TPO Membrane
The welded white option
- Seams
- Welded with hot air
- Surface
- White, reflects summer heat
- Repairs
- Weld a new patch on clean sheet
- Good On
- Warehouses, food plants, offices
- Weak Spot
- Punctures where crews walk
White Membrane Roofs
Reading TPO Roofing Contractor
Heat-Welded TPO Seams Around Curbs, Drains, and Parapet Walls
Reading TPO roofing is the white membrane work we do most: we install TPO over new insulation on flat commercial roofs.
- SeamsHot-air welded laps
- SurfaceWhite, reflective sheet
- Under ItPolyiso and cover board
- DetailsCurbs, drains, edges
TPO vs EPDM: Is Reading TPO Roofing a Fit?
Before Reading TPO roofing goes on a building, we compare it with EPDM for that roof. The equipment and exhaust above the deck often decide it.
EPDM Membrane
The rubber alternative
- Seams
- Taped and primed
- Surface
- Black, holds heat
- Repairs
- Primed patch with seam tape
- Good On
- Mill buildings, low slopes
- Weak Spot
- Old tape lifting at laps
Close call on your roof? We look at drainage, access around equipment, and seam work at the curbs before choosing.
TPO Roofing Problems We See on Reading Roofs
These conditions show up on older single-ply roofs in the city and decide whether a new TPO roof is the next step.
Seams That Look Neat but Peel
A weld can look straight and still be cold. Probing old TPO laps often finds sections that lift with a hook tool, which lets water travel under the sheet.
Punctures Along Service Paths
Dropped tools and boots near rooftop units leave small holes in the membrane. Wet insulation spreads out from those holes long before a ceiling stain shows.
Shrunk Flashing at Unit Curbs
Flashing that pulls tight at curb corners tears over time. A replacement sets new curb flashing with enough height above the finished roof.
Water Sitting Near the Drains
Low spots around drains keep the sheet wet and dirty. Tapered insulation under the new TPO moves that water to the outlet.
Grease and Exhaust Stains
Kitchen and process exhaust can soften some membranes. On food plants and bakeries, we check what lands on the roof before choosing the sheet.
Perimeter Metal Pulling Loose
Edge metal with missing fasteners lets wind get under the TPO. New edge metal and termination bars lock the sheet at the perimeter.
TPO Roofing Options for Reading Buildings
The sheet is one part of the roof. Here are the assembly choices we price on a TPO job.
| Choice | Options | What Decides It |
|---|---|---|
| Attachment | Mechanically fastened, fully adhered, or induction welded plates | Deck type, wind exposure at the edges, and noise limits inside the building |
| Membrane Thickness | Standard and thicker sheets | Foot traffic, equipment service visits, and how long you plan to own the building |
| Insulation | Polyiso boards with a cover board, tapered where needed | Energy code at reroof time and the slope needed to reach the drains |
| Edge Detail | New edge metal, coping, or termination bar | Parapet height, wall condition, and how the old edge was built |
| Walkways | Welded walkway pads to the units | How often HVAC or process crews cross the roof |
What New TPO Roofing Gives a Reading, PA Building
A TPO replacement brings the whole flat roof back into a known condition.
Buildings We Roof
- Warehouses
- Food Plants
- Offices
- Medical Buildings
- Retail Centers
- Schools
A White Surface That Stays Cooler
The light sheet reflects summer sun, which helps keep the top floor and rooftop units from running hot.
Welded Laps You Can Test
Every seam gets probed after welding, so weak spots get fixed while the crew is still on the roof.
Better Drainage Under the Sheet
New tapered insulation sends water to the drains instead of leaving it on the membrane.
Clear Routes to Equipment
Walkway pads mark the path to units and protect the membrane where service crews walk.
Old Single-Ply Seams Opening Up?
Call and describe the roof. We will set up a walk with core cuts and a seam check.
Call UsHow Reading TPO Roofing Goes On
The steps below match how a TPO roof gets built on an occupied building.
TPO Install Ticket5 Steps
- 1
Inspect Your Roof and Test the Old Seams
On The RoofWe probe laps, check curbs and drains, and take core cuts to see whether the insulation is dry enough to stay or must come off.
- 2
Pick Attachment, Thickness, and Insulation
PaperworkYour scope lists the fastening pattern, sheet thickness, insulation layers, tapered areas, and edge metal, so two bids can be compared line by line.
- 3
Strip, Insulate, and Fasten in Sections
On The RoofWe remove only what we can close by the end of the day, set new board, and fasten or adhere the TPO sheet over it.
- 4
Weld Seams With Trial Welds First
On The RoofEach day starts with trial welds cut and pulled by hand. That sets the welder for the heat and the sheet before seams go down.
- 5
Probe, Photograph, and Hand Over
PaperworkEvery seam gets probed, details get photographed, and you receive the system records with a marked roof plan.
Other Roof Systems We Install in Reading
TPO fits many flat roofs, but not every one. These three cover the rest.
EPDM RoofingEPDM Rubber Membrane
Rubber sheets for low slopes and older mill buildings, adhered or ballasted to match the deck and the structure below it.
Compare EPDM
Industrial RoofingPlant and Shop Roofs
Roof replacement planned around stacks, ducts, curbs, and production shifts on manufacturing buildings.
See industrial work
Commercial Metal RoofingMetal Panel Roofs
Standing-seam and exposed-fastener panels for warehouses, shops, and farm storage buildings.
See metal roofs
Reading TPO Roofing Questions
Short answers about the membrane, its seams, and the parts under it.
The Basics
What Is TPO Roofing?
TPO stands for thermoplastic polyolefin, a single-ply sheet sold mostly in white. It is laid over insulation on flat roofs, then joined by melting the laps together with hot air. The weld becomes one piece with the sheet once it cools.
What Is Included in a TPO Commercial Roof Assembly?
The sheet sits on insulation and a cover board, held down by fasteners or adhesive, with flashing at every curb, drain, and wall. Drainage and edge metal are part of it too. We price the whole assembly, so nothing important is left to a change order.
Weak Points
What Are the Downsides of TPO Roofing?
The sheet can be punctured where crews walk, and seams depend on the welding conditions that day. Tight spaces beside curbs make welding harder. We plan service paths and detail spacing so those weak points are handled in the design.
Which TPO Weaknesses Deserve Attention Around Rooftop Machinery?
Foot traffic, dropped parts, and cramped flashing at unit curbs cause most TPO trouble near machinery. We check how much room each curb leaves for a proper weld and whether exhaust lands on the sheet, then add walkway pads along the service route.
Seams
How Do EPDM and TPO Differ at Roof Seams?
Hot air melts TPO laps into one piece. EPDM laps are joined with primer and seam tape made for that system. Both need a clean, dry surface. We look at how each method works around your curbs and edges before choosing.
Can a TPO Seam Look Neat Without Being Properly Welded?
Yes. A straight, tidy seam can still be a cold weld. We run trial welds at the start of each day and after weather changes, pull them apart by hand, and probe finished seams, since dirt and welder settings affect the bond.
Get Reading TPO Roofing Priced for Your Building
Send the address and a few words about the roof. We will walk it, cut cores, and write up the TPO assembly.