However without soffit vents that makeup air comes from indoors a situation that is not desirable in any season.
Roof ventilation without soffit.
Determine the shape of the hole needed for the vent.
Remove the shingles in the area where the vent is to be installed.
Install special roof intake venting products that work at the lower edge of the roof decking underneath the first course of shingles.
Problems when roof has no overhang.
Intake vents such as soffits are placed lower on the roof usually under the eaves.
The design of many older houses omits eaves which maximizes the amount of sunlight.
Draw it on the roof deck.
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.
They call this a venting drip edge.
Don t install intermittent or occasional or faux soffit intake venting or vents with too little opening area such as we show in the photo at left.
Typically you would have a gable vent on each end of the attic.
The two roof ventilation options intake vents and exhaust vents should be placed to take advantage of the natural increased speed of air circulation.
How to vent an attic with no eaves the function of soffit vents.
Drill a hole inside the shape for the jigsaw blade.
For proper ventilation it isn t enough for air to simply get into your attic.
The venting drip edge seems to be the easiest and most common way to go.
Weird attic layouts may be a part of it.
But if you don t have eaves or if you have shallow soffits like me ventilation can be a challenge.
With old homes it can be very difficult to properly ventilate the attic for a variety of reasons.
If you live in an older home your roof might not be constructed for roof ridge or soffit vents.
Be certain that the hole is between the rafters.
Soffit vents and eaves are placed at the lower extremes of the roof and provide the intake ventilation.
Place the roof vent over the hole.
For an attic without soffit vents you may have the option to use gable vents instead.
Vents at the soffits are intermittent or spot vents or are simply too small.
I m presuming that the roof has good eave detailing so that rain does not enter at the beam.
This occurs through the rising of warm air and the falling of cooler air.
Smart vent a special roof eaves vent product that provides a 3 4 opening about 6 above the top of the roof drip edge.
If i had an older home without soffits i would strongly consider just completely air sealing the attic and adding foam insulation totally removing the need for ventilation.
Here are examples of inadequate intake ventilation.
One great alternative to a soffit ventilation system is to install an intake vent right at the lower edge of the roof.
Venting solutions for roofs with no overhang or soffit.
Ridge vents are used for exhaust or outflow of moisture heat and stale air.
