commercial metal roof with roof ventilation system

The right ventilation method is an essential consideration to have for any new home roofing work. Ventilation boosts the home’s functionality in terms of energy expenditure, durability, and general efficiency.

Metal Roof Ventilation Aspects

Once hot and moist air touches the colder roofing layer, condensation may happen. It’s exactly like placing a chilled drink in a can getting all wet with condensation during hot weather. The same thing applies to your home’s exterior. If you have an exposed area to air e.g. your loft or a big solace between the roofing layers and the deck below it, there is a high risk of condensation.

You can treat condensation in two ways: ventilation or added insulation. In a few words, think about your cold drink in a foam cup for a few seconds–it rarely if ever condensates because of extra insulation.

Ventilation’s role is to allow the heated and humid air to escape before it leads to condensation. It’s necessary to allow any trapped warm and humid air that passes through your attic area to escape before it reaches the underskirt of the roof’s structure. Humidity in a roofing space often leads to an array of undesired issues such as mildew, mold, and condensation which can dampen and weaken insulation lines and walls.

Proper metal roof ventilation also yields other benefits–an additional benefit is the adjustment of extreme temperatures from outside to inside the home and the enhancement of air clarity and health for the residents. Another benefit of ventilation is that it gives your home’s energy efficiency a boost.

How Does Ventilation Operate?

As they taught us at school, heat goes up. In buildings, warm air accumulated in the interior of open space will try to go up to the highest level of the building, which is often the ridge. This is the reason why air fans are used near the upper level of the roof to enable the trapped warm air to escape as it goes up by default. Once the warm air escapes through the fans at the upper layer of the building, the cooler air is drawn in from vents placed in lower levels of the structure e.g. at the eave or near the soffit.

In the following video, you can see the motion of cool air derived from the lower levels and warm air escaping from the top levels.

Due to the fact, the air escaping the ridge must be continuously sourced from the lower eave or soffit levels, an essential factor for any proper metal roofing work is ensuring that the amount of air that comes in and the amount of air that comes out are equal. Venting elements are typically determined in regards to net free airing area which is typically indicated as a total square”.

The necessary amount of ventilation for your house or roofing work varies based on the size of the building. We, therefore, suggest speaking to an HVAC expert for your next roofing project.

There are two primary types of venting for metal roofs: gable vents and ridge vents.

Ridge Vents

Low-level ridge fans are almost undetectable from non-vented units and often match the architectural design of the roofs, blending seamlessly with the total development shade, form, and exterior.

Venting units are installed on the metal roofing layers and shielded with a ridge cap layer. Typical ridge vents stretch usually 10-ft lengthwise and are mainly applied to industrial and rural buildings.

These units belong to the total building ventilation system and are used in tandem with fans and other construction units such as adjustable dampers, allowing high amounts of warm air to get out.

Gable Vents

Gable vents are considered to be a top gable class and work as a receiver or exhaust unit (based on the total venting structure). Gable vents apply typically to residential buildings, along with low-level ridge venting systems.

Inflow venting

Besides gable vents, soffit, and drip edge vents, vents can also work as inflow vents for both gable and ridge venting structures aimed at cooling down the hot air that escapes the construction through the top vents.

Make sure that you consult your contractor and ask more about the procedure to ventilate your roof. A tightly fitted and aired metal roof will last for a few decades and will offer you a solid, secure, and effective roofing solution.