How To Look At A House
McGarry and Madsen's home inspection blog for buyers of
site-built, mobile/manufactured and modular homes
What are those metal boxes on the roof?
Saturday, August 25, 2018
Most of them are for ventilation. The largest boxes are attic vents and work in combination with vent openings in the soffit (underside of roof overhang) to utilize the natural convection flow of rising hot air, which is pulled in through the soffit vents and flows out at the attic vents near the ridge of the roof. It’s a passive system that provides continuous removal of hot air from the attic on warm days. Other rectangular vents could be for a clothes dryer, range hood fan, or bathroom exhaust fan. Here’s a roof photo with examples.
Also, see our blog post What are the pipes on my roof?
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To learn more about roofs and attics, see these other blog posts:
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