ROOFING / HOMEOWNER GUIDE
Roof ventilation: what should your estimate include?
“Ventilation as needed” leaves a lot unanswered. Ask what the roofer checked, what will change and whether the price covers the whole job.
By ProjectSide · October 21, 2026
Start here.
A useful ventilation estimate names the existing intake and exhaust paths, the proposed changes and the reason for them. More vents are not automatically the answer to an attic moisture problem.
Ask what the roofer has actually checked.
Request a description of existing intake and exhaust paths, any blocked openings and the attic conditions observed. The right approach depends on how your roof and attic are built. Do not assume adding more visible roof vents is automatically the right answer.
Which roof vents and related work are included?
Have the bid name the ventilation products, quantities or layout, and any changes needed around soffits or existing openings. Ask which old vents will be removed or retained. If another trade must move an obstruction, identify that responsibility before signing.
Connect the proposal to the roof system.
Manufacturers provide installation guidance for their products. Ask the roofer which guidance and applicable requirements inform the ventilation plan. A generic line item cannot show whether the proposed pieces are intended to work together.
Do not treat every moisture symptom as the same problem.
Staining or dampness deserves investigation. Ask whether the observations suggest a roof leak, condensation or another source, and what evidence supports that assessment. A ventilation quote should not silently substitute for diagnosing water entry.
Compare what will be left at completion.
Request photographs or another record of the completed work, where practical, and any maintenance instructions. If two bids specify different ventilation approaches, ask each roofer to explain its design. You can compare documented reasoning without having to design the system yourself.