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Question DetailsAsked on 12/7/2017

benefits of metal roof

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Longer life (typically about twice as long as composition shingles or membrane or more, though unless highest grade oven-baked finish will likely need blasting and repainting about halfway through its life (so about 20-30 years depending on weathering and if organic tree debris fall and sit on it) though if ordered as such totally fireproof (some come with flammable paints, there are fire country rated ones though), generally (if panel as opposed to shingle stype and fastened down with anchors and not just screws) very much higher blowoff resistance, much higher impact resistance, generally more leak resistant, with proper finish can be a significantly cooler roof, can readily be built as a "ventilated" or "double-layer" roof which is MUCH cooler in the attic, and more. Does not hold organics anywhere as well, so staining and moss issues are greatly reduced.

Negatives - typically 50-100% high initial cost which is a major factor for many people, especially if they do not intend to live in the house forever. Aesthetic issues (especially with panel as opposed to shingle type) on appearance and noise in rain and especially in hail. More dangerous to walk on so reduces DIY ability to clean the roof. HIgher runoff velocity so need larger of specially runoff-resistant gutters to avboid the runoff shooting over the edge to the ground. Ice and snow hazards to people and cars parked near house from avalanching, or with much easier ice damming if you use snow guards - and if no snow guards typically avalches off in big slabs which, if not shoveled/snowblown away very soon after coming off, turn to ice berms that can be very hard to remove. Dent and ripple prone if thinner gauges are used. Ripple and swaybacking prone if applied over existing roofing, especially if walked on. Can soemtimes (depending on roofing design) trap moisture coming through from a damp or poorly ventilated attic and cause sheathing rot as the moisture condenses on the cold metal.

Here are links to a bunch of other previous similar questions with links for your info:

Answered 2 years ago by LCD

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