EPDM (ethylene propylene diene monomer) roofing is a favoured choice in the construction industry, particularly for flat roofs.
Its popularity stems from its excellent durability, cost-effectiveness, and impressive lifespan, which can extend up to 50 years with proper installation and maintenance. You can read more about the benefits of EPDM flat roofing in our other blog.
This guide provides a comprehensive step-by-step approach to installing an EPDM roof, covering the necessary materials and tools, crucial health and safety tips, and detailed installation procedures.
Remember, we are a leading supplier of ClassicBond, a popular membrane used on flat roofs.
Materials and Tools Needed
Before starting the installation process, it is essential to gather all the necessary materials and tools. Here is a comprehensive list of what you will need:
- EPDM rubber membrane: The main material for your roofing.
- Broom and soft brush: For cleaning the roof surface.
- Angle grinder or mortar chisel: For preparing the roof edges.
- Water-Based Deck Adhesive: For the main adhesive application.
- DIY Kit: For applying the deck adhesive.
- Contact adhesive: For the roof perimeter and vertical upstands.
- Sharp knife: For cutting the EPDM membrane.
- EPDM tape: For sealing edges and corners.
- Paint brush: For applying adhesives and primers.
- EPDM Rubber Primer: To prepare surfaces for EPDM tape.
- Penny roller: To ensure a secure bond of the EPDM tape.
- Masonry drill: For installing wall trims.
- Mastic: For sealing trims and joints.
- Hammer: For fixing fasteners.
Key Takeaway: Having all the required materials and tools before starting will ensure a smooth and efficient installation process, saving you time and potential frustration. 🛠️
Health & Safety Guidelines
Safety should always be a top priority when working on any roofing project. Ensuring that all safety measures are in place will protect you and anyone else involved in the project. Here are some essential safety tips to follow:
Clear all debris & tripping hazards
- Ensure the roof surface is free of any debris that could cause tripping or falling.
- Remove any leftover materials from previous roofing layers.
Keep the weather in mind
- Avoid working on the roof in adverse weather conditions such as rain, snow, or ice.
- Choose a dry, mild day for the installation to prevent slips and ensure the adhesives work correctly.
- On hot days, wear appropriate sun protection and stay hydrated.
Don’t turn your back
- Never turn your back on the roof’s edge.
- Use safety tape to mark safe walkways and construct barriers around roof hatches or large openings.
Appropriate workwear
- Wear sturdy work shoes with good grip.
- Use personal protective equipment (PPE) such as gloves, goggles, and hard hats.
Key Takeaway: Prioritizing safety by following these guidelines can prevent accidents and injuries, ensuring a safe and successful roofing project. ⚠️
Step-by-Step Installation Guide
The following steps outline the process for installing an EPDM roof, from surface preparation to finishing touches.
Each step is crucial for achieving a durable and long-lasting roof.
- Surface Cleaning & Preparation
Proper preparation of the roof surface is critical to ensure the EPDM membrane adheres correctly and performs well over its lifespan. Here’s how to do it:
- Brush down the roof surface: Use a soft brush to remove all dirt, grease, dust, and debris.
- Remove existing coverings: Strip away old asphalt layers or any other existing materials.
- Ensure dryness: Make sure the roof surface is completely dry; moisture can hinder the adhesive process.
- Inspect for cracks and gaps: Fill any gaps larger than a quarter of an inch with wood strips.
- Prepare for wall trim flashing: Use an angle grinder or mortar chisel to chase out the brick mortar joint.
Key Takeaway: Thoroughly cleaning and preparing the roof surface is essential for the EPDM membrane to adhere properly and perform effectively. 🧹
- Positioning and Resting the Membrane
Once the roof surface is prepared, the next step is to position and rest the EPDM membrane. This step ensures that the membrane fits perfectly and reduces the likelihood of wrinkles.
- Unfold and lay the EPDM membrane: Ensure it covers the entire roof with an overhang for the adjacent walls and roof edge.
- Install drip batten and trim: Position these along the roof’s edge for effective rainwater drainage.
- Allow resting time: Leave the membrane for about 30 minutes to allow natural expansion.
