EPDM Roofing: Know Everything Before Installing

Written By Adam Paul - Waterproofing Expert

EPDM roofing stands for Ethylene Propylene Diene Monomer roofing. EPDM membranes are made from ethylene and propylene derived from oil and natural gas. As well as EPDM roofing has three main types: fully adhered, mechanically attached, and ballasted. EPDM roofing is mostly used on low-slope and flat roofs. EPDM roofing offers superior water resistance, exceptional flexibility, can last 25 to 30 years, offers outstanding UV resistance, higher chemical resistance, has a class A fire rating, and has a higher seam strength.

EPDM roofing has both pros and consbut it is highly recommended for roofing because it has proven longevity, wide temperature tolerance, fast installation capability, is eco-friendly, and has a strong waterproofing capability. So, as waterproofing experts, we highly recommend EPDM roofing for areas with freeze-thaw cycles, heavy snowfall, or prolonged UV exposure.

You should hire a professional for installing EPDM roofing, and you should follow ASTM D5036 and manufacturer-specific guidelines to ensure installation meets warranty and code requirements. In order to have EPDM roofing last long, it should be protected well. Otherwise, it can be damaged and fail due to environmental and human activities. When EPDM is compared to PVC, PVC roofing can be better than EPDM in some scenarios, but not all. So we highly recommend that you choose the roofing system according to your requirements.

What Is EPDM Roofing?

EPDM roofing stands for Ethylene Propylene Diene Monomer roofing. EPDM membranes are made from ethylene and propylene derived from oil and natural gas. EPDM roofing is available in black or white, with thicknesses typically ranging from 1.1 mm (45 mils) to 1.5 mm (60 mils) and even 2.3 mm (90 mils) for heavy-duty performance.

EPDM roofing has three main types: fully adhered, mechanically attached, and ballasted. The EPDM roofing system consists of EPDM sheets, bonding adhesives, seam tapes, and flashing components. EPDM has higher flexibility, UV resistance, temperature tolerance, and withstands extreme weather zones.

EPDM is a durable, synthetic rubber roofing membrane primarily used on low-slope and flat roofs. Developed in the 1960s, this roofing system has become one of the most reliable solutions in both commercial and residential roofing due to its resilience, cost-efficiency, and simplicity in application.

Read More About: What You Should Know About EPDM Waterproofing?

What Are the 3 Types of EPDM Roofings?

There are three primary types of EPDM roofing systems for roof installations: fully adhered, mechanically attached, and ballasted. Each system suits specific building needs, structural loads, and climate zones.

Fully adhered EPDM involves bonding the membrane directly to the substrate using adhesives. Fully adhered EPDM provides high wind resistance, making it ideal for high-rise buildings or regions prone to storms. 

Mechanically attached EPDM uses fasteners along the seams, offering a lighter option that’s quicker to install but better for low-wind areas. 

Ballasted EPDM uses stone or concrete pavers to hold the membrane down. It adds thermal mass, making it perfect for northern climates with heavy snow. Ballasted EPDM roofing is used where freeze-thaw cycles threaten other systems. Each method follows ASTM D4637 standards to ensure long-term performance and durability.

Read our expert guide about roof waterproofing: What to Know About Roof Waterproofing?

What Are the Properties of EPDM Roofing?

These are the 7 key properties of EPDM roofing

1. EPDM roofing offers superior water resistance
2. EPDM roofing has exceptional flexibility
3. EPDM roofing membrane can last 25 to 30 years
4. EPDM roofing offers outstanding UV resistance
5. EPDM roofing offers high chemical resistance
6. EPDM roofing has Class A fire rating
7. EPDM roofing has higher seam strength

Water Resistance of EPDM Roofing

EPDM roofing offers superior water resistance compared to most traditional roofing systems. EPDM roofing is a fully waterproof roofing membrane with seams sealed using factory-applied tape or liquid adhesives. EPDM roofing prevents leaks even in high-precipitation regions.

EPDM roofings are seamless, large sheets (up to 15 m (50 ft) wide). It reduces the number of joints where water can penetrate from the seams. EPDM roofing retains its elasticity and watertight performance for over 25-30 years without cracking due to UV degradation with minimal maintenance compared to TPO and PVC roofing

Flexibility of EPDM Roofing

EPDM roofing is known for its exceptional flexibility, especially in extreme temperature environments. At Aqviz, we’ve seen EPDM remain pliable down to -45°C (-49°F), which is crucial in preventing cracking during freeze-thaw cycles that often damage other roofing systems.

EPDM maintains its rubber-like flexibility and conforms well to roof penetrations, flashing details, and irregular surfaces compared to TPO or PVC roofing, which can become brittle in cold weather. As well as EPDM roofing elongation capability that exceeds 300%, while PVC typically falls below 200%. This flexibility makes EPDM a better choice for structures with movement or vibration, such as warehouses, metal buildings, and homes in seismic zones.

