On 10 May 2023, MCS published an update to The Solar Mounting (Product) Standard (MCS 012 v3.0). One of the changes to the Standard included the expansion of scope to include non-mechanically attached mounting systems, in addition to mechanically attached mounting systems, designed for installation on flat roofs (≤ 10°).
Prior to this expansion of scope, installers utilised clause 5.5.5 in The Solar PV Installation Standard (MIS 3002) when installing on flat roofs. This clause dictates that where no MCS 012 certified mounting systems suitable for a given installation exist, a custom designed mounting system may be used subject to two specific conditions being met, so the installation remains compliant.
However, as the transition approached earlier this year (10 May 2025), we received feedback that a number of manufacturers were still in the process of gaining certification for their non-mechanically attached roof mounting systems. As a result, MCS granted an extension to the use of clause 5.5.5 in The Solar PV Installation Standard (MIS 3002). This extension was set to end on 10 November 2025.
Use of clause 5.5.5 extended and MCS 012 to be reviewed
MCS has continued to consult with key stakeholders, including manufacturers, product certification bodies, and the Solar Mounting and Solar PV Technical Working Groups. After considering their feedback, MCS has determined that:
- The use of clause 5.5.5 in The Solar PV Installation Standard (MIS3002) for installers installing on flat roofs will be extended until further notice as manufacturers work through the certification process of non-mechanically attached mounting systems.
- MCS will immediately support the Technical Working Group to review clause 5.5.5 of The Solar PV Installation Standard (MIS 3002) to make it as clear as possible for installers. The outcome of this review will be implemented and communicated in the coming weeks.
- MCS will also review The Solar Mounting Product Standard (MCS 012) to address any challenges manufacturers are facing and so that it sufficiently enables the certification of non-mechanically attached products.
- This extension will continue until MCS has reviewed The Solar Mounting Product Standard (MCS 012) and there are enough flat roof mounting kits that have secured certification for installers to choose from.
Next steps
Our priority is to limit the disruption to installers, and to give them the confidence and clarity they need to remain compliant. For now, certified installers should continue to refer to the current version of clause 5.5.5 of The Solar PV Installation Standard (MIS 3002).
MCS is committed to upholding transparency throughout the supply chain, and we have issued individual updates to all stakeholders affected by these changes. We will continue to work closely with the industry and provide updates as this work progresses.