The ULAMEX aluminum ballast handle “Z” is a specialized non-penetrating flat roof solar mounting component engineered for east-west dual-orientation PV layouts. Its distinctive Z-shaped profile positions two rows of solar modules back-to-back at a pre-set 15-degree tilt angle — one facing east, the other facing west — maximizing roof coverage and delivering more consistent energy output throughout the day compared to single south-facing configurations. Manufactured from EN AW-6060 T6 aluminum, this lightweight yet structurally robust ballast handle sits directly on the roof membrane with EPDM protective pads, using concrete blocks or gravel as dead-weight ballast to resist wind uplift without drilling, screwing or otherwise penetrating the roofing surface. Ideal for commercial and industrial flat roofs with EPDM, TPO, PVC or bituminous membranes.
Technical Specifications
| Parameter | Value |
|---|---|
| Material | Aluminum EN AW-6060 T6 |
| Profile shape | Z-shaped (dual-orientation east-west) |
| Tilt angle | 15° (fixed, pre-set) |
| Orientation | East-west dual layout |
| Ballast type | Concrete blocks, gravel fill |
| Compatible membranes | EPDM, TPO, PVC, bituminous |
| Compatible profiles | 40×40 mm, 45×40 mm PV aluminum profiles |
| Module orientation | Portrait and landscape, up to 2,200 mm |
| Roof protection | EPDM pads (placed beneath handles) |
| Standards | Eurocode EN 1991 wind/snow load, EN 1090 |
How It Works — Installation on Flat Roofs
The Z-shaped ballast handle is installed directly on the flat roof membrane. Place EPDM protective pads on the membrane surface to prevent abrasion, then position the Z-handles at the calculated spacing intervals. Slide PV aluminum profiles into the handle channels and secure them with M8 T-bolts and sliding nuts. Mount solar modules onto the profiles using middle and end clamps. Finally, load concrete blocks or gravel into the ballast cavity of each Z-handle until the calculated dead weight is reached. The Z-profile creates two inclined planes at 15 degrees — one tilted east, the other west — so each module row faces the morning or afternoon sun respectively. No roof penetrations are required at any stage, preserving the roofing manufacturer’s waterproofing warranty.
Compatible Components
The aluminum ballast handle “Z” forms the foundation of a complete non-penetrating flat roof PV system from ULAMEX. Build out the system with aluminum PV profiles (40×40 mm or 45×40 mm), middle and end clamps to secure modules, and T-bolts, sliding nuts and fastener kits for all connections. If your flat roof project requires variable tilt angles rather than the fixed 15° of the Z-handle, consider combining standard aluminum ballast handles with adjustable PV triangles for a south-facing configuration.
Application Scenarios
Commercial flat roofs — east-west layout: The Z-handle is designed specifically for east-west dual-orientation arrays on large commercial buildings such as warehouses, logistics centres, supermarkets and office complexes. This layout covers up to 30% more roof area than south-facing configurations because the lower tilt angle and dual orientation minimize inter-row shading, allowing rows to be placed closer together.
Industrial buildings with membrane roofing: Factories and production halls with EPDM, TPO or PVC membranes benefit from the fully non-penetrating installation. The distributed ballast weight typically stays well within the structural capacity of commercial flat roofs (1.0–5.0 kN/m²), and the EPDM pads prevent membrane damage.
Energy yield optimization: East-west arrays produce a flatter generation curve across the day — less peak at noon but more output in the morning and late afternoon. This profile often matches commercial electricity consumption patterns better than a south-facing layout with a sharp midday peak, reducing grid export and increasing self-consumption rates.
Flat roofs with limited structural capacity: Because east-west layouts require less ballast per module than steeply tilted south-facing systems (lower wind uplift due to the 15° angle), the Z-handle configuration can be deployed on roofs with lower load-bearing capacity.
Selection Guide — When to Use the Z-Handle
Choose the aluminum ballast handle “Z” when your project requires an east-west flat roof layout with a fixed 15° tilt. This is the optimal choice for maximizing roof utilization on large, flat commercial and industrial roofs. If instead you need a south-facing configuration with variable tilt between 10° and 35°, pair the standard aluminum ballast handles with PV triangles. For projects requiring maximum structural rigidity or heavy-duty wind resistance, consider the galvanized steel ballast handles as an alternative material option.
Standards and Certifications
ULAMEX aluminum ballast handles are manufactured from EN AW-6060 T6 aluminum conforming to European material standards. All ballast systems are designed for wind and snow load calculations under Eurocode EN 1991. ULAMEX operates under EN 1090 certification for the execution of steel and aluminum structures, guaranteeing full traceability and quality documentation. Ballast weight calculations should be performed by a qualified structural engineer for each specific site, accounting for wind zone, building height, roof edge proximity and local snow loads.
Why Choose ULAMEX
With over thirty-five years in the metals trade, ULAMEX delivers ballast mounting components at B2B wholesale conditions across Europe. Our integrated product range covers every element of a flat roof PV system — from the ballast handles and profiles to the clamps and fasteners — enabling single-source procurement that reduces your supplier count, shipping costs and coordination overhead. Contact us for project-specific quotations, lead times and technical support.
Frequently Asked Questions
What is the advantage of an east-west layout over south-facing on a flat roof?
An east-west layout using Z-handles covers up to 30% more roof area because the lower mutual shading at 15° allows rows to be placed much closer together. The energy yield per square meter of roof is higher, even though yield per module is slightly lower than a steeper south-facing tilt. East-west layouts also produce a more balanced generation profile across the day, which better matches typical commercial load patterns.
How much ballast weight is needed per Z-handle?
Ballast requirements depend on wind zone, building height, proximity to roof edges and module size. Typical values range from 8 to 25 kg per module. A structural engineer must validate the ballast calculation for each specific project based on Eurocode EN 1991 parameters. ULAMEX can provide reference calculations and layout drawings upon request.
Will the Z-handle damage my flat roof membrane?
No. The Z-handle system is designed for fully non-penetrating installation. EPDM protective pads are placed beneath each handle to prevent membrane abrasion. The distributed load from the ballast blocks typically remains within the structural limits of commercial flat roofs. No drilling, screwing or adhesive bonding is required at any point during installation.
Can Z-handles be used with large-format 400W+ modules?
Yes. The ULAMEX aluminum ballast handle “Z” accommodates modules up to 2,200 mm in length in both portrait and landscape orientation. For specific module dimensions, contact our technical team for compatibility confirmation and spacing recommendations.