20 Year System Guarantee
Permavent offer a 20 year guarantee on its range of pitched roof ventilation products, complementing the ventilation requirements of BS5250:2021, which includes the use of in-roof solar PV panel ventilation in new build, refurbishment and aftermarket projects.
The following must be used to qualify for the 20 year system guarantee:
LR Membrane
Cold roof with integrated solar panels – The Permavent LR membrane must be used in conjunction with high and low level ventilation products and underlay support tray.
Cold roof – If you do not have an airtight ceiling, Permavent LR membrane must be used in conjunction with high and low level ventilation products and underlay support tray.
Warm roof with integrated solar panels – Roof must be counter battened directly on top of the Permavent LR membrane, Permavent 25mm over fascia vents to ventilate the batten cavity, support tray and Permavent universal dry ridge.
Warm roof – Roof must be counter battened directly on top of the Permavent LR membrane, underlay support trays to be used at the eaves and Permavent universal dry ridge (if required).
APEX Membrane
Cold roof with integrated solar panels – The Permavent APEX membrane must be used in conjunction with Permavent 10mm over fascia vents, Permavent underlay support trays and Permavent universal dry ridge system.
Cold roof – Permavent APEX along with Permavent underlay support tray and Permavent universal dry ridge system.
Warm roof with integrated solar panels – Roof must be counter battened directly on top of the Permavent APEX, Permavent 25mm over fascia vents to ventilate the batten cavity, support tray and Permavent universal dry ridge system.
Warm roof – Permavent APEX along with Permavent underlay support tray and Permavent universal dry ridge system (if required).
Guarantee applications must be submitted no later than 1 month after project completion