falls midwinter. That heavy stuff clings to a roof instead of sliding, pushes on gutters, and refreezes at night into a solid mass on the overhang. It is also the load most likely to find a framing weakness.
After a heavy spring storm
Walk the drip line and look for bent gutter hangers and separated seams. Then look at the ceilings inside along exterior walls.
What we check on the deck
Spongy sheathing between rafters, especially over the eave where the ice sat.
What this looks like on a real roof
There is a version of flat roofing that gets sold off a clipboard in the driveway and a version that comes off actually reading the roof. The second one costs the same and lasts.
What follows is the part most people never get told: what usually went wrong before we arrived, and what the job looks like when it is done in the right order.
Where roofs go wrong
The shortcut we see most
A membrane laid over wet insulation because tearing off would have cost a day. The roof looks finished, the moisture stays underneath, and the sheet fails early from below.
What good looks like instead
Moisture surveyed, wet sections cut out and replaced, drainage corrected, then the membrane installed and its seams probed.
Signs worth a look
- Ponding water still standing two days after rain
- Seams that have lifted or opened at an edge
- Blisters or ridging across the field
- Interior staining near drains, curbs or the parapet
What to expect
Scheduling around your operation
Most commercial work can be staged so the disruptive part happens when the building is quiet. Tear-off noise, crane or hoist time and material deliveries all get planned against your hours rather than ours.
What the roof survey covers
Before specifying anything we survey the existing assembly: slope and drainage, moisture in the insulation, the condition of seams and terminations, and how the roof is being used. A roof somebody walks on weekly needs a different answer from one nobody touches.
Documentation
Commercial and public work runs on records. We photograph the existing condition, the work in progress and the finished assembly, so there is a file rather than a recollection.
Related work
Commercial covers more than one job, and they are not interchangeable. These are the others in the same family, each on its own page.
Questions we get asked
Not the question you had? Call the shop and ask a person. We would rather talk it through than have you guess from a website.
(801) 382-8898Which membrane is right for my building?
It depends on the traffic, the exposure and what comes out of the exhaust. TPO and PVC are welded and light, EPDM is proven and has fewer seams in wide sheets, mod-bit and built-up are heavier assemblies. We specify for the building rather than for what is on the truck.
Can you work around our business hours?
Usually. Most commercial work can be staged so the noisy part happens when the building is quiet, and we talk about that before the schedule is set.
How long does a commercial membrane last?
It depends far more on drainage and detailing than on the sheet itself. A membrane with standing water on it and a membrane that drains properly will not last the same length of time.
Do you handle the insurance side?
On hail-damaged roofs, we work with your insurance to get the roof covered. We document the damage thoroughly with photographs, so the claim reflects what is actually on the roof.
Do you work through the winter?
Yes, with judgment. Shingles need to seal, and in genuine cold that takes longer or needs hand sealing. Emergency work happens whenever it has to. Full replacements get scheduled around the weather rather than forced into it.
How do I know when a roof is getting close?
Granules collecting in the gutters, tabs lifting or curling at the edges, shingles that look bare in patches, and daylight or staining in the attic. Any of those is worth a look.
Ask about flat roofing
Call (801) 382-8898 or send a note. We will look at the roof and tell you straight what it needs.