Category Archives: Attic Ventilation

What Can We Tell from These Photos? (Case Study 20)

Posted by in Attic Ventilation, Case Studies, Shrinkage, Water Sources, Wood | January 04, 2021

When evaluating moisture damage in an attic there may be conditions that appear to contradict each other, such as, those seen in the featured photograph and Figure 1.  However, a closer and more thoughtful examination indicates that the different appearances… Read More

A Pattern of Condensation in an Attic

Posted by in Attic Ventilation, Buying/Maintaining a Home, Winter Concerns | June 18, 2018

The feature photograph shows a view of the ridge in an attic.  Note the discoloration and biological growth on both slopes.  Notice that the discoloration is worse on the slope left of the ridge than on the slope right of… Read More

Does Ventilation Really Provide a Benefit in an Attic?

Posted by in Apparent Mold/Biological Growth, Attic Ventilation, Buying/Maintaining a Home, Winter Concerns | June 04, 2018

The clear surface on the underside of the roof deck around the three bathroom vent pipes shows that even a little bit of inadvertent air flow is capable of reducing condensation and the risk of apparent mold/biological growth. It doesn’t… Read More

Who Says, “You Need to Have a Gutter to Have Ice Damming or Icicles?”

Posted by in Attic Ventilation, Buying/Maintaining a Home, Roof, Water Sources, Winter Concerns | March 12, 2018

See those long, beautiful icicles and the ice dam? But wait – there is no gutter along the rear slope of this dwelling (see Figure 1).  How can there be an ice dam and icicles?  Just lucky, I guess. Note… Read More

When Is Condensation a Concern?

Posted by in Apparent Mold/Biological Growth, Attic Ventilation, Chimneys, Winter Concerns | February 08, 2016

Remember summertime?  It’s that warm or even hot time of year when we lay back on our chaise lounge in the shade with a cold glass of our favorite beverage.  It is so humid that the glass is sweating profusely… Read More

Getting Ready for Winter (Attic Ventilation)

Posted by in Attic Ventilation, Buying/Maintaining a Home, Winter Concerns | August 24, 2015

THAT time of year is just around the corner.  The time when the temperatures drop and the airborne moisture in the attic condenses on the attic framing and the underside of the roof deck causing moisture staining, frost, excessive moisture… Read More

Can Ventilation Really Reduce Condensation and Mold Growth in an Attic?

Posted by in Apparent Mold/Biological Growth, Attic Ventilation, Roof, Wood | August 11, 2014

Most in the construction industry know that the attics of wood framed structures require adequate ventilation to reduce the risk of the condensation of excessive airborne moisture and the resulting mold growth. But, how much does ventilation reduce condensation and… Read More

Some Comments Regarding Soffit (or Overhang) Vents

Posted by in Attic Ventilation | July 21, 2014

Soffit (or overhang) vents provide free vent area for cooler or drier air to enter into the attic and replace the hotter and/or damper air that vents out through the upper vents comprised commonly of a power vent, ridge vents,… Read More