Key Takeaway: Allowing the EPDM membrane to rest and expand before securing it ensures a smooth, wrinkle-free installation. 📏
- Applying Water-Based Adhesive
The next step involves applying the water-based adhesive to secure the membrane to the roof deck.
- Fold back the membrane: Carefully fold it to expose half of the roof deck.
- Apply the adhesive: Use a 9” roller to spread the adhesive evenly, leaving a 150mm space around the perimeter.
- Reposition the membrane: Roll the EPDM back into position while the adhesive is still wet.
- Remove trapped air: Use a broom to sweep across the EPDM, ensuring a smooth bond.
Key Takeaway: Even application of the adhesive and careful repositioning of the membrane are crucial for a strong and smooth bond. 🖌️
- Applying Contact Adhesive
The contact adhesive is applied to the perimeter and vertical upstands for a secure edge.
- Fold back the un-adhered EPDM: Expose the 150mm perimeter section.
- Apply contact adhesive: Use a thin coat on both the roof deck and the back of the EPDM membrane.
- Ensure touch-dry adhesive: Wait until the adhesive is touch-dry before re-folding the membrane.
- Trim excess membrane: After applying the adhesive, trim any excess EPDM from the walls and upstands.
Key Takeaway: Proper application of contact adhesive ensures the edges and vertical upstands are securely bonded. 🏗️
- Using EPDM Tape
EPDM tape is used to waterproof profiles and ensure all corners and edges are securely sealed.
- Cut EPDM tape to size: Allow for an appropriate upstand height with extra length and width.
- Apply EPDM rubber primer: Evenly coat the area, slightly exceeding the tape application area.
- Press down the tape: After the primer is touch-dry, press the tape down and stretch to secure.
- Use a penny roller: Apply light pressure with a penny roller to ensure full bonding.
Key Takeaway: Using EPDM tape and primer correctly ensures all edges and corners are watertight, preventing leaks and extending the roof's lifespan. 🛡️
- Installing Wall Trims
Wall trim installation is essential for a clean finish and additional weatherproofing.
- Drill and fit wall trim: Use a masonry drill to create holes for RawlPlugs and fasteners.
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Apply EPDM mastic: Carefully apply mastic to the wall trim and wall chase out for sealing.
Finishing Edges
The final step involves finishing the edges to ensure a neat and secure installation.
- Fold the EPDM membrane: Pinch and fold to form a ‘pigs ear’, then fold onto the roof side.
- Position and install edge trims: Secure the plastic trim kerb edge, cutting to the appropriate length.
- Install drip/gutter front trim: Secure these trims and trim any excess EPDM membrane.
Key Takeaway: Finishing the edges neatly ensures a professional look and contributes to the roof's durability and effectiveness. ✂️
Post-Installation Care Tips
Proper maintenance is key to maximizing the lifespan of your new EPDM roof. Regular inspections, cleaning, and prompt repairs can prevent minor issues from becoming major problems.
Regular Inspections
- Inspect the roof semi-regularly for early signs of damage.
- Check for cracks, splits, loose sections, and weak areas.
- Pay special attention after adverse weather conditions.
Cleaning
- Keep the roof clear of debris to minimize damage risks.
- Gently sweep or rinse off dirt and grime.
- Use a roof cleaner and soft brush for thorough cleaning.
- Avoid high-pressure water from hoses or jet washes.
Repairs
- Repair any splits, cracks, or holes promptly.
- Ignoring small damages can lead to larger, more expensive problems.
Key Takeaway: Regular maintenance and prompt repairs are essential for prolonging the life of your EPDM roof and ensuring it performs optimally. 🧰
Closing Thoughts
Installing an EPDM roof is a rewarding project that can significantly enhance the durability and longevity of your roofing system.
By following this comprehensive guide, you can achieve a professional-quality installation that stands the test of time. If you're inspired to undertake this project, consider exploring the high-quality EPDM membranes available at Trade Warehouse.
For any further questions or assistance, our friendly customer service team is always ready to help. Contact us at 0208 037 6020 or use our live chat feature.