PV OverRoof System
TM
The only solution for mounting PV onto roofs fitted with fibre-cement roof sheets
Key benefits of PVOverRoof™
• The solution for fibre-cement (and
asbestos-cement) clad roofs
• The solution for metal-clad roofs where purlins are weak
• Minimal disruption to roof surface;
retains roof sheet warranty
• Direct mounting onto rafters removes
loading issues on purlins
• Spacing between roof and modules
reduces module temperature and
increases PV output
• UK snow and wind loading compliant
(subject to building suitability/
strengthening) – meets MCS012 criteria
• Simplifies roof maintenance
• Bankable and insurable
• Approved by Landini and Marley Eternit
PV OverRoofTM
PV OverRoof™ is the only viable solution for fibre-cement (and older asbestos–cement) roofs and is fully endorsed by the leading roof sheet suppliers. PV OverRoof™ can
also be used on metal-clad roofs in cases where the purlin strength may not be sufficient
for the PV load. PV OverRoof™ eliminates the fixing issues associated with traditional
hanger bolts.
The key to PV OverRoof™ is a structure that only connects to the building’s rafters. A
series of sturdy aluminium beams bridge between the rafters that then directly support
the PV modules. These aluminium beams are effectively new purlins arranged above the
existing roof.The small number of rafter mounting points are fitted with a bespoke flashing system eliminating any chance of leaks in these areas with the remaining roof surface
left untouched. Thus PV OverRoof™ also solves loading problems with timber purlins or
lightweight zed purlins.
The PV modules are suspended above the roof surface maximising module cooling. This
spacing along with a gap between modules of 20mm, ensures any existing transparent
roof panels still maintain a reasonable light level in the building. If a roof sheet needs
replacing, this is easily achieved as only the modules directly above the damaged roof
sheet need to be removed. The final installation meets all UK snow and wind loading
requirements (subject to a building survey).
With PV OverRoof™ you can enjoy all the benefits of PV without in any way compromising the integrity or life span of your roof - it can even be argued using PV OverRoof™
extends the life of the roof since it provides a degree of protection from the effects of
sun, wind and rain. PV OverRoof™ maintains your roof sheet guarantee and bankability,
along with insurance, are a given.
• Completely water tight
Simple fast installation,
no walking on existing
roof
Approved by
Marley Eternit and
Landini SpA. Eurosix
10 Year
product guarantee
PV OverRoof System
TM
The only solution for mounting PV onto roofs
PV OverRoof Series II
Main Support Frame
Building Purlin
Building Rafter
Mounting Foot
Solar Modules
Roof Sheet
Pv Support
Beam
Bespoke flashing
system
Approved by
Marley Eternit and
Landini SpA. Eurosix
PV OverRoof System
TM
Simple fast installation, no walking on existing roof
a
Side Elevation
The side elevation shows a
cross section of the
PV OverRoof TM and rafters
b
a
b
CAD design
produced in-house
Bespoke flashing
system
Ease of Installation
Installation of PV OverRoof™ could not be
simpler. The first step (after safety scaffolding/netting etc) is to strip out local areas of
the existing roof sheet exposing the rafters
to be used as mounting points. Note that
this requires no drilling of roof sheet material (especially important for older asbestos
cement sheets). The mounting points are
then attached (via a clamping arrangement –
no drilling or welding required) that will hold
the main support beams (that parallel the
existing rafters). A bespoke flashing system is
then put in place to completely and reliably
seal the roof. The main support beams are
then fastened to these mounts using a simple sliding bolt arrangement in the bespoke
extrusion. Cross beams (that will ultimately
support the panels) are then located using
a similar quick fix sliding bolt solution. The
structure then in place can be safely walked
on to eliminate loading the fragile roof sheets
below. The panels are then secured using a
quick fixing type clip where panels can be
mounted in landscape or portrait depending
on panel size and shading requirements.
PV OverRoof System
TM
The only solution for mounting PV onto roofs
Mounting to Roof
Main support frame direct connection to building rafters. Note: nominally 3 mounting points per rafter at 4m spacing. Note: Roof sheets are replaced where
mounting points are secured. Mounting point includes bespoke water tight flashing arrangement.
Module Mounts
PV support beams (aluminium extrusion) span between rafters – maximum rafter spacing 6.096m (20’). 2 support beams per row of modules, with “bracing” to
support beams. Modules can be either landscape or portrait in orientation
Space between PV modules and roof surface 200 mm*
Maximum loading of mounting system 5,400 Pa (5,400N/m2)
Weight of mounting system – excluding modules approximately 7 kg/m2
Bay size up to 20’ (6.096m)
*200mm spacing can be increased if a design requirement
Equipment Supplied
Supplied as a system comprising PV OverRoof™ structure, modules (with mounting clamps), inverters. A range of accessories (string combiners,
monitoring etc can also be supplied).
Survey and Planning
PV OverRoof™ is available via our authorised agents who offer a full installation
service. Please contact The Solar Building Company for further details.
Tel: +44 (0) 1600 891 557 www.sbcrenewables.com