Attic Ventilation.

During roofing replacement, the number one most frequently neglected area of a home is the attic ventilation system. By our estmation, 95% of homes in Portland, Oregon aren’t ventilated up to code.

What does this mean?

  • Energy bills are higher, especially in summer, since more heat is trapped in the home.
  • Moisture is more likely to be trapped inside the home, reducing the lifespan of the roof and other components of the home.
  • Allergens and Radon gas may not be properly removed from the home.
  • Increased levels of backdrafting, which can become dangerous (e.g., when gases such as carbon monoxide is pulled back into the home through a chimney).

A properly functioning intake-outake system is very important not only to reduce energy costs, but to extend the lifespan of a home’s roof as well. We find it unacceptable that other roofers ignore this integral component, so that’s why at NW Home Exteriors we’re fully certified for ventilation work, and our employees undergo comprehensive ventilation training once per year – this way, we’re always up-to-date on current industry standards.

As we all know, heat rises. Having an up to code ventilation system installed and working properly in your home will reduce your energy bills and extend the lifespan of your roof. Ventilation decreases the likelihood that moisture will be trapped in, around, or underneath your roofing components, no matter what time of year it is. In an area like Portland where it rains so often, this can often mean extending your roof’s lifespan by years.

The two main parts to understand about a properly working ventilation system are intake and outtake, meaning the air that flows into your ventilation system, and the air that flows out of it. If either of these systems aren’t working right, your attic ventilation system is actively doing your home a disservice.

In our experience, we’ve noticed that most homes in the area have “80/20” intake/outtake ratios. This can cause many of the problems we discussed above – a properly functioning ventilation system should have an equilibrium as close to 50/50 as possible. This means that exactly half the air coming into the attic should also be going out.

Do you suspect that your attic ventilation isn’t functioning properly? The biggest telltale sign is negative pressurization. This means that air is being drawn into the home when it shouldn’t be – if air is consistently running through your attic or crawl space, you may have negative pressurization. This often leads to lower air quality in the home, since attics and crawl spaces tend to be dirtier and dustier than living areas.

Unlike most roofing companies, whenever NW Home Exteriors replaces a roof, we make sure that the attic ventilation system is up to code and has the proper intake/outtake ventilation ratio.

If you’d like to learn more about attic ventilation and how NW Home Exteriors can help you save money on your energy bill and extend the lifespan of your roof, please feel encouraged to contact us today by calling 503-854-7200.