Should you use spray-applied or roll-on adhesives for your commercial roofing project? Learn why the right roofing adhesive is crucial for long-term success.
When builders and owners are under pressure to cut costs and increase quality it’s easy to think of not using adhesives in the roofing installation.
Mechanical fastening systems have their place, but adhesives are becoming the choice of commercial roofers – and for good reason. The right adhesive system can make a huge difference to a roof’s life, performance, and overall project cost.
Let’s look at the facts and how you can make sure you’re investing in the right adhesive system for your commercial roofing jobs.
Today’s commercial roofers have a wide range of adhesive solutions to choose from, each designed for specific applications and conditions. The main categories are:
The old faithful of the industry, these synthetic polymer-based products are great for TPO and EPDM roofs. Their quick cure and ability to perform in all weather conditions make them a popular choice for many projects.
As regulations tighten, water-based adhesives are gaining popularity. These products have great coverage rates and are good for TPO, EPDM, and PVC applications. They’re popular in regions with strict VOC regulations and in projects where minimal odor is critical, such as hospitals.
These polyurethane-based products are becoming more popular, especially for fleece-backed membranes. Their consistent cure times, regardless of temperature and humidity, make them a predictable choice for time-critical projects.
These thermoplastic adhesives are applied hot and form a strong bond as they cool. They’re great for modified bitumen roofing systems and have excellent initial tack.
Hot melt adhesives offer waterproofing and can create a smooth monolithic roof surface. While they require special equipment to apply, their fast set times and all weather performance make them perfect for projects where speed and reliability are key.
While mechanical fasteners have their place, modern roofing adhesives have several advantages that make them a great choice for commercial projects:
Adhesive systems create a uniform bond across the whole roof surface, reducing stress points and offer excellent wind uplift resistance. Unlike mechanical fasteners, they eliminate thermal bridging and potential leak points.
Today’s adhesive systems require minimal equipment and can be applied with simple tools like squeegees, rollers, or canister spray systems. This saves labor costs and simplifies the installation process.
Adhesive-based systems create a smoother, more uniform appearance than mechanically fastened systems. This can be important for visible roof sections or projects where aesthetics are critical.
Adhesive systems contribute to a building’s energy performance. Mechanical fasteners can create thermal bridges through the insulation, adhesives create a continuous bond that keeps the roof system intact. This unbroken insulation layer reduces heating and cooling costs. Plus many adhesive systems are compatible with reflective membranes and can help meet cool roof requirements and qualify for energy-related certifications or rebates.
Whether you’re working with single-ply membranes, modified bitumen, or hybrid systems, there’s an adhesive solution for your application. Many modern adhesives can be applied in a wide range of temperatures, giving you more flexibility in project scheduling.
When choosing an adhesive system for your commercial roofing project, here are a few elements to consider:
First, make sure the adhesive is compatible with your roofing substrate. Whether it’s concrete, metal, wood decking, or rigid insulation, your adhesive must be designed for that surface. Consider using a cover board as your membrane substrate – it can provide consistent adhesion and improve energy efficiency by reducing thermal bridging.
Local climate and regulations are critical for choosing the right adhesives. Water-based adhesives might be good for warmer months, and solvent-based for colder months. Check local VOC regulations, as some areas require low-VOC or water-based solutions.
Consider your project needs, such as cure time, odor restrictions (especially in hospitals or schools), and application method. Some projects might need spray-applied products for faster installation, while others might require roll-on for more controlled coverage.
Choosing the right adhesive system may seem challenging – but it’s a decision that pays off in roof performance, longevity, and overall project success.
By taking the time to understand your project requirements and working with experienced manufacturers and contractors, you can select an adhesive system that meets your needs today and for years to come. Don’t view adhesive selection as a minor detail – make it a key part of your commercial roofing system’s long-term success.