When it comes to flat roofing systems, few names carry the same global weight and long-term credibility as Sika. With over 100 years of innovation in construction materials and waterproofing technology, Sika is a trusted manufacturer in sectors ranging from infrastructure and industry to education, healthcare, and data centres. At PV Plus, we’re proud to be approved solar installation partners for Sika — a partnership that allows us to deliver expertly integrated solar PV systems on Sika’s world-class roofing platforms.
Who Is Sika?
Sika is a Swiss-based, multinational company that develops and manufactures specialty chemicals for construction and industrial applications. Founded in 1910 and now operating in over 100 countries, Sika has built a reputation for delivering systems that are not only high-performing and long-lasting but also meet the growing demands of sustainability, innovation, and climate resilience.
Their roofing division is especially well-known in the UK for premium single-ply membranes and liquid-applied systems used on thousands of schools, commercial buildings, and industrial facilities.
Why Choose Sika?
Here are just a few reasons why Sika is considered one of the most reliable roofing system providers in the industry:
- Over 60 years of experience in flat roofing systems
- Proven durability with systems lasting well beyond 30 years in real-world use
- In-house manufacturing with full quality control and traceability
- Systems tested to meet and exceed fire, wind uplift, and thermal performance standards
- Trusted by leading architects, councils, main contractors, and large corporations
- Backed by robust guarantees and BBA certifications
- Strong focus on sustainability, circularity, and decarbonisation
Sika is also a member of the Association for the Decarbonization of Industry, reflecting their ongoing investment in sustainable solutions and carbon reduction across the built environment.
Sika Roofing Products: Overview and System Benefits
Sika’s roofing portfolio includes a range of membranes, insulation systems, and liquid technologies designed to deliver tailored performance depending on the project type, from lightweight new builds to complex refurbishments and green or solar roof installations.
Here’s a summary of the key Sika roofing products:
Sarnafil®
Sika’s flagship single ply membrane, Sarnafil is a high-performance thermoplastic (PVC) system renowned for its durability, weather resistance, and proven performance over decades. Available in adhered, mechanically fixed, and ballasted options, Sarnafil is ideal for complex detailing and long-life commercial roofs.
Best for:
- New builds and refurbishments
- Projects with high fire, wind or UV exposure
- Sites requiring architectural detailing or aesthetic finishes
Sikaplan®
A versatile, cost-effective single ply membrane system, Sikaplan offers high flexibility and easy installation for a wide range of roof types. It provides excellent value without compromising on performance, making it ideal for large-scale commercial or industrial buildings.
Best for:
- Value-engineered flat roofs
- Logistics, manufacturing, and warehouse sites
- Fast-paced construction programmes
Sikalastic®
Sikalastic is Sika’s cold-applied liquid waterproofing system. It’s perfect for roofs with complex detailing, sensitive environments, or where flame-free application is required. It forms a seamless, fully bonded waterproof layer and is ideal for overlays, detailing, or complete roof renewals.
Best for:
- Refurbishments, overlays, and flame-free zones
- Complex penetrations, upstands, or detailing
- Schools, hospitals, or occupied buildings
SikaShield®
A robust bituminous membrane system, SikaShield provides multilayer waterproofing for flat and sloped roofs. It combines traditional bitumen performance with modern installation technology, offering strong protection against water ingress, root penetration (for green roofs), and mechanical wear.
Best for:
- Inverted roofs, green roofs, and terraces
- Projects requiring high puncture resistance
- Long-term commercial roof protection
Sarnatherm®
Sarnatherm is Sika’s thermal insulation range, designed to work seamlessly with their membranes and deliver excellent U-values for both new and refurbished roofs. Available in PIR, mineral wool, and tapered formats, it helps meet Part L compliance and optimise energy efficiency.
Best for:
- Warm roof build-ups
- High thermal performance and fire rating requirements
- Reducing operational energy costs
We’re an Approved Solar Installation Partner for Sika
We’re proud to be recognised as approved solar PV installers for Sika — a partnership that ensures your solar installation is designed, mounted, and waterproofed in full alignment with the roof system manufacturer’s standards.
When you install solar PV on a Sika roof with PV Plus, you benefit from:
- Fully compliant mounting systems approved by Sika’s technical team
- Guaranteed membrane compatibility — no risk of invalidating roof warranties
- Joint project support from both PV Plus and Sika during design, install, and handover
- Optimised layouts for long-term performance, load distribution, and drainage
- Seamless integration with Sarnafil, Sikaplan, or Sikalastic membranes
Whether you’re retrofitting PV onto an existing Sarnafil roof or planning a new build with Sikaplan and solar from day one, our team will work with you and Sika to get it right — with minimal disruption and maximum long-term benefit.
Why Solar + Sika Makes Sense
Combining Sika roofing systems with solar PV is a smart move for commercial clients, offering:
- Reduced energy bills and improved ESG reporting
- Compliance with Net Zero targets and Part L upgrades
- Enhanced asset value and roof functionality
- Compatibility with biosolar and green roof build-ups
- Peace of mind with long-term waterproofing and electrical guarantees
Final Thoughts
Sika continues to lead the way in roofing system innovation, with products that balance technical performance, aesthetics, and sustainability. At PV Plus, we’re proud to deliver solar installations that meet those same high standards — helping building owners, contractors, and councils get the most from their roofs.
If you’re planning a Sika roof or looking to add solar to an existing one, get in touch. We’ll work alongside Sika’s technical team to design and deliver a solution that works — for your building, your budget, and the planet.