Durability of EPDM Roofing

An EPDM roofing membrane can last 25 to 30 years, and with proper installation and routine maintenance, it can even reach up to 35 years or more. 

Lifespan varies based on thickness (45 mil, 60 mil, or 90 mil), exposure conditions, and installation quality. Fully adhered 60 mil systems typically offer the best durability. Periodic inspections and timely repairs can extend the life significantly, making EPDM one of the longest-lasting single-ply roofing options available.

EPDM roofing resists weathering and maintains its structural integrity unlike modified bitumen or asphalt-based systems that degrade faster under UV and thermal cycling over time. EPDM’s taped seams offer more reliable long-term performance compared to TPO roofings, which can suffer from heat welding issues and seam failure over time. EPDM membranes also meet ASTM D4637 standards for aging, fatigue, and tear resistance, making them ideal for both residential and commercial roof applications.

UV Resistance of EPDM Roofing

EPDM roofing offers outstanding UV resistance, making it ideal for sun-exposed, low-slope roofs. The carbon black in black EPDM acts as a UV stabilizer, allowing the membrane to resist photodegradation for over 30 years under direct sunlight.

EPDM roofing naturally resists UV without the need for laminated surfacesCompared to TPO and PVC, which often degrade faster without proper additives or top coatings. At Aqviz, we often recommend white EPDM for reflective benefits in hot regions, although both black and white variants provide superior longevity. This high UV resistance helps reduce cracking, chalking, and premature membrane failure, making EPDM an industry standard in high-exposure zones like the Southwest U.S.

Chemical Resistance of EPDM Roofing

EPDM roofing offers high chemical resistance, especially against ozone, alkalis, acids, and industrial pollutants. At Aqviz, we often choose EPDM for commercial roofs exposed to HVAC exhausts, chemical vents, or acid rain zones due to its excellent stability in reactive environments.

EPDM resists deterioration and surface breakdown compared to TPO or PVC roofings, which can degrade under prolonged chemical exposure. EPDM’s cross-linked molecular structure ensures it maintains performance even in facilities with mild chemical outgassing, such as manufacturing plants or labs near industrial zones.

Fire and Heat Resistance of EPDM Roofing

EPDM roofing can be manufactured with fire-retardant properties, meeting Class A fire ratings when installed over suitable substrates and insulation systems. This makes it a reliable choice for fire-prone zones and commercial buildings with strict code requirements.

EPDM is self-extinguishing compared to asphalt-based systems, which can ignite under high temperatures. EPDM maintains its dimensional stability and does not flow under high temperatures while TPO and PVC can shrink or melt under extreme heat. At Aqviz, we follow UL 790 and ASTM E108 standards for fire resistance and recommend fire-rated EPDM membranes for urban and densely packed residential areas.

Seam Strength of EPDM Roofing

The seam strength of EPDM roofing is one of the most reliable among single-ply systems when installed using pressure-sensitive seam tape. These tapes create molecular bonds with shear strengths up to 250 psi, offering consistent watertight seals over time.

EPDM tape seams are quicker and more forgiving during installation compared to TPO and PVC seams, which rely on hot-air welding and require skilled labor to prevent voids. In our field experience at Aqviz, we’ve encountered fewer seam failures with EPDM over a 20-year span. 

What Are the Advantages of EPDM Roofing?

There are five main advantages of EPDM roofing compared to other roofing systems:

1. Exceptional lifespan: EPDM lasts 25-30 years. EPDM roofing outperforms asphalt, bitumen, and most liquid roofing systems.
2. Superior flexibility: EPDM roofing stays elastic down to -45°C (-49°F), which prevents cracking in cold climates, unlike PVC or bitumen.
3. Low maintenance: EPDM roofing seam tape systems and fewer joints reduce the risk of leaks, requiring less ongoing repair than built-up or PU roofs.
4. Cost-effective installation: EPDM is less labor-intensive and has lower material costs compared to PVC and PU coatings.
5. High UV and weather resistance: EPDM roofing withstands prolonged sun exposure without cracking or degradation, unlike asphalt-based roofs.

What Are the Disadvantages of EPDM Roofing?

There are five key disadvantages of EPDM roofing compared to other roofing types, especially in certain building conditions or climates:

1. Aesthetic limitations: EPDM is mostly available in black or white and lacks texture or design options, unlike architectural shingles or metal roofs.
2. Puncture sensitivity: The EPDM membrane can be punctured by sharp debris or foot traffic, unlike built-up roofs or spray-applied coatings.
3. Limited slope application: EPDM is best for low-slope or flat roofs; on steep-sloped roofs, it may not perform well without reinforcement.
4. Adhesive dependency: Fully adhered EPDM systems rely on proper bonding. If any failure can lead to bubbling or seam gaps on the EPDM roofing.
5. Not weldable like TPO/PVC: EPDM roofings seams are taped they are not heat-welded. This can be a disadvantage where monolithic heat-welded seams are preferred.

