Screw-down vs. standing seam metal roofs: which is right for your Maine home?
For most Maine homes, standing seam is the better long-term roof. Its fasteners are hidden under the panels, so there are no exposed screws to loosen or leak, and it typically lasts 40 to 60 years. Screw-down metal (also called exposed-fastener metal) costs less upfront and works well on barns, garages, camps and outbuildings. The trade-off is maintenance: its screws need checking and eventually replacing.
Here’s how the two compare, and how to decide which fits your home and budget.
What’s the difference between screw-down and standing seam metal?
The difference comes down to how the panels are attached.
Screw-down metal panels overlap side by side and are fastened straight through the face of the panel with screws. Each screw has a rubber washer that seals the hole. You can see rows of screw heads across the roof.
Standing seam metal panels are held down by clips hidden underneath. The panels lock together at raised seams that run from the ridge to the eave. No fasteners go through the face of the panel.
That one difference drives almost everything else: cost, upkeep, lifespan and how each roof handles a Maine winter.
Cost: screw-down is cheaper upfront
Screw-down metal is the more budget-friendly of the two. The panels cost less, and installation goes faster.
Standing seam takes more material, more specialized equipment and more labor, because each panel is measured and formed to fit your roof. For a typical Maine home, standing seam runs about $20,000 to $40,000. Your price depends on the roof’s size, pitch and complexity, and we’ll give you a line-by-line estimate after looking at your roof.
The upfront price isn’t the whole picture, though. Over the life of the roof, maintenance and lifespan matter just as much.
Maintenance: the exposed screws are the weak spot
Every screw on a screw-down roof is a hole through the metal, sealed by a small rubber washer. Over the years, two things happen:
The washers wear out. Sun, cold and Maine’s constant freeze-thaw cycles dry out and crack the rubber.
The screws work loose. Metal panels expand in summer heat and shrink in winter cold. That movement slowly backs screws out of the wood.
Either one can let water in. Plan to have a screw-down roof checked every few years, and expect to replace screws at some point during the roof’s life.
Standing seam avoids this problem. The hidden clips let the panels move with temperature changes without loosening anything, and there are no holes in the face of the panel for water to find. It still benefits from an occasional inspection, but there’s far less to keep up with.
Lifespan: standing seam lasts longer
Screw-down metal: around 30 to 40 years for the panels, with screw maintenance along the way.
Standing seam metal: typically 40 to 60 years with minimal maintenance.
Panel thickness plays a part too. Screw-down panels are often thinner (29 gauge), while standing seam is usually 24 or 26 gauge, which is thicker and stiffer.
How each one handles Maine weather
Snow and ice. Both shed snow well, which is one of metal’s biggest advantages here. Snow sliding off a metal roof can be heavy and sudden, so we often recommend snow guards above doors, walkways and decks. Under both types, we install ice-and-water shield along the eaves (a waterproof membrane that blocks water from ice dams).
Salt air. On the coast, salt speeds up corrosion. Exposed screws and their washers take the brunt of it, which is one more reason standing seam is the stronger choice for waterfront and island homes.
Wind. Standing seam’s interlocking panels and hidden clips hold up very well in high wind. Screw-down roofs can also perform well, as long as the screws are tight and in good condition.
Which one should you choose?
Standing seam is usually the better fit if:
It’s your primary home and you plan to stay for a long time
You live on the coast or near salt water
You want the lowest upkeep and the cleanest look
You’d rather pay more once than maintain the roof over time
Screw-down metal is often a good fit if:
It’s a barn, garage, shed, camp or workshop
Budget is the main concern
You don’t mind periodic screw checks and replacements
If you’re still weighing metal against shingles, read our post on asphalt vs. metal roofing. For more on how metal holds up near the water, see metal roofing on the Maine coast.
Frequently asked questions
Is screw-down metal roofing good for a house?
It can be, especially when budget matters most. It’s a durable, weather-tight roof when installed well. The trade-off is maintenance: the exposed screws need periodic checks and eventual replacement. For a primary home you plan to keep for decades, most homeowners find standing seam is worth the extra upfront cost.
How often do screws on a metal roof need replacing?
It varies with sun exposure, temperature swings and installation quality. Many screw-down roofs need screws tightened or replaced at least once during their lifespan. A quick inspection every few years catches loose or worn screws before they cause leaks.
Does a metal roof make noise in the rain?
Not much, when it’s installed over solid roof decking with underlayment, which is how we install residential metal roofs. The noise people remember usually comes from metal fastened over open framing, like on a barn.
Can a metal roof go over my existing shingles?
We tear off. Removing the old roof down to the deck lets us find and replace any soft or rotted wood and install new underlayment and ice-and-water shield, so your metal roof starts on a solid base.
Thinking about metal for your home?
Every roof and budget is different. We’re happy to come take a look, walk you through both options, and give you a clear, written estimate. Reach out here and let’s talk about your roofing project.
