Kazakhstan - 500 kwp trapezoidal roof

Project Overview

This 500 kWp rooftop solar PV project in Almaty, Kazakhstan, is designed for a commercial trapezoidal color steel roof. Utilizing an aluminum mini rail solution, the system delivers a lightweight design, reliable waterproofing, and high mechanical resilience against Almaty's extreme climate.

The Challenge

• Extreme Climate & Heavy Snow Load Resilience: The Challenge: Almaty experiences severe winters with heavy snow accumulation (up to 5,400 Pa / 1.8 kN/m²) and extreme temperature fluctuations (range from -30°C to +35°C). Heavy snow pressure combined with rapid thermal expansion and contraction puts immense localized stress on short mini-rail anchor points, which can risk fastener shearing or rubber seal fatigue if not precisely calculated.
• Thin Sheet Pull-Out Strength & Wind Uplift: Industrial color steel trapezoidal sheets are relatively thin (typically 0.5 – 0.8 mm). Unlike traditional long-rail systems that span across structural steel purlins, mini rails rely directly on the roof sheet crests. High wind uplift forces place concentrated tension on self-drilling screws, requiring strict on-site pull-out testing (exceeding 1.2 kN/fastener) to prevent sheet tearing.

Our Solution

1. High-Strength AL6005-T5 & Thermal Expansion IsolationEngineered Load Capacity: Structural AL6005-T5 aluminum alloy mini rails engineered to withstand heavy snow accumulation up to 5,400 Pa.  Thermal Stress Relief: Short mini-rail segments (150–380 mm) isolate thermal movement locally. This prevents expansion and contraction differential between aluminum and steel sheets from shearing fasteners or stressing panels during Almaty's extreme -30°C to +35°C temperature swings.  

2. Crest-Anchored Fasteners with Verified Pull-Out ResistanceHigh Pull-Out Strength: High-grade bi-metal self-drilling screws anchored into sheet crests undergo strict on-site torque verification to ensure pull-out resistance exceeds 1.2 kN per fastener.  Wind Uplift Distribution: Optimized mini-rail distribution spreads dynamic wind uplift forces (up to 2,400 Pa) evenly across multiple roof crests, preventing thin steel sheet tearing. 

The Result & Impact