flat roof garage EPDM rubber

When it comes to installing an EPDM (Ethylene Propylene Diene Monomer) roof, a common question is whether it needs to be glued down.

The answer depends on several factors, including the type of installation method you choose and the specific requirements of your project.

 

Installation Methods for EPDM Roofing

Fully Adhered System

  • This is where the EPDM membrane is glued directly to the substrate using a special adhesive.
  • Benefits: This method ensures a smooth, secure finish with excellent wind uplift resistance. It’s ideal for roofs with complex shapes or numerous penetrations.
  • Considerations: Applying adhesive can be tricky, especially in wet conditions. It requires careful application to avoid bubbles and ensure complete coverage.

Mechanically Attached System

  • This is where the EPDM membrane is secured to the roof deck with mechanical fasteners instead of adhesive.
  • Benefits: This method is quicker to install and less affected by weather conditions. It’s cost-effective for larger roofs.
  • Considerations: Proper installation of fasteners is crucial to prevent leaks. This method may not be suitable for roofs with intricate details.

Ballasted System

  • This is where the EPDM membrane is laid loosely over the roof deck and held in place with heavy ballast, such as gravel or pavers.
  • Benefits: This is the quickest and easiest method, requiring no adhesive or fasteners. It also provides extra UV protection.
  • Considerations: The roof structure must support the additional weight of the ballast. This method isn’t suitable for steeply sloped roofs or areas with high winds.

Community Insights on Glue Usage

From the DIY forums, it's clear that many professionals and DIY enthusiasts favour the fully adhered method for a more secure and aesthetically pleasing finish.

Some say that leaving EPDM unglued can lead to ripples due to expansion and contraction, although it might still remain waterproof.

Others highlight the advantage of using adhesive for a more professional look and easier handling of the material.

Final Thoughts

Whether you need to glue down your EPDM roof depends on the specific needs of your project.

While a fully adhered system provides a secure and smooth finish, mechanically attached and ballasted systems offer viable alternatives that can save time and money.

Each method has its own benefits and considerations, so it’s important to evaluate your roof’s requirements and consult with a professional roofer to determine the best approach.

Whether glued down or not, the key is a proper and professional installation for optimal results!

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