Do you need to vent a garage roof?

I've got a few quotes for a new garage roof which seem reasonable, but the one I was going to go with is suggesting putting in some vents while the other two aren't. Why is that?

Asked by Kamil on 21st Jan 2026
Expert Trade Answers
"Yes, you absolutely need to vent a garage roof to prevent heat and moisture buildup, which causes mould, rust, and premature roof material decay, even in unheated garages; proper ventilation creates airflow to remove humidity from activities like car use, and helps regulate temperature, protecting your roof structure and making the space more usable."
Answered on 21st Jan 2026 - Member since Apr 2021 - report
"The majority of garage roofs do not need ventilation as it should have an natural air flow getting in from somewhere but it's important to have ventilation to stop mould and moisture building up or when it gets too hot for heat to escape so it doesn't damage any of the other materials so it lasts longer but to give an opinion I would have to have a look at the at the Roof to know what would be best hope this helps kind regards, John"
Answered on 21st Jan 2026 - Member since Jul 2020 - report
"Vents won't hurt preventative especially if you have electrical appliances in there"
Answered on 21st Jan 2026 - Member since Apr 2020 - report
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