Home Improvement Questions? Ask a Handyman for Answers
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The triangular area you describe is not required. You have 2 options; you can ventilate the rafter space above the insulation by using a ridge and soffit vents or you fill the rafter space with insulation and seal it tight so no moisture from the living space can penetrate into the space. The best method to achieve the later is to us spray foam insulation filling the space. Even if you use the former you still need a tight vapor barrier to keep conditioned air from penetrating the rafter space.
Ventilating the rafter space above the insulation (at the roof sheathing) using ridge and soffit vents with a good vapor barrier towards the conditioned space. If that's not an option then filling the rafter space with spray foam insulation. The first option is less expensive if you have ridge and soffit vents in place. If you don't the I'd go with the second option.
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