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Whether flashing goes over or under shingles depends on the type of flashing. For example, with step flashing, the shingles go on top, but they overlap one another. So technically, flashing goes both over and under shingles. But generally speaking, flashing goes under shingles and beneath the house siding. And in most cases, you can't see the flashing from the ground.

The terms “roof sealant” and “roof coating” are used interchangeably to describe the rubber, silicone, polyurethane, or acrylic product applied to the roof’s surface for waterproofing and UV protection. Products like roof caulk can also be called “roof sealant,” but the term is more commonly used for the protective coating.

In many cases, yes, homeowners insurance covers roof damage caused by snow. For example, if your roof collapses in a snowstorm or an ice dam leads to a leak in your ceiling, your policy should cover the cost of repairs. However, to get your claim approved, your roof must be well-maintained and in good condition overall, aside from the recent snow-related damage.

Just like when you’re shingling a roof, you can install felt underlayment under a metal roof, but a synthetic underlayment like adhered ice and water shield is the best option. These use adhesives rather than mechanical fasteners, so you have fewer penetrations going through your roof deck and a lower risk of leaks. Ice and water shield is also easier to install because you don’t need additional tools or fasteners to attach it to the roof deck.