Standing seam vs. exposed-fastener panels
Standing-seam roofs use panels joined by raised, interlocking seams, with the fasteners hidden underneath. Exposed-fastener panels are screwed through the face of the metal, and the rubber washers on those screws age over time. Most homeowners replacing a full roof on a house choose standing seam; exposed-fastener panels are more common on barns, sheds and outbuildings.
Snow, ice and snow guards
Metal sheds snow, which is a big part of its appeal in the Pioneer Valley. That snow has to land somewhere, though. Plan for snow guards or snow-retention bars above entry doors, walkways, decks, driveways and lower roofs, so a full slope of snow does not slide off at once.
Ice is less likely to cling to metal than to shingles, but the basics still apply. An ice barrier at the eaves and a well-ventilated, well-insulated attic matter as much under metal as under any other roof. Our ice dam guide explains why.
Noise, heat and underlayment
Installed over solid roof decking with underlayment and an insulated attic, a metal roof sounds much like any other roof in the rain. Panels over open framing, like some porch roofs, are noticeably louder. Because metal gets hot in summer sun, contractors generally use a high-temperature underlayment beneath it.
Metal roofs in historic neighborhoods
Switching from shingles to metal is a visible change. Inside a local historic district, such as Forest Park Heights or McKnight in Springfield, check with the Historical Commission before you commit to a material or color.
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Call (888) 292-4916Questions to ask about a metal roof
- What panel profile and metal thickness (gauge) are you proposing?
- Will the existing roofing be torn off, and how will the deck be checked?
- Where will snow retention go, and what kind?
- How will chimneys, skylights, walls and vent pipes be flashed?
- How do the panels allow for expansion and contraction with temperature swings?
- What finish and color options are available, and what does the manufacturer say about fading?
- How many metal roofs has the crew installed on homes like mine?
Questions homeowners ask
Can a metal roof go over my existing shingles?
Some metal systems can go over a single layer of shingles where the code and the manufacturer allow it. A tear-off lets the contractor inspect and replace damaged decking and install a proper ice barrier, so ask what the manufacturer and your building department require.
Will snow slide off a metal roof all at once?
It can, which is why contractors install snow guards or snow-retention bars above doors, walkways, decks and driveways. Decide where snow should land before the roof goes on.
Is a metal roof louder in the rain?
Over solid decking with underlayment and an insulated attic, most homeowners notice little difference. Panels over open framing, like some porches, can be louder.