I bought a 30 year old house with absolutely NO ventilation in the
attic, which is about 1000 square feet.
This summer, I spent a few days with a hole saw drilling into the
soffits. Every 4 feet, I drilled three holes (two and a quarter inch
diameter) and covered it with a vent. This had to go not only through
the vinyl, but also through a wooden soffit that was underneath the
Then, in the attic, I inserted and stapled styrofoam baffle vents into
the eaves where I had drilled the holes allowing for the air to come
through. All tested OK as cool air came through.
Questions - for the size of the attic, was this enough, too much, or
too little ventilation? My brother in law is a contractor, and he is
coming in shortly to do the ridge vent, presumably along the entire
length of the house.
AND, I was only able to vent about 75% of the soffits to date, as some
of them were too high for me to use a ladder safely (prone to vertigo!)
Should the entire perimeter of the attic be vented? At present, all of
the shadier side of the house is vented, with about half of the sunnier