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Question DetailsAsked on 8/4/2016

who is the best metal roofing contractor in my area?

Dependable quality installation of standing-rib metal roofing.

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2 Answers


AL does not break out metal from non-metal roofers (many do both), so you would have to Search the List under Roofing to find well-rated and reviewed contractors, then either check their profile pages and reviews for mention of metal roofing, or start calling around to your screened list. Or google or yellow pages search for metal roofing contractors and cross-check their names on AL for ratings and reviews.

Be aware of terminology when contacting roofers - "standing rib" generally means the older sheet roofing with multiple ribs in the panel, and almsot always used exposed fasteners at the sheet joints. Also, the sheet joint rib is almost always the same height as the intermediate ribs for consistent appearance across the roof - but may be quite low, so susceptible to leakage if water backs up on the roof.

"Standing seam" generally means a higher edge seam, which is either crimped closed with a crimping tool, or a snap-lock connection - hopefully with a gasket at the interface in either case though not always. Some crimp seam roofs use a seam sealer or caulk, some nothing, so be aware of that - especially if in an area subject to torrential rains or snow/ice damming. Generally more expensive than normal standing rib roofing.

It used to be that standing seam roofing had a standing seam at the edge and smooth panel in between, but it now also comes in wider panels like standing rib, and can have intermediate ribs, so from the ground (without closeup view of seam) it can look the same - or in some cases the edge seam stands up higher than the intermediate stiffener ribs, causing a two-height rib appearance. With the wider panels (generally used now because of fewer seams to potentially leak and to have to assemble), if the product is not fully supported underneath or is (Ughhh) overlaid over shingles or such on firring strips, it should have the reinforcing intermediate ribs. Over board insulation or directly on water barrier over sheathing edge-seam-only product can safely be used, except is generally not strong enough to resist end peelback as well in hurricanes and tornadoes so most manufacturers recommend the ribbed panels in that application.

My recommendation - if you are going to spend the money on metal roofing, go with standing rib with integral gasket and self-locking seams for the most waterproof product. And make sure the fasteners conform to manufacturer recommendations - both with respect to length, and that they have a high-quality (not cheap plastic) gasket on the screws. The flexible buna rubber or EPDM gasketed ones cost only about $100 more for a typical size roof but the gaskets last probably twice as long as plastic or neoprene.

For longer life - concealed fastener systems of course last longer because there is no exposed seal to degrade - though again in high wind areas you either have to use a narrow sheet or risk not enough holding power compared to the mid-panel screw-down sheets. Alternatively, rib-top screws (with a holddown V bracket and gasket) greatly reduce the leakage potential, but are not commonly used on residences except in some ice-damming areas because the screws stick up above the ribs fairly obviously.

Also - stainless screws (if using exposed screw system) will certainly last longer than galvanized, which commonly start rusting right off because of damage in installation - but even if color-matched tend to lose the paint pretty quickly in many brands, so that is a concern if bright stainless screws would be objectionable to you.

Also - the screws in surface screw systems should have cup washers on or built into them - has an upside down cup shape on the metal washer part of the screw that fits over the gasket, leaving only a thin bottom ring of the gasket exposed to sunlight to weather - it the full gasket thickness is exposed it will weather and crack a lot sooner. Look like this -

Answered 3 years ago by LCD



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Answered 3 years ago by Member Services

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