Your other options are a roof design without ventilation an issue that is volatile and multifaceted.
Roof without soffits.
A home without fascia needs to have gutters attached by roof straps.
Install special roof intake venting products that work at the lower edge of the roof decking underneath the first course of shingles.
These fixed venting units have a lot of advantages over the other venting options.
This is accomplished by installing insulation to include all of the corners angles and wedges where the attic slope meets the attic floor.
Sometimes the roof needs repair in addition to the gutters but you aren t able to complete both projects at the same time.
For homes without soffits or narrow ones the attic can still be very effectively insulated.
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 advantage is that they re incredibly efficient.
The spaces between the sleepers can probably be detailed so that the roof is vented at the soffit as well as at the ridge see venting a shed roof.
Venting solutions for roofs with no overhang or soffit.
For an attic without soffit vents you may have the option to use gable vents instead.
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.
If your roof lacks eaves you need a substitute for soffit vents.
Sometimes a home without eaves or soffits will use ridge vents.
It must also circulate.
The function of soffit vents for proper ventilation it isn t enough for air to simply get into your attic.
Normal vented air likes to enter the attic lower down near the bottom third of the attic and as it passes through it will exit higher up near the top third of the attic space.
Typically you would have a gable vent on each end of the attic.
They re fitted to the gutter hanger and then they are attached directly to the roof.