The range of tile and slate vents as well as providing ventilation into the roof void they can be used with mechanical extraction in bathrooms or kitchens or used for soil ventilation.
Slate roof ridge ventilation.
Danelaw offers a wide range of roofing ventilation products covering a wide range of tile types and construction details from new build to refurbishment.
Moreover slates are vapor permeable so moisture problems at the sheathing layer are highly unlikely.
In my judgment you can skip the ridge vent.
If a local code inspector is involved however the code official may not agree with me so keep that in mind.
The v 300 ridge vent is cor a vent s most popular ridge vent for a variety of reasons from ease of installation to its low profile and power nailability the v 300 provides the best value for a ridge vent on the market today.
As you noted slate roofs tend to allow air movement through the slates.
By doing this you get to improve your home energy efficiency and protect the life of your slate roof.
It works equally well under shingles as well as shakes or slate roofing.
Roof vents help moderate the temperatures in the attic therefore in the home too and avoid condensation issues and moisture buildup.
So roof ventilation not only helps you remain compliant with local building codes but also save you money.