Fresh outside air is taken in either through soffit vents or in through the system itself. This cooler air rises from these intake points and mixes within the ceiling or building space to create a natural flow of air that leaves the hot air escaping through the top of the ridge/skillion. Simultaneously, a positive airflow also crosses over the ridge of the house creating a negative pressure which pulls air out from the ridge vent. Effectively, two thermal effects create a continuous flow of air allowing cool air into the roof/building space and extracting hot air.
There are multiple design options based on building type. For large commercial and industrial sheds we recommend venting the entire top ridge section, however residential ventilation options can vary depending on design, size and budget.
Unfortunately, no, in a retro-fit scenario, new ridge capping would needed to allow the system to work, however, the new ridge capping can be molded into existing ridging seamlessly. This means only parts of the roof where Vent-A-Roof is installed would need replacing.
Like for like on new installs, Vent-A-Roof is a cheaper alternative to traditional rotary vents. However, this comparison is apples and oranges. Each install can be tailored to each client’s budget or airflow requirements.
The ceiling space of a home can rise to 70 degrees on a 35-40 degree outside temperature day. Vent-A-Roof can drop this temperature down to external ambient temperature under the right wind conditions. This decreases the overall heat of the roof space, lowering the internal living space temperature – essentially reducing the need to run costly air conditioners.
Absolutely it will work. You are describing what is known as “saw-toothing”, which means the panels are staggered (mostly a hip sheet condition) . There are several potential causes of this condition but we will not address them here. The waterproofing foam in the Vent-A-Roof products is 12mm wide. If the saw tooting is worse than 6mm, we recommend re-cutting the sheets to make the sheets straight, keep in mind to make a weather-tight seal, the sheets need to embed in the foam a minimum of 3mm. Vent-A-Roof does have a little “play” allowing you to push and pull the vent section to conform to slightly “out of square” sheet conditions. It is vitally important that Hip cuts are very straight, this will make intersections easier to negotiate.
No, you cannot use a standard roll top or 3-Break ridge. The ridge will need to be rolled to create an airgap of a minimum 25mm on the top of the ridge cap. Your preferred supplier/Roll former will be able to roll this for you. Our order form which is located on our website makes the ordering process very simple.
Vent-A-Roof louvers have been tested to 177 kph wind driven rain. The results were flawless. To make the test even more difficult to pass, we had Vent-A-Roof louvers with a 5 Degree pitch and made certain that we included a “louvre joint,” where two pieces of Vent-A-Roof louvre came together. We hold test data of this exercise available to the public.
As per our Technical Data Sheet, Screw Spacings – Each join must have screws installed at the ends of louvre, both, top and bottom using a 12x25 Metal Tek Screw. Corrugated Roof sheeting to be fixed every 4th Rib. 5-Rib roof sheeting to be fixed every 2nd Rib. Concealed Clip roof sheeting to be fixed every Rib.