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The contents of this install guide are copyright protected and may not be reproduced in any form without prior written consent of CSR. Recommendations and
advice regarding the use of the products described in this guide are to be taken as a guide only, and are given without liability on the part of the company or
its employees. We reserve the right to change product specifications without prior notification, please refer to the CSR website for the latest version of this
document. The purchaser should independently determine the suitability of the product for the intended use and application.
3 Issue: Water or rain leakage
Potential Cause: Insufficient turndowns along the front
edge of the back-flashing due to low roof pitch and
driving rain.
Action: Extend turndown or re-flash
4 Issue: Water or rain leakage
Potential Cause: No back-flashing provided
Action: Extend back-flashing to under sheet above or
roof ridge cap
5 Issue: Water or rain leakage
Potential Cause: Ventilator throat shortened or not used
which allows rain ‘bounce’ to drive water off roof into
ventilator
Action: Install recommended ventilator throat
6 Issue: Condensation Drip (after hours) for ventilator with damper.
Potential Cause: Inadequate make-up air after hours.
Action: Set the damper to an open position to allow air movement during inactive hours where
make-up air could not be provided via open windows shutter or louvres.
7
Reliance upon flexible sealants.
Through expansion and contraction of building components over time, flexible sealants such as
silicon may develop cavities or cracks which then permit water ingress. It is always recommended
that mechanically overlapped seals are created with metal components to provide water protection
and that flexible sealants are used to provide secondary protection. While it is recommended that
silicon be applied over roofing screws - it is more reliable to use high quality blind rivets or roofing
screws with integrated washers.
8
Failure to Use Ventilator Throat.
It is crucial that the ventilators are installed with a Varipitch to ensure the turbine has adequate
clearance from the flashing. Failure to comply with this recommendation could lead to rain ingress
through the vanes resulting in leakage.
