The Fastensol Flat Roof Tray — Extended Option takes the standard ballasted flat roof tray and widens its compatibility using the manufacturer's 140mm mini rail, allowing it to accept solar modules up to 1140mm wide in landscape orientation. This is the correct choice where panels exceed the 1010mm width limit of the standard tray kit, without moving to a different mounting system.
As with the standard tray, this is a ballasted, penetration-free solution for flat roofs and ground-mounted arrays — the tray sits on the roof surface and is held down with loose ballast such as gravel or stone, avoiding fixings through the roof covering.
Up to 1140mm
Max Panel Width
Landscape
Module Orientation
Please Note: This kit does not include the Fastensol aluminium end clamps (4 required per tray), which must be ordered separately. It also requires the installer to drill additional fixing holes in the side of the plastic tray to mount the 4x 140mm mini rails.
Extends Panel Width to 1140mm
Adding the 140mm mini rail to each side of the standard plastic tray increases the maximum compatible module width from 1010mm to 1140mm, covering a wider range of panel formats.
Ballasted, Penetration-Free Fixing
Uses the same ballasted tray approach as the standard kit — the tray sits on the roof surface and is held down with loose ballast, avoiding roof penetrations.
4 x 140mm Mini Rail Included
Each kit includes 4 x 140mm mini rails, fixed to the sides of the plastic tray to extend its width and provide a mounting edge for the module.
18 Degree Tilt Angle
Retains the same 18 degree tilt as the standard tray, improving energy yield and rainwater run-off over a flat-laid panel.
Suitable for Roof or Ground Mounting
Can be used for both flat roof and ground-mounted PV arrays, for framed or frameless, crystalline or thin film modules.
Ballast Calculator Available
A dedicated ballast calculator is available to confirm the correct ballast weight for your specific site conditions, which may allow a lower ballast weight than the datasheet's standard figure.
Kit Includes
Fastensol Plastic Tray
1 x tray
Mini Rail
4 x 140mm mini rail
Not Included
Aluminium End Clamps
4 required per tray — not supplied, order separately
Compatibility
Panel Width
Up to 1140mm (with extension)
Module Orientation
Landscape
Module Type
Framed or frameless, crystalline or thin film
Technical Data
Project Site
Flat roof or ground mount
Max Building Height
Up to 20m
Tray Material
HDPE (black)
Installation Notes
Additional Drilling Required
Extra fixing holes must be drilled in the side of the tray to mount the 4x 140mm mini rails
Ballast Requirement
Standard datasheet figure applies unless a lower weight is confirmed by the project-specific ballast calculator
Number of Trays Required
1 more tray than the number of modules in the row
Good to Know: A ballast calculator is available to confirm the exact ballast weight required for your specific wind zone, building height, and roof location. In many sheltered locations, a lower ballast weight than the standard datasheet figure can be used.
For reference, the manufacturer's ballast calculator gives the following tray weights across the UK's five wind speed zones, based on the standard (non-extended) tray and a reference module measuring 2094mm x 1096mm.
Wind Zone
Wind Speed
Wind Pressure
Ballast Weight per Tray
Zone 1
<22 m/s
0.00303 kg/cm²
47 kg
Zone 2
22–24 m/s
0.0036 kg/cm²
56 kg
Zone 3
24–26 m/s
0.004 kg/cm²
66 kg
Zone 4
26–28 m/s
0.005 kg/cm²
76 kg
Zone 5
>28 m/s
0.006 kg/cm²
87 kg
Please Note: This table reflects the standard tray footprint. Because the extended tray carries a wider module using the added 140mm mini rails, its wind-loaded area differs from the reference figure above — always re-run the ballast calculator with your actual extended module width rather than relying on this table alone. Wind zones broadly correspond to UK region: Zone 1 covers most of southern England, Zone 2 the Midlands and much of England and Wales, Zone 3 northern England, Northern Ireland, and the Scottish Central Belt, Zone 4 the Scottish Highlands and coastal areas, and Zone 5 the most exposed upland and far-northern locations.
What does this extension option add over the standard tray kit?
It adds 4 x 140mm mini rails, which fix to the sides of the standard plastic tray to extend the maximum compatible panel width from 1010mm up to 1140mm.
Does this kit include the end clamps needed to fit the panel?
No. This kit does not include the Fastensol aluminium end clamps (4 per tray), which are required to secure the module and must be ordered as a separate item.
Do I need to modify the tray to fit the mini rails?
Yes. Fitting the 4x 140mm mini rails requires drilling additional fixing holes in the side of the plastic tray, in addition to the holes already present.
Is this still a ballasted, non-penetrating system?
Yes. Like the standard tray kit, this extended option is a ballasted solution — the tray sits on the roof surface and is held down using loose ballast such as gravel or stone, with no fixings through the roof covering.
How do I know how much ballast I need?
Use the manufacturer's ballast calculator for your specific site conditions. In some sheltered locations this may confirm that a lower ballast weight than the standard datasheet figure can be used.
How do I know which wind zone applies to my site?
The manufacturer's ballast calculator splits the UK into five wind speed zones, from Zone 1 (under 22 m/s, most of southern England) to Zone 5 (over 28 m/s, the most exposed upland and far-northern sites). Check the calculator with your project's actual location and extended module width before confirming ballast weight.
