Wynnewood, PA
1201 Andover Road
Wynnewood PA 19096
Phone: (610) 555-1212
Email: adam@grayoakroofing.com
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Proudly serving the Main Line and the broader Montgomery, Delaware, Chester counties.
Flat & Low-Slope Roofing
Durable, energy-efficient flat roofing engineered for superior drainage.
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Flat Roofs Don't Fail — Poorly Installed Flat Roofs Do
Flat and low-slope roofing sections are more common on the homes in our service area than most homeowners realize. Rear additions, sunrooms, bay window covers, and sections of colonial and split-level homes throughout Montgomery, Delaware, and Chester Counties frequently include low-slope areas that are often the source of persistent leaks and water intrusion — not because flat roofing is inherently problematic, but because these sections are routinely specified or installed incorrectly.
A flat roof is a fundamentally different system than a steep-slope roof. Water doesn’t shed by gravity alone — it drains, pools briefly, and requires a membrane that is fully adhered, properly detailed at every edge and penetration, and installed with the specific technical demands of low-slope drainage in mind. When those details are right, a flat roof is a durable, weather-tight system. When they’re not, it becomes the persistent problem that most homeowners associate with the roof type itself.
At Gray Oak Roofing & Exteriors, we install EPDM and TPO flat and low-slope roofing systems across Montgomery, Delaware, and Chester Counties — most often as part of a larger project where a home has both steep-slope and low-slope sections that need to be addressed together and integrated correctly.
What We Offer
Flat & Low-Slope Roof Replacement
A complete flat roof installation from the deck up — substrate inspection and preparation, appropriate insulation board where needed, membrane installation fully adhered or mechanically fastened to the correct specification for the product, and properly detailed terminations at every edge, wall, drain, and penetration. We install EPDM and TPO systems and select the appropriate product based on the size of the section, the drainage conditions, the thermal demands of the application, and how the flat section integrates with the adjacent steep-slope roofing.
Why Flat Roofing Requires a Different Approach
The details that determine flat roof performance are different from those on a steep-slope system — and they’re less forgiving of error. On a shingle roof, water that gets past a minor defect typically sheds before causing serious damage. On a flat roof, any gap in the membrane, any termination that isn’t fully sealed, or any drain that isn’t correctly integrated with the field becomes a point where water accumulates and eventually finds its way into the structure.
The transition between a flat section and the adjacent steep-slope roofing is one of the most common failure points on older homes in our service area. Original installations that used shingles to cap the transition, or that relied on sealant rather than properly integrated flashing, develop leaks as materials age and movement works the joints open over time. Addressing a flat roof section correctly means treating the transition as a system detail, not an afterthought.
The Gray Oak Standard
Flat roofing fails at the edges, at the drains, and at every point where the membrane meets something else — a wall, a pipe, a curb. Getting those details right requires patience and precision that a rushed installation simply doesn’t allow for. We treat every termination and every penetration as a critical detail, because on a flat roof, it is.
Every flat roofing project is managed personally from estimate to completion — one contact, one standard, start to finish. The same person who assessed your roof and specified the system is accountable for how it’s installed. When the work is done you’ll know exactly what was put down and why — and you’ll have a direct line back to us if anything comes up afterward.
Flat Roofing Systems
EPDM — Ethylene Propylene Diene Monomer
EPDM is a single-ply rubber membrane that has been the dominant flat roofing specification for residential applications for decades — and with good reason. It’s flexible, highly resistant to UV degradation and ozone, handles the thermal cycling of our climate well, and is available in sheet widths that minimize seams on smaller residential sections. A fully adhered EPDM installation on a properly prepared substrate is a durable, low-maintenance system with a realistic service life of 20 to 30 years. EPDM is our default specification for most residential flat roof sections — it performs reliably, is well suited to the range of flat section sizes common on homes in our service area, and has a long track record in this climate.
TPO — Thermoplastic Polyolefin
TPO is a single-ply thermoplastic membrane heat-welded at the seams, producing a monolithic waterproof bond that is stronger than the membrane itself at the joints. TPO’s reflective white surface performs well in applications where thermal efficiency is a priority, and the heat-welded seam system is particularly well suited to larger flat sections where EPDM’s adhesive seams would present more linear footage of potential failure points. TPO has a shorter track record than EPDM in residential applications but has established itself as a credible, well-performing specification where its characteristics suit the application.
Get Started Today
As a local roofing company, we’re here to help you protect what matters most, your home.
Contact Us
Wynnewood, PA
Phone: (610) 995-6260
Email: adam@grayoakroofing.com
Signs Your Flat Roof Section Needs Attention
- Active leaks or water staining on ceilings directly below a flat roof section
- Visible ponding water that remains on the roof surface 48 hours or more after rainfall — indicates a drainage deficiency
- Membrane that is visibly cracked, blistered, or pulling away from termination edges
- Seams or flashings that are lifting, open, or patched with sealant
- A flat section that has been repeatedly caulked or patched and continues to leak
- A flat roof that is 20 or more years old and has never been fully assessed or replaced
What to Expect
- Assessment & Estimate — We evaluate the flat section's substrate, drainage, existing membrane condition, and how it transitions to any adjacent steep-slope roofing. We give you a clear picture of what the system needs and a written estimate for the work.
- Product Selection — We walk you through the EPDM or TPO options appropriate for your specific section and application, and explain what drives the recommendation.
- Scheduling — One point of contact throughout. We coordinate flat and steep-slope work on the same project so transitions are handled correctly as a single integrated scope.
- Substrate Preparation — Existing membrane removed, deck inspected and repaired as needed, insulation board installed where required by the application.
- Membrane Installation — Fully adhered or mechanically fastened to manufacturer specification, with all terminations, drains, and penetrations properly detailed and integrated.
- Final Walkthrough & Follow-Up — We confirm the work with you before we consider the job complete, and you have a direct line back to us if anything comes up afterward.
How long does a flat roof last?
A properly installed EPDM or TPO system has a realistic service life of 20 to 30 years. The variables that most affect longevity are installation quality — particularly the membrane terminations and penetration details — drainage adequacy, and whether the system has been maintained and minor issues addressed before they become larger failures. Flat roofs that fail early almost always do so at termination edges, seams, or penetrations rather than through membrane failure in the field.
Why does my flat roof keep leaking even after it's been patched?
Repeated patching on a flat roof is almost always a sign that the underlying system has reached the end of its serviceable life or that the original installation had fundamental deficiencies that patching can’t address. Sealant and patch repairs address the symptom at a specific location — they don’t address membrane shrinkage, termination failure across the whole perimeter, or drainage deficiencies that are causing water to pond against the edges. A flat roof that has been patched multiple times and continues to leak is typically a replacement candidate, and continued patching defers cost while allowing water to work on the substrate beneath the membrane.
Can a flat roof be installed over an existing membrane?
In some cases yes, where the existing membrane is fully adhered, flat, and the substrate beneath it is dry and sound. In most residential situations we recommend a full tear-off — it allows inspection of the deck, removes the accumulated weight of old membrane layers, and gives the new installation a clean substrate to adhere to. The cost difference between a tear-off and an overlay is modest on the residential flat sections common in our service area, and the performance difference is meaningful.