Why Sika and K2 Work Together
Installing solar PV on Sika roofs with K2 Systems is the safest and most compliant way to protect your roof while generating renewable energy. Using the wrong fixings can compromise waterproofing, overload the structure, and even void warranties. That’s why Sika, leaders in waterproofing membranes, and K2 Systems, experts in solar mounting, have partnered to create solutions designed specifically for Sika roofs.
The result? A lightweight, watertight, and manufacturer-approved solar mounting system that protects the roof while delivering long-term PV performance.
At PV Plus, we are proud to be approved Sika installers, which means we can offer clients this Sika + K2 solution with full manufacturer confidence.
The Problem with Traditional Ballasted Systems
For many years, solar PV on flat roofs relied on ballasted systems — essentially weighing the panels down with concrete blocks. While simple, this approach comes with serious drawbacks:
- Heavy loads: 50–100 kg/m² is common, exceeding the capacity of many roofs.
- Water pooling: Ballast blocks can obstruct drainage.
- Membrane risk: Uncontrolled movement under wind load can damage waterproofing.
- Warranty concerns: Roof manufacturers may not guarantee performance when non-approved fixings are used.
For buildings with tight structural tolerances — schools, logistics centres, lightweight constructions, or green roofs — ballast is rarely an option.
The SikaRoof® Anchor Solution
The SikaRoof® Anchor system solves these challenges. Anchors are hot-air welded directly to Sika PVC/FPO membranes, creating secure fixing points for K2 mounting systems. No ballast is needed, and the roof’s waterproofing integrity is maintained.
Key Benefits
- Lightweight (<15 kg/m²) – suitable for roofs with limited load capacity.
- Watertight – anchors are welded into the membrane, not drilled through.
- Versatile – works on flat roofs up to 10° and pitched roofs up to 35°.
- Efficient – one anchor typically supports ~2.5 kWp (around six panels).
- Durable – tested for wind uplift, thermal expansion, and long-term weathering.
This system is designed to last as long as the PV installation itself — 20+ years.
K2 Mounting Systems for Sika Roofs
Sika and K2 have worked together to test and approve specific combinations of anchors and mounting structures:
- K2 Dome 6 Xpress / Classic (Solar Hybrid)
– Flat roofs up to 5°
– Versatile, quick to install, all-rounder solution
- K2 Dome 6 Lifted LS (Solar Lifted Peak)
– Flat roofs up to 10°
– Elevated design allows free drainage and easy membrane inspection
- K2 SingleRail IFP (Solar Lifted Parallel)
– Pitched roofs up to 35°
– Panels installed parallel to the roof, aerodynamic and discreet
Each option is engineered to integrate seamlessly with the SikaRoof® Anchor system, meaning clients get a fully approved, manufacturer-backed solution.
Safety, Compliance and Approvals
While the system’s lightweight design is a huge advantage, compliance and approvals are equally critical. Fixing through a waterproof membrane is not something any installer should attempt without approval.
That’s why Sika insists on:
- Sika-approved roofing contractors – to carry out membrane welding correctly.
- Sika-approved solar installers (like PV Plus) – to ensure the electrical system is designed and fitted to standard.
This dual-approval approach ensures:
- Warranties remain valid
- Roof integrity is protected
- Regulations are met for fire safety, wind uplift, and building compliance
Simply put, with Sika and K2 you don’t just get a mounting system — you get a complete system approach, tested, approved, and secure.
Why Choose PV Plus for Sika + K2 Installations
At PV Plus, we specialise in commercial solar PV and are proud to be approved installers for Sika. That means:
- We can design and deliver SikaRoof® Anchor + K2 mounting solutions.
- We partner with Sika-approved roofers to ensure correct welding and membrane protection.
- We understand the compliance requirements — from warranties to MCS standards — so your investment is fully protected.
- We bring experience from schools, councils, and commercial clients who demand both performance and roof protection.
When you choose PV Plus, you’re not just getting a solar installer — you’re getting a long-term partner who understands roofing, compliance, and energy performance in equal measure.
Final Thoughts
The partnership between Sika and K2 Systems has created a specialist solution for installing solar PV on Sika roofs. With the SikaRoof® Anchor system and K2 mounting structures, clients can achieve a lightweight, watertight, and fully compliant installation.
As an approved Sika installer, PV Plus can deliver this system with confidence, ensuring your solar project generates maximum value without compromising the roof beneath.
If you’re considering solar PV on a Sika roof, talk to PV Plus — we combine the approvals, the expertise, and the proven systems to get it right first time.
