Many threshold drains are being falsely advertised as universal solutions for all door threshold types. They are marketed as capable of accommodating any threshold construction, whether stepped or level, with their covers set flush with both inside and outside surfaces. However, this notion of a "one-size-fits-all" channel profile is misleading.

In truth, standard channel drains are only suitable for stepped door thresholds, where the drain cover sits lower than the threshold itself. They fail to effectively capture water from modern door systems with weep holes designed to allow water to pass from the tracks to exit at these weep holes. This means they are ineffective for capturing water from the door threshold itself. You need a complete dual-flow drain like our Aqualevel system that completely encapsulates, isolates the door and drain from the building, whilst working with the buildings DPC's and DPM.

Our system captures water from the adjacent paved surfaces and the water that exits from the door threshold weep holes. Additionally, rainwater pipes can be integrated into this system to safely redirect water away from the building, thus preventing structural water damage.

One misconception contributing to the misuse of these standard drains is the belief that they are approved for all door types, as they are often marketed as being compliant with Part M of Building Regulations. However, Part M primarily focuses on wheelchair access and does not adequately address the drainage requirements of door thresholds. This requires a minimum of a 10mm drain slot which is totally ineffective at this location, as this detail fails to collect the water from the door threshold itself.

It's crucial to understand that threshold drains should only be used with stepped threshold details to avoid complications with DPC detailing. The outdated drainage details intended for flush level thresholds are incompatible with modern metal door profiles and weep hole drainage systems. These antiquated methods, such as French drains or slot drains, are not only ineffective but also prone to eventual failure.

Companies that claim simple channel drains can be utilised at this location, irrespective of its name, for flush level access requirements are misleading and fail to fully elucidate the actuality and consequences of such a choice. They rely on the limited knowledge of landscapers regarding the precise reasons why a drain is necessary in relation to the building's structure.