Ventilation

Technically yes, however because it is not usually possible to access, dismantle and clean a roof ventilation terminal of any build-up of grease etc, we would not recommend it.

We would not recommend this as it is likely that high levels of moisture in the form of vapour would flow under the tiles in the courses above and condense on the underside of the tiles, battens and wall facing material.

This will depend on the opening area equivalent. At the eaves, it will be either 10,000mm² per metre or 25,000mm² per metre of eaves and 5,000mm² at the ridge or on both sides of the ridge depending upon the situation. The calculation is:            area opening

Warm roofs generally do not require ventilation as there should be an Air & Vapour Control Layer (AVCL) or vapour barrier on the warm side of the insulation to prevent the passage of warm moisture laden air to the colder uninsulated parts of the roof.

Ventilation openings can be provided at the eaves over a fascia, through a soffit or at a brick corbel, at low or high level through the roof surface using slate or tile ventilators, or high level using a mechanically fixed dry ridge system. The actual

No good quality roof vents leak when installed correctly. If a slate or tile vent is suspected of leaking, the circumstances should be considered. It is possible for rainwater and condensation to run down the roofing underlay and drip though the opening cut into the

This depends on the individual product. All of our slate and tile roof vents are designed to suit the minimum pitch of the slates or tiles that they are intended to be used with.

The Danelaw HD 10/10 plain tile ventilator is designed to carry small cuts of the same tile that is being used on the roof, and therefore is not visible on the completed roof except for the small black ventilation slot that must remain exposed.

Generally, the airflow is restricted by the length, size and straightness of the ducting being used, and the adaptor that connects the pipework. We can only quote the pressure resistance created by the baffles and louvres in vent design. The extractor fan should be selected

Yes, a hole that corresponds with the rear spigot or aperture of any vent should be cut in the sarking board when the vent is being used to deliver ventilating air into the roof void. The underlay should be cut and dressed around the opening

No. This is something that we have considered, however all universal designs are a compromise and usually considered quite unsightly when installed. We do offer a wide range of discreet flush fitting tile ventilators to suit most applications.