Forticrete has developed a new, innovative Roof Window System which guarantees the installation of a roof window as low as 10°, lower than the pitch of most traditional roof window systems which is typically 15°.

Designed primarily for single story extensions, the new Roof Window System features a two-piece drainage system which prevents water ingress; giving roofers and builders the confidence to design and build low pitch roofs down to 10°. The new system is supported by a guarantee when installed with Forticrete’s Centurion® low pitch roof tiles.

To celebrate the launch of the innovative system, Forticrete is offering all stockists of its Centurion® tiles an extremely preferential rate. In addition, new stockists will also benefit from a generous discount.

John Lambert, general manager at Forticrete, commented: “Incorporating a low pitch roof design on an extension and renovation enables the homeowner to maximize the space under the roof. But creating natural light at low pitches does present some challenges. Conventional roof windows and flashings allow water to run over the face of the roof tiles and seal the side flashings with foam strips, which can lead to water ingress.

“We have invested significant time and resource identifying the associated problems and developed a new system which guarantees to overcome these inconveniences. Our new two-piece drainage flow system allows water to run underneath the tiles and disperses across the trays, over the fascia and into the gutter in a much more controlled manner.”

Forticrete has also developed a much simpler and more practical installation method for the new window system whereby roof felt is fitted from the outset, ensuring the roof is weather proof even before the window, tray system and tiles are fitted.

The new Roof Window System is competitively priced to reflect its innovative design, performance and ease of installation.

With a 10 year product integrity guarantee, the Roof Window System comprises an eaves and window tray, a fixing kit including supporting battens and an underlay support tray, a Fakro FTP-V U3 Centre Pivot Roof Window (size 02 55 x 98 cm), Fakro roofing felt and Forticrete’s Centurion® low pitch interlocking roof tiles.

Capable of being laid to a rafter pitch as low as 10° degrees, the specialist design of the Centurion® tile provides a highly effective barrier against the elements, making it the ideal tile solution for low pitched roofs, particularly for single storey extensions with restricted height constraints or new build projects with a low pitch design. It is available in five colours and a full range of dry fix fittings to suit all applications.

For more information on Forticrete’s Roof Window System, visit