While EPDM roofing offers many benefits, it also comes with certain drawbacks such as shrinkage over time and vulnerability to punctures. These issues can lead to frequent maintenance or premature repairs, especially in harsh climates. When evaluating roofing options, it’s important to compare materials like PVC and TPO roofing to understand which best suits your building’s needs.

Why EPDM Roofing Is Good for the Roof?

EPDM roofing offers a balanced mix of performance, durability, and affordability. Here are five reasons why EPDM is good for roofing:

1. Proven longevity: EPDM roofing lasts over 25-30 years with minimal degradation, hence it is ideal for long-term investments.
2. Wide temperature tolerance: EPDM roofing performs from -45°C to +120°C, perfect for all U.S. climate zones.
3. Fast installation: EPDM roofing is available in large sheets up to 15 m (50 ft) wide. It reduces seams and speeds up labor efficiency.
4. Eco-friendly disposal: EPDM roofing is recyclable and can be reprocessed at end-of-life, unlike modified bitumen or asphalt.
5. Strong waterproofing: EPDM roofing has a tight protection against standing water or leaks.

In Which Climate Is EPDM Roofing Recommended?

EPDM roofing is highly recommended in extreme temperature climates, both hot and cold, due to its exceptional thermal resistance and flexibility. At Aqviz, we recommend EPDM for areas with freeze-thaw cycles, heavy snowfall, or prolonged UV exposure.

In cold climates like the northern U.S. and Canada, EPDM remains flexible down to -45°C (-49°F), preventing cracks and seam failure during harsh winters. In hot and arid climates like the Southwest, white EPDM reflects UV radiation and helps reduce indoor cooling costs. In humid and rainy regions like the Pacific Northwest, EPDM’s watertight seams and large sheet size reduce leakage risks and pooling water issues. Its chemical and ozone resistance also makes it ideal for industrial zones with pollution or acid rain exposure.

How to Install EPDM Roofing?

At Aqviz, we follow a precise 6-step installation method to ensure long-lasting EPDM performance on flat and low-slope roofs.

1. Clean and prepare the substrate: Remove dirt, debris, and old roofing material. Ensure the surface is dry, smooth, and structurally sound.
2. Lay out the EPDM membrane: Roll out the EPDM sheet over the roof area, allowing it to relax for 30-60 minutes to reduce tension and wrinkles.
3. Apply bonding adhesive: Use a brush or roller to apply adhesive to both the roof surface and underside of the membrane, avoiding puddling.
4. Bond the membrane to the roof: Carefully roll the EPDM roofing membrane into place over the adhesive, using a push broom or roller to eliminate air pockets.
5. Seal seams and edges: Use factory-approved seam tape or flashing tape on EPDM roofing overlaps, corners, and penetrations, pressing firmly for a watertight seal.
6. Inspect and secure flashings: Install edge flashings, termination bars, and walk pads on the roof where needed. Check for EPDM roofing wrinkles, bubbles, or gaps to finalize the job.

We always follow ASTM D5036 and manufacturer-specific guidelines to ensure installation meets warranty and code requirements.

Can EPDM be Installed DIY on the Roof?

Yes, EPDM roofing can be installed as a DIY project for small-scale residential roofs like sheds, garages, or home extensions. You can install peel-and-stick EPDM systems. However, for larger or complex roofs, professional installation is strongly recommended. DIY EPDM roofing can be failed for the large areas due to improper bonding, seam failure, or poor drainage planning within a few seasons.

Professional Roofing Installation Includes 

• Substrate repair, vapor barrier checks, and insulation work
• Use custom-sized sheets for fewer seams
• Use high-performance bonding adhesives and seam tapes
• Seal seat-forming around penetrations and edge flashings
• Compliance with ASTM D4637 and local codes

For roofs over 200 sq.ft., with HVAC units, skylights, or drainage slopes, leave it to certified pros like our Aqviz crew to avoid costly mistakes.

How to Protect EPDM Roofing?

To extend the life and performance of your EPDM roofing, follow these six protective maintenance practices we use at Aqviz for our clients. 

