Flat Roof Breather Vent

Flat Roof Breather Vent | Cold Deck Ventilation Solution

Controlled Airflow to Reduce Condensation

The Flat Roof Breather Vent helps maintain airflow within insulated cold deck flat roofs, reducing the risk of condensation and trapped moisture that can damage insulation, decking, and roof structures over time. Once installed, it allows moisture vapour to escape safely, helping protect the roof build-up from rot and long-term deterioration.

Suitable for use with most single-ply and multi-layer flat roofing systems, including EPDM, the vent sits flush with the surrounding surface for a clean, unobtrusive finish.

Proven Waterproofing Detail for EPDM Roofs

The vent is mechanically fixed through the flange directly into the roof decking. The EPDM membrane is laid over the vent and cut centrally, then sealed using EPDM primer and uncured Elastoform tape around the vent pipe. Firm pressure with a silicone seam roller ensures a durable, watertight seal at the penetration point.

For correct installation, 9-inch uncured Elastoform tape and EPDM primer are required but not included. Sealing the base after fixing is essential to protect the membrane and achieve a secure, flush finish.

Specifications

• Pack size: 1 vent

• Size: 75mm diameter, 270mm height

• Application: Cold deck flat roof ventilation

Installation Summary

1. Fix vent through the flange into the decking

2. Lay EPDM membrane over the vent and cut centrally

3. Prime surrounding membrane and allow to flash off

4. Apply uncured tape around the vent pipe base

5. Roll firmly to complete a watertight seal