One-Way Weep Vent Installation Guide

A step-by-step guide to retrofitting your One-Way Weep Vent, designed to defend the narrow weep vents from flood water ingress, whilst allowing free airflow during normal conditions.


Step 1: Locate the position of your where your weep vent will be fitted.

Sometimes, this will be replacing an existing weep vent which would let in flood water.

Step 2: Remove the existing vent if applicable. If the existing vent covered the full depth of the outer skin, exposing the cavity, move to step 3.

If your existing vent did not expose the full depth, or you are installing your One-Way weep vent to a different location without an existing vent, you must use a 10mm drill bit to drill a hole all the way through the outer-skin to the cavity.

Step 3: Remove any bur & debris from the area and clean.

Your One-way Weep Vent is designed to be housed in a 10mm diameter gap, If your gap is larger than this due to a previous vent being housed there, you must fill this gap with mortar.

For best results, we advise leaving your 10mm drill bit in position, then carefully pointing the gap, rotating and removing the drill bit once the new mortar has begun to stiffen. Clean your drill bit.


Step 4: Apply a small amount of high quality low-modulus sealant around the shaft of the weep valve, ensuring non is applied to either end blocking air holes.

Place the Valve into the hole, this should be a tight fit to ensure a good seal. Then clean away any excess silicone and leave to dry.