Trapped heat and moisture in the attic can jeopardize the performance of a new roof.

Improper Insulation can cause:

  • Condensation: Any water vapor in the warm attic air will rise until it reaches the cold
    roof deck area at which point it cools and condenses back to a liquid form, causing:
  1. Wet wood/sagging roof deck
  2. Potential insect infestation
  3. Mold and mildew / Interior damage
  4. Premature failure of roofing materials

Roof Insulation

Attic heat can cause:

  • Shingles will overheat then begin cupping, and premature granule loss occurs exposing
    the asphalt

Allowing an increase in warm attic air will only elevate the temperature of the roof shingles already
being heated by the sun, resulting in a negative effect to its long-term durability.

Proper attic insulation and ventilation work together to extend the life of your roof and avoid a costly
roof repair.

Proper ventilation prevents moisture issues in your attic, premature aging of your roof, and shingle cracking. Roof ventilation will also help maintain a healthy indoor environment.

When warm air from your home meets cooler air in your attic, condensation can occur. Proper ventilation will prevent this by making sure air escapes, prohibiting mold growth on plywood and rafters that can cause structural problems.

We’ve completed roofing projects on homes from Silverdale to Port Townsend using the VentSure Ridge Vent, to help homeowners achieve maximum ventilation for their new roof.

Roof Ventilation and Ridge Vents 1

The VentSure ridge vent installs on the peak of the roof allowing exhaust ventilation all along the roofline – end-to-end. It has a low profile, shingle-over design that blends in with the roof. Once installed, this ridge vent provides exceptional attic ventilation and is almost invisible from the ground.

Roof Ventilation and Ridge Vents 2

Design features include an external baffle and internal weather filter for optimum airflow and weather protection. Less than an inch in height, this molded, high-impact copolymer shingle-over ridge vent permits capping of the ridge with shingles like the rest of the roof.

Roof Ventilation and Ridge Vents - VentSure

Here’s how it works:

  • The external wind baffle directs airflow up and over the vent, creating an area of low pressure over the vent openings, pulling air out of the attic — even when the wind is not 100% perpendicular to the vent.
  • The external wind baffle also deflects rain and snow over the vent, protecting the roof and attic from weather infiltration.
  • An internal weather filter fabric helps trap fine snow before it can enter the attic, and protects against dust and insect intrusion.

If your thinking about getting a new roof on your home, contact Integrity Roofing & Construction today and find out if the VentSure Ridge Vent is the product you need to give your roof a breath of fresh air!

The structural characteristics of both are equivalent, and it’s true that they can be used interchangeably.
However, there are differences that roofers and homeowner’s should be aware of when constructing a
new roof or starting a roof repair.

The biggest difference between the two is how they react when exposed to large amounts of moisture
over extended time periods. With the exception of projects in very arid regions like the Southwest,
roofing panels are routinely covered with rain, snow, and ice during construction delays. It’s here that
CDX has the edge.

CDX roof sheathing

  • When CDX gets wet, it tends to swell consistently across the sheet. It returns to its normal
    dimensions and dries out relatively quickly, and the swelling is usually not enough to affect roof

CDX roof sheathing

  • In comparison, OSB performs like a sponge & takes longer to dry out. When used for roofing,
    this tendency to hold moisture means it can degrade faster than CDX when exposed to chronic
    leaks or on soffits.
  • OSB also tends to swell along the edges when wet. Those edges stay swollen even after the
    material has dried out, sometimes causing the roof sheathing to show through the roofing

CDX vs. OSB roof sheathing diagram

Aside from moisture protection, CDX is approximately 15% to 19% lighter than OSB. While the
additional weight of OSB does not mean increased strength, it does mean that it is heavier to handle on
the job. In addition, OSB’s higher weight means higher thermal conductivity than CDX.

CDX or OSB for roof sheathing

  • The biggest feature for CDX might actually be the homeowners’ perception of higher quality.
    Unlike OSB, CDX actually looks like wood, and is familiar to customers.

At Integrity Roofing & Construction, we only use CDX for all of our roofing projects. Our customers
can be assured that they are getting top of the line products and service.