Q. I have noticed in your column on many occasions that the topic of roof ventilation comes up. You always recommend using an externally baffled ridge vent.

You should have 1 sq. ft. of roof ventilation for every 300 sq. ft. of attic floor space. This recommendation is for systems that have both low and high vents in a 50:50 ratio.

3. Place chimneys near the roof ridge. The highest point on your roof is also the safest place for things like a chimney or vent pipe to go. Since water and snow run down the roof and collect ...

But the main roof peak, running the length of the house, doesn’t have ridge vents. Instead, gable vents are at each end of the house. The intakes are soffit vents.