PVC

Single-ply,
the Siplast way

Premium single-ply roofing systems with exceptional performance
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Discover how Siplast does single-ply differently

Siplast has evolved from our days as the premiere SBS provider to a company that’s committed to help provide solutions to your toughest challenges. For many years, we’ve strategically expanded our product portfolio to match your project range. With you every step of the way includes smaller budget projects that still require the highest level of partnership. The expansion of our single-ply line introduces a broader material price structure that helps enable building owners to choose a premium single-ply solution, backed by Siplast support, product engineering, and performance standards. That’s single-ply, the Siplast way.

Parasolo: The single-ply engineered for excellence

To meet the highest standards of performance, durability, and reflectivity, it comes down to chemistry. Siplast Parasolo® is our expanded portfolio of premium single-ply roof membranes engineered to provide top-of-line protection and longevity. Available in PVC, PVC KEE, and TPO technologies, Parasolo® enables you to choose a cutting-edge, cost-effective solution without compromising on quality. Whichever Parasolo® solution you choose, you can count on performance and precision in every layer. Backed by partnership and support at every stage of the project. Parasolo® is how Siplast does single-ply.

* Siplast warranties and guarantees do not provide coverage against exposure to chemicals, oil and grease. Refer to siplast.com for more information on warranty and guarantee coverage and restrictions.

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Benefits of Parasolo® single-ply systems

To meet the highest standards of performance, durability, and reflectivity, it comes down to chemistry. Parasolo® is our portfolio of premium single-ply roof membranes engineered to provide top-of-line protection and longevity. Available in PVC, PVC KEE, and TPO technologies, Parasolo® enables you to choose a cutting-edge, cost-effective solution, without compromising on quality.

Easy to install

Large rolls are installed as a single layer, so application can require less time and labor than muti-ply roof systems

Durability

Crafted with a robust blend of premium materials that can help to provide long-term waterproofing protection

Water-tight seams

Extremely strong seams, when welded properly, create a continuous waterproof layer

Siplast single-ply specifications

Parasolo is available in TPO, PVC, and PVC KEE membranes.
A large roll of Parasolo TPX, a gray TPO single-ply roofing membrane engineered by Siplast for superior heat-weldability and reflectivity.

The TPO that redefines the standard

Parasolo® TPX™ is the advanced TPO membrane engineered by Siplast to deliver outstanding heat-weldability and reflectivity. But we didn't stop there. We built it with exceptional resistance to punctures, tears, and impacts.* This TPO doesn’t just meet industry standards—it transcends them. With weathering capabilities up to 5.5 times greater than the ASTM G155 standard† and robust seam strength exceeding the ASTM D6878 standard. Above all, Parasolo® TPX™ is the only TPO that passes Siplast standards.
View TPX Sell Sheet

Industry standard TPO ASTM D6878

Parasolo® TPX™‡

Seam Strength

 66 lbf 134 lbf

Elongation

 15% 30%

Dimensional stability

 1% <0.4%

Breaking strength

 220 lbf 385 lbf

Weather resistance
(ASTM G155)

 10,080 kJ/m2 >56,000 kJ/m2
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* Siplast warranties and guarantees do not provide coverage against hail or punctures except where additional puncture resistance coverage is purchased for eligible systems. Contact Siplast for more information. Refer to applicable warranty or guarantee for complete coverage and restrictions.

† In ASTM G155 testing, Siplast Parasolo Smooth-Surface 60 mil membranes achieved 56000kj/m2 vs. the Test Standard of 10,080kj/m2.

‡ Values for Parasolo TPX 60 Mil Smooth stated are approximate and subject to normal manufacturing variation. These values are not guaranteed and are provided solely as a guide.

A roll of dark gray Parasolo PVC KEE roofing membrane, engineered by Siplast for long-term protection against weathering, chemicals, and UV exposure.

Parasolo PVC KEE: Performance and protection, perfected by chemistry

Parasolo® PVC KEE is the premium PVC membrane engineered by Siplast to deliver ultimate thermoplastic roof membrane protection. Our chemical formulation consists of a high-quality combination of PVC and KEE plasticizers incorporated with Elvaloy®* copolymer, a non-migrating solid flexibilizer. The result is a membrane that provides exceptional resistance against weathering, chemicals,†  and UV exposure while maintaining its low temperature flexibility. With the toughness and customizable solutions for complex roof designs and challenging environments. That’s how performance and long-term protection is powered by chemistry.
A large roll of Parasolo PVC, a gray single-ply roofing membrane engineered by Siplast for long-term performance and protection in challenging environments.

Parasolo PVC: Engineered for excellence

Siplast Parasolo® PVC membranes are engineered for long-term performance in the most challenging environments. Our advanced formulation harnesses the inherent protection of PVC against chemicals,†  oil, and grease,* resulting in a membrane that helps endure more. Delivering outstanding strength, flexibility, and thermoplastic properties where it's needed most, with exceptional long-term weathering and UV resistance proven in ASTM D4434 and G155 testing. Plus, it offers excellent fire performance compared to other non-PVC single-ply roofing technologies.‡
* Elvaloy® is a registered trademark of DuPont™.
†  Siplast warranties and guarantees do not provide coverage against exposure to chemicals, oil and grease. Refer to siplast.com for more information on warranty and guarantee coverage and restrictions. 
‡ In Class A E108 testing, specific Parasolo PVC roofing assemblies have demonstrated the capability to extinguish even when the flame source remains applied to the assembly.

