Roofing, built as part of the whole project

On an addition, a renovation or a new build, the roof gets framed by the same carpenters, vented through the same attic and flashed into the same siding, so Nova frames it, roofs it, sides it and trims it under one contract. The flashing at the tie-in is one company's responsibility instead of a conversation between a framer who has already left and a roofer who was never told what the siding crew is doing next month.

Doing the roof alongside siding or window replacement also shares one setup: the same staging, the same dumpster, the same lift and ground protection, one round of neighbor notice. Two separate mobilizations pay for all of that twice.

Ice dams are the local failure mode: heat escaping into the attic melts snow, the water refreezes at the cold overhang, and the ridge backs standing water up under shingles, which are lapped to shed water running downhill and are not a membrane. The defenses are ice and water shield carried well past the interior wall line, balanced intake and exhaust venting that keeps the deck cold, and air sealing at the attic floor, which is not a roofing item and is exactly why it gets skipped when the roofer is the only contractor involved.

Wind exposure in Rye, Hampton, Kittery and York drives the nailing pattern, starter courses at the rakes as well as the eaves, and hip and ridge selection, and salt air attacks fasteners and flashing metal, so details that would be fine inland get specified differently near the water.

Leaks start at intersections, not in the middle of a roof plane: where an addition roof runs into an existing wall, in valleys, behind chimneys with no cricket, and where a roof edge dies into a sidewall, which needs a kickout flashing to throw water onto the siding instead of behind it. Doing those details correctly means getting behind the siding, so step flashing gets woven shingle by shingle and lapped by the weather-resistive barrier above it, and counter flashing gets let into the wall or cut into masonry rather than surface-sealed.

On material: architectural asphalt is the right answer for most houses here, rated as a system when underlayment, starter, field and ridge cap come from one line, and Nova is GAF certified. Standing seam metal costs more up front, moves with temperature instead of fighting it, and outlasts a couple of asphalt cycles; it sheds snow well, which is why snow guards over doors and walkways get planned before the panels go on.