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Understanding the Chemical and Organic Effects on Torch-On SBS and PVC Roofing Membranes

Lesa Vanderleek • Apr 06, 2024

When selecting a roofing membrane for your building, understanding the material's resilience to environmental factors is crucial. Two popular options in the roofing industry are Torch-On SBS (Styrene-Butadiene-Styrene) modified membranes and PVC (Polyvinyl Chloride) membranes. Each offers distinct advantages, but their reactions to chemical and organic materials can greatly influence their performance and longevity. Gary van der Leek, a seasoned professional with Vanderleek Roofing Inc., and certified in various roofing specialties, sheds light on these differences.

The Sensitivity of Torch-On SBS Membranes

Torch-On SBS membranes are renowned for their durability and flexibility, making them an excellent choice for weathering the elements. However, their Achilles' heel lies in their vulnerability to chemical attacks. Acids and fats, in particular, pose a significant threat to the integrity of these membranes. The modified asphalt component of Torch-On SBS can degrade when exposed to these substances, to the extent that manufacturers' warranties might be voided if the membrane comes into contact with grease or extreme acids.

Common environmental elements such as pine needles, which release acidic substances as they decompose, or grease from kitchen exhausts can significantly deteriorate the quality of the membrane. This susceptibility makes Torch-On SBS a less ideal option for buildings that are prone to such exposures, like restaurants or those surrounded by coniferous trees.

PVC Membranes: A Robust Alternative

In contrast, PVC roofing membranes offer robust resistance against most acids and fats, making them a superior choice for environments exposed to these elements. This resilience is why PVC is frequently used in commercial settings, particularly restaurants where kitchen exhausts can emit fats and oils that would otherwise harm less resistant materials.

Moreover, homes and buildings situated in areas with substantial natural debris, such as pine needles and leaves, benefit from PVC's durable nature. However, it's essential to note that while PVC stands strong against many chemicals, it has its vulnerabilities. Certain HVAC fluids can negatively affect PVC membranes, and the use of tar-based adhesives or caulking is not recommended. These limitations underscore the importance of a well-considered installation and maintenance strategy.

Expert Insights from Gary van der Leek

With certifications spanning Red Seal Roofing, Duro-Last contracting, and steep pitch roofing, Gary van der Leek brings a wealth of knowledge to the table. His expertise highlights a critical aspect of roofing selection: understanding the material's interactions with its environment. While both Torch-On SBS and PVC membranes have their place in the roofing industry, the choice between them should be informed by the specific chemical and organic challenges the roof will face.

Choosing the right roofing membrane is not just a matter of preference but of performance. As environmental factors play a significant role in the degradation of roofing materials, selecting a membrane that can withstand such challenges is key to ensuring the longevity and durability of your roof. Whether it's the chemical-resistant PVC for a restaurant roof or the flexible Torch-On SBS for a less chemically exposed environment, making an informed decision will save time, money, and ensure the integrity of your building's roof for years to come.

Gary van der Leek
Vanderleek Roofing inc.
VanGalee Manufacturing inc.
Certified Red Seal, Roofer
Certified, Duro-Last contractor
Certified Steep Pitch Roofer
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