Breather Vents

Areco provide high-quality flat roofing materials, including flat roof vents and breather vents. Our flat roof vents are available in spun aluminium and polypropylene. We also specialise in bespoke fabrications, such as aluminium copings.

Don't hesitate to call us on 01922 743553 to discuss your roofing needs.

Preparation for Flat Roof Vents

Installing flat roof vents on new roofs

Moisture is present in most roofs. A newly screeded concrete deck takes a long time to dry out thoroughly and when the deck is waterproofed, residual moisture from the screeded concrete is trapped with no means of escape. The installation of roof ventilation, such as breather vents and flat roof vents, in the waterproofing layers of the roof allows this trapped moisture to escape, thus alleviating the problems caused by:

1. Blisters in the asphalt or felt roof covering.
2. Expansion and contraction stress on the weathering membrane.
3. Subsequent ceiling level condensation.

Installing flat roof vents on existing roofs

Where an existing roof covering has failed and moisture has penetrated the roof structure, flat roof vents and breather vents should be installed with the replacement waterproof membrane (felt or asphalt) to improve roof ventilation. They will assist in clearing the excess moisture and continue to act in relieving vapour pressure subsequently.

Damp timber roof decks still require any repairs to be completed before re-roofing commences. For felt roofs, the performance of the flat roof vents will be improved by the use of a proprietary partial bonded base layer or a vented felt. Both provide a better flow of vapour laden air to the flat roof vents.

Installing Flat Roof Vents

For flat roof vents and felt roofing

A hole should be cut in the base layer and insulation, diameters as follows:

• Extra Aqua Vent 210mm
• Aluminium A. Vent 180mm
• Aluminium Mega Vent 180mm

Place the flat roof vent base over the hole and dress subsequent layers of felt over the base and up the neck. The cap can then be secured to the base.

For flat roof vents and asphalt roofing

Place the flat roof vent base in position and trim sheathing felt around the base plate. Apply minimum two coats of asphalt over the box and dress around the neck of the flat roof vent. The vent cap can then be secured to the vent base.

Priming of the flat roof vent bases in contact with the waterproofing membrane is recommended