Ventilation is an important roofing component; however, there are some designs that do not include an eaves overhang. This can be a problem since a conventional system requires an overhang to serve as an intake. There is an innovative system that allows for proper air intake without the necessity of an overhang which is done by combining the drip edge and ventilation into one device.
Roofing ventilation is important for the longevity as well as the efficiency of a house or building. Without air circulating freely through the layers of a topside covering, heat and moisture can prematurely damage underlying components such as the underlayment, sheathing, insulation, etc. and result in costly repairs. Heat can also accumulate under the sheathing and cause it to penetrate through the insulating material and into the living space.
Overhangs and Ventilation
In a conventional set-up, air intake starts at the bottom of the roof which is also known as an overhang. A small opening parallel to the ground serves as an inlet for air to enter. During hot weather, the warm air naturally rises. As air heats up underneath the sheathing, it rises and exits through the small opening at the gable or ridge and in the process, the overhang opening draws in air. This process continuously cools down the housetop.
For designs without overhangs, it can be difficult to find a place to position an intake opening. An opening can be created along the fascia, but that means the drip edge will be omitted. The only solution is to join the two components together.
Drip Edge Vent
The system, called a drip edge vent, is similar to any other drip edge except that it has a similar profile to an overhang. The top end starts a few inches over the sheathing and overhangs by a couple of inches before folding and connecting to the fascia board underneath. The overhang has small holes which allow for just the right amount of air to permeate.
When installing this system, the sheathing should not extend all the way to the fascia; there should instead be a few inches of gap between the two to serve as an air passage. The underlayment should then extend to the top end portion of the vent as well as the shingles.
Building designs that do not come with an overhang can greatly benefit from drip edge vents because it combines the two systems into one, minimizing building time and labor costs. The material comes in either vinyl or aluminum and usually cost from $2.00 to $3.00 per foot, which makes it a very affordable option. The design of a drip edge system is also non-obtrusive, so it can be installed without altering the design of a structure.
In conclusion, a drip edge vent is truly an innovative system and can improve roof ventilation. It allows for design freedom without compromising the permeability of the topside covering, making it less prone to damage and repair. It is easy to install and cost effective. Hopefully this article has effectively highlighted the drip edge vent system, its application, and the many benefits of this innovative design!
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Do you need a Houston roofing repair company who can help with ventilation needs? Call the experts at Schulte Roofing at 800-367-7663 who assist the greater Houston area with many roofing needs!