1. Install walk pads: Place rubber pavers in high-traffic zones to prevent punctureson EPDM roofing from foot traffic or tools.
2. Clean debris regularly: Remove leaves, branches, and dirt on roof to prevent membrane abrasion and blocked drainage.
3. Trim overhanging trees: Reduce shade-induced moisture buildup and prevent falling debris from damaging the EPDM roofing membrane.
4. Inspect seams and flashings: Check EPDM roofing annually for signs of lifting or aging adhesive, especially after extreme weather.
5. Avoid petroleum-based products: Do not use solvents, oils, or bitumen on EPDM, as they degrade rubber chemistry.
6. Apply EPDM-safe coatings: For extra UV and puncture protection, apply acrylic or silicone topcoats compatible with EPDM systems.

What are the 6 Ways EPDM Roofing Get Damaged?

While EPDM roofing is known for its durability, it can still be compromised if mishandled or exposed to the wrong conditions. At Aqviz, we’ve encountered many preventable roof failures caused by improper care. Here are six common ways EPDM roofing gets damaged:

1. Using petroleum-based products: Solvents, asphalt, or tar-based sealants, chemically break down EPDM roofing membrane. These solvents cause to swelling, softening, and membrane failure.
2. Dragging tools or sharp objects: Dropped screws, knives, or even rough shoes can puncture or tear the EPDM roofing membrane during installation or maintenance.
3. Improper seam sealing: Using the wrong adhesives, poor surface prep, or rushed seam work can cause gaps and water infiltration through EPDM roofing.
4. Unprotected foot traffic: Walking directly on the membrane without walk pads, especially in hot weather, can stretch or dent the EPDM material.
5. Neglecting drainage design: Poor slope or blocked scuppers lead to ponding water and it can degrade EPDM adhesive bonds and cause membrane bubbling over time.
6. Incorrect flashing installation: Weak or misaligned flashing around skylights, HVAC units, or parapet walls causes water ingress and reduces the EPDM membrane’s edge integrity.
   

To avoid these issues, follow EPDM manufacturer guidelines and always hire certified pros like our team at Aqviz for complex or large-scale roofing projects. 

Is PVC Roofing better than EPDM Roofing?

PVC roofing can be better than EPDM in some scenarios but not all.  PVC roofing is better for chemical-heavy, fire-sensitive environments like restaurants or factories. EPDM is better for cold-weather durability, residential flat roofs, and long-term UV exposure. We always recommend EPDM for northern climates and PVC for roofs needing chemical and fire resistance. 

PVC (Polyvinyl Chloride) is a thermoplastic single-ply membrane that is heat-welded, offering strong, watertight seams. It’s chemically resistant, fire-retardant, and performs exceptionally well in grease-exposed roofs, like restaurants or manufacturing plants. However, PVC roofing tends to become brittle in cold climates, often cracking below -20°C (-4°F), making it less reliable in northern U.S. or Canadian regions.

EPDM (Ethylene Propylene Diene Monomer) is a synthetic rubber that remains flexible down to -45°C (-49°F) and handles thermal expansion better over time. It has taped seams and isn’t weldable, but it offers superior resistance to ozone, UV, and freeze-thaw cycles, which makes it a better fit for residential roofs, warehouses, and northern zones.

What Waterproofing Membranes can be used for Roofs?

Here is a list of common waterproofing membranes used for roof applications

1. EPDM (Ethylene Propylene Diene Monomer)
2. TPO (Thermoplastic Polyolefin)
3. PVC (Polyvinyl Chloride)
4. Bituminous Membrane
5. Modified Bitumen (SBS and APP)
6. Polyurethane Liquid Membrane
7. Acrylic Liquid Membrane
8. Cementitious Waterproofing
9. HDPE (High-Density Polyethylene)
10. LDPE (Low-Density Polyethylene)
11. APP (Atactic Polypropylene) Membrane
12. SBS (Styrene Butadiene Styrene) Membrane
13. Liquid Rubber Membrane

How to Prevent Ceiling Molds?

You can prevent ceiling mold by following 5 ways.

1. Ensure proper drainage.
2. Apply mold-resistant coatings
3. Clean the roof surface regularly
4. Inspect and seal flashings
5. Improve insulation and ventilation

What Roof Shingles Need Waterproofing?

Here are the 8 types of shingles that need waterproofing

1. Asphalt shingles
2. Wood shingles and shakes
3. Slate shingles
4. Metal shingles
5. Composite or synthetic shingles
6. Clay or concrete tiles (shingle-form)
7. Solar shingles
8. Rubber shingles (recycled material)

What are the 12 Types of Roof Shingles?

These are the 12 types of roof shingles that we use for our roofing.

1. Asphalt shingles
2. Architectural shingles
3. 3-tab shingles
4. Wood shingles (including wood shakes)
5. Metal shingles
6. Slate shingles
7. Composite shingles
8. Solar shingles
9. Clay shingles
10. Concrete tile shingles
11. Rubber shingles
12. Fiberglass shingles