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Extra Aqua Flat Roofing Vents

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£10.18 Incl. VAT
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Product Description

Manufactured in polypropylene, the base being finished in grey, the dome cover in white. Dome fixed to base with screw into self-locking brass insert.


  • Height 197mm
  • Diameter of base 267mm
  • Diameter of aperture at base 184mm

Each Extra Aqua Vent can ventilate an area of up to 36m2

Method of fixing
Each Extra-Aqua-Vent can ventilate an area of up to 36 square metres and will bond perfectly to asphalt, bituminous felt and plastic roofing materials. For felt roofing, first cut a hole approximately 210 mm in diameter through the base layer. It may also be necessary to cut a hole through the insulation to aid ventilation. Place the vent over the hole and dress subsequent layers of felt up the neck of the vent. The final layer of felt should then be dressed around the neck of the vent so that the domed cap provides a weatherproof cover. For Asphalt Roofing, the sheathing felt should be cut and the vent positioned, as per the felt roofing instructions. The asphalt should then be applied over the base and allowed to cool and set. Subsequent coats of asphalt should be dressed up to the neck of the vent, to within 13 mm of the vent holes. Solid fillets of asphalt should then be formed at the base. The vent requires no further fixing, as the waterproofing medium will hold it securely in position. Finally, secure the domed cap with the brass screw provided.

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Questions & Answers


does it work with grp ?


Yes but you would need to scuff up the flange to help the GRP bond to it.


Converting garage to residential. There are twelve jousts in the garage. Have been told I will need 24 vents .one each end of each joist... Is this correct


These vents can each service an area of up to 36m2 so I do not think you would need as many as one per joist, but more you can ventilate the better.



Will this work with EPDM


Yes, you would need to use the EPDM contact adhesive to dress the membrane over the flange of the vent.


I do have flat roof on my extension, approximately 40 sqm. How many of these vents are needed for effective ventilation


I would say 2 or 3 of them would provide adequate ventilation.


What free vent Area does this achieve?



Product Reviews

5 / 5 5 reviews
peter laws
25th January
Perfect size
Stubbington Roofing Ltd
22nd October 2020
Does exactly what it says on the tin :-)
Stephen Stally
26th August 2020
Fantastic and done the job
Roy Childs
15th July 2020
I siliconed it to the surface of a Lexan roof and it work well, a fraction of the price of a purpose made one.
Mr Steven Dickinson
8th February 2020
excellent vent for flat roof large hole for air to move
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Extra Aqua Flat Roofing Vents

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