High level vents are located externally 200 – 225mm below the soffit or roof barge. Low level vents should be installed below the DPC where possible at ground level. At this level, it doubles as a drain for the cavity as well as a vent. If the cavity is bridged or closed at intermediate floor levels, cavity venting and drainage should be provided above and below the floor plate.
Identify the location at which you need to place the vent. A 25mm hole is cored typically at 750mm centres at both high and low levels. Advice in regulations or from guarantors should be followed.
The vent has been designed to be installed at a slight angle (2.5 degrees), to minimize any wind-driven rain entering the cavity. Therefore, the hole is drilled through the external leaf with the drill inclined slightly upwards. It is recommended to use a drill with a depth setting as to avoid any damage to the internal leaf, insulation or breather membranes.
Insert and align the DrillVent into the hole and tapped into place using a rubber mallet. DrillVent should finish flush with the wall surface.