This moisture is released into the air inside the house from bathing cooking plants laundry and other causes.
Roof without soffit vents.
It makes sense that the wettest spots are near the beam because that s the most likely site for humid air leakage from the indoors.
Without exhaust vents this hot air and water vapor can lead to inferior indoor air quality and cause all kinds of problems from peeling paint to roof damage.
For an attic without soffit vents you may have the option to use gable vents instead.
Venting solutions for roofs with no overhang or soffit install special roof intake venting products that work at the lower edge of the roof decking underneath the first course of shingles.
Some home designs do not have a soffit.
A company called air vent has created a patented product called shingle over edge vents.
They call this a venting drip edge.
However if the home has no soffit it is quite a different matter.
Even if you do not have soffits it may still be a good idea to install a ridge vent even if it s effectiveness is reduced without soffit venting.
It will primarily depend on the roof.
Without adequate ventilation moisture rises with the hot air and forms condensation on the inside of the roof deck.
What about edge vents.
Smart vent a special roof eaves vent product that provides a 3 4 opening about 6 above the top of the roof drip edge.
One great alternative to a soffit ventilation system is to install an intake vent right at the lower edge of the roof.
Where we inspect attics where even larger vent openings are provided in the soffits or eaves if the openings are intermittent we see wet and often moldy roof sheathing on those roof sections where no venting is provided the in between vent roof sections even though at other roof sections where vents are present the sheathing often looks clean and dry.
On the principle that hot air rises the accumulated heat and moisture would rise to the attic and out the roof vents.
When the attic becomes part of the home to be heated and cooled open wall gable vents and roof vents are no longer feasible but the underside of the roof the sheathing and rafters can still get.
With a soffit venting is not much of a challenge.
This is usually a 3 8 inch piece of plywood that is underneath the overhanging portion of the roof that extends beyond the outside wall.
I m presuming that the roof has good eave detailing so that rain does not enter at the beam.
The venting drip edge seems to be the easiest and most common way to go.
However without soffit vents that makeup air comes from indoors a situation that is not desirable in any season.
Exhaust vents exhaust vents are installed at the top of the roof.