Industry standard PVC ASTM D4434

Parasolo PVC*

Parasolo PVC KEE*

Chemical resistance

 Good Best

Seam strength

 150 lbf >300 lbf >300 lbf

Breaking strength

 200 lbf >300 lbf >300 lbf

Tear strength

 45 lbf >110 lbf >110 lbf

Elongation

 15% >72,000 kJ/m2 30%

Accelerated weathering
ASTM G 154†

 12,240 kJ/m2 30% >72,000 kJ/m2
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Bar chart comparing thickness standards, showing that while ASTM allows a 60-mil product to be 54 mils, a Siplast True Thickness 60-mil sheet is 62 mils.

True Thickness options

ASTM standards for thermoplastic membranes allow for significant thickness variation, up to 10%. This means that a 60-mil product can have an actual thickness of 54 mils. Siplast offers True Thickness options for both Parasolo PVC and KEE sheets which must be special ordered. For example, a Siplast True Thickness variant of 60-mil sheet will have an average thickness of 62 mils. For more information or to order a Siplast True Thickness membrane, contact your Siplast representative.

Specifying the hybrid assembly

SBS brings the multi-layer redundancy, while PVC/PVC KEE provides the reflectivity and resistance to elements. Add on the advantages of phased construction and the advantages are multi-ply’d.

A deconstructed, view of a Siplast hybrid roof assembly, showcasing the multi-layered system, including a Parasolo single-ply cap sheet and a Paradiene SBS-modified bitumen base ply.

Performance isn’t added. It’s multi-ply’d.

For projects demanding the ultimate in durability and protection, Siplast offers a hybrid roof assembly that delivers on all fronts. It combines the elongation and recovery properties of a Siplast Paradiene® SBS-modified bitumen base ply with the advanced chemical formulation of a Parasolo® single-ply cap sheet. The result is a system with multi-layer redundancy and increased impact and puncture resistance.* The elastomeric base ply absorbs roof stresses while the Parasolo® cap sheet shields the system from the elements and provides exceptional reflectivity. Another advantage is that a hybrid assembly allows for phased construction, providing greater flexibility for your project timeline. Siplast doesn't just sell this system—we trust it so much that it’s installed on one of our warehouses.
View Hybrid white paper
* Siplast warranties and guarantees do not provide coverage against hail or punctures except where additional puncture resistance coverage is purchased for eligible systems. Contact Siplast for more information. Refer to applicable warranty or guarantee for complete coverage and restrictions.
Drawing of a single-ply roof detail for a PVC, KEE, or TPO system, demonstrating proper installation for high performance and durability.

Single-ply roofing details

View detail drawings for our PVC, PVC KEE, and TPO single-ply roof systems, designed to meet the highest standards of performance, durability, and reflectivity.
Go to Detail drawing library

Installing Parasolo

Installation & Assembly

View installation references

Additional resources

Tapered polyiso insulation boards provide proper drainage

ASTM D6754 & Polymer Content

ASTM D6754 Standard and Polymer Content Analysis in Single-Ply Roof Membranes
View ASTM D6754 white paper
A worker in a yellow shirt performs roof repair and maintenance, symbolizing Siplast's guide on maximizing a roof's service life.

Roof Repair & Maintenance

Access the Siplast Roof Repair and Maintenance Guide for best practices on how to maximize your roof’s service life.
View maintenance guide
Aerial view of a modern building with a high-performance SBS-modified bitumen roof system.

RISE blog

Considerations for single-ply roofing

A building’s location, function, and other characteristics, such as roof access points, drainage, and local building codes, all play a significant role in determining which single-ply roofing system would be the best option.

Compatibility with existing roof structures

Different single-ply membranes are made from different polymers, so it's important to confirm chemical compatibility with the existing roof.

Compliance with building codes and regulations

Ensure that the roofing system complies with local building and fire codes, zoning laws, and local ordinances that could affect working hours.

Appropriate insulation and drainage systems

A well-designed polyiso tapered insulation board creates a slope towards drainage points, while strategically placed roof drains ensure efficient water flow off the roof, preventing ponding.
View insulation products

Frequently asked questions

Single-ply roof membranes serve as the primary protective layer for the roof. While they are designed for durability, heavy foot traffic or activities on the roof can wear on the surface over time. If your roof is expected to experience heavy foot traffic or other intensive use, you may want to consider a multi-ply system. In these systems, the primary roof protection lies beneath a finished surface ply, offering enhanced durability for high-traffic areas.
Yes, single-ply roof systems can be walked on. However, depending on the type and volume of foot traffic, a single-ply roof can be supplemented with further protection, such as using a thicker 80-mil membrane or walkway protection pads. If the roof system is expected to get routine or frequent traffic, then a multi-ply SBS-modified bitumen roof system may be a more suitable solution.
Most single-ply membranes come with one of two types of surface backings - smooth or fleeceback. While fleeceback membranes can provide enhanced durability, they also have certain installation restrictions. Ensure you are choosing the right membrane surfacing type for your application. If you have questions contact a Siplast representative to be connected to Design Services.
A single-ply roofing system may be covered under a manufacturer's warranty or guarantee for anywhere from 15-35 years, depending upon the thickness of the membrane and the method of attachment.*
* Additional requirements apply. Contact Siplast for more information. See applicable warranty or guarantee for complete coverage and restrictions.