Using an A15 channel in a driveway
A15 is a pedestrian-only load class. Installing it in an area where vehicles will cross the channel risks structural failure. Always use a minimum B125-rated channel for residential driveways.
No fall in the drainage run
A channel run with no gradient will pool water and leave silt deposits throughout the run rather than directing them to the sump point. Most channels do not have a built-in fall — the installer must create a gradient in the installation by setting the channel at the correct level. Confirm the required gradient with the manufacturer's installation guide.
No sump unit at the low point
A sump unit at the low point of the run allows silt and debris to settle out before entering the underground drainage pipe. Without a sump, debris accumulates in the pipework. A sump basket makes maintenance straightforward and avoids blockages.
Incorrect or insufficient concrete surround
Channel drainage systems require a concrete surround to transfer load away from the channel body and provide structural support. Using too little concrete, the wrong mix or leaving gaps around the channel body compromises the installation. Follow the manufacturer's installation guide for minimum surround dimensions.
Connecting to an incompatible outlet size
Not all end cap outlets are the same size, and not all are compatible with all underground pipe diameters. Confirm the outlet size of the channel accessory and the size of the underground drain pipe before ordering — mismatches can require costly remedial work.
Mixing accessory families from different products
End caps, sump units and connectors from one channel family are generally not interchangeable with another. Using accessories from a different product range can result in poor fit, leakage and structural weakness. Always confirm compatibility with Forti Nova before ordering.
Setting the channel too high or too low
The channel grate should be set flush with or just below the finished surface level to intercept surface water effectively. A channel set too high will cause water to bypass it. A channel set too low creates a trip hazard and can trap debris on the grate face.
Omitting heelguard grating in pedestrian areas
In any area where pedestrians use the same surface as vehicles — driveways, car parks, mixed-use areas — a heelguard grate should be specified to prevent heel and bicycle-wheel entrapment. Standard slotted grates are appropriate for vehicle-only areas.