A dumpster in the driveway usually means one thing to the neighbors. Somebody’s shingles finally gave out. What almost nobody on the street realizes is that the house is about to spend a few days more open and accessible than it will be for the next quarter century, and that this short window is the cheapest chance its owners will ever get to make the top of the home safer in an earthquake.
That matters more in Sandy than in most places. Homeowners who line up a roofing company in Sandy for a replacement can ask for seismic details to be handled in the same visit, and the crew behind that link fits the job well. It is a family business with several generations of roofing behind it, working out of West Valley City on shingle, tile and flat roofs for houses and commercial buildings alike, and it holds manufacturer approval for the membranes and coatings it installs.
The urgency comes from the ground itself. The Wasatch fault traces the foot of the mountains along the east side of the valley, past the mouth of Little Cottonwood Canyon and the bench neighborhoods climbing toward it. After the 2020 Magna earthquake, the Utah Geological Survey reported that research now points to that sequence occurring on the Salt Lake City segment of the fault itself, and that shaking from future Wasatch quakes may be stronger than older estimates assumed. A roof cannot stop the ground from moving. It can decide how much of the house comes down with it.
Decisions That Belong on the Kitchen Table
The most important seismic choices happen before anyone climbs a ladder. The first is the chimney. Many Sandy homes from the 1970s and 1980s still have a brick chimney rising above the ridge, often serving a fireplace that has not been lit in years. Unreinforced brick is the classic earthquake casualty in Utah, and the part above the roofline behaves like a tall stack of blocks on a shaking table. When it snaps, it tends to fall through the roof rather than off it.
A reroof gives you three reasonable paths. The brick above the roofline can be braced back to the framing with steel. It can be taken down and replaced with a lightweight framed chase around a metal flue. Or the whole chimney can come out and the opening can be decked over so the roof becomes one continuous surface. Settling which path you want before the bid is written keeps it from becoming a rushed change order on day two.
The second decision is insurance. Most standard homeowners policies leave out earthquake damage, and coverage usually comes through a separate policy or endorsement with its own deductible. Reading your policy now changes how much risk you are comfortable leaving on the roof.
The Day the Sheathing Sees Daylight
Once the old shingles and underlayment are stripped, the roof deck is exposed for the first time since the house was framed. Most people think of sheathing as the board shingles get nailed to. Structurally it does much more. Fastened properly to the rafters or trusses, it acts like a stiff horizontal panel that helps the entire house resist being pushed sideways.
That panel is only as strong as its weakest sheets and its fastening. Delaminated plywood, soft spots around old leaks, gaps in plank decking on older homes, and sheets held by too few nails all weaken it. With the deck bare, a crew can swap out the bad sections and renail loose sheets to the pattern current code expects. Doing the same work later would mean tearing off a perfectly good new roof.
A Look Down Into the Attic
An open roof also offers a rare view of where the roof framing meets the walls. That joint carries the whole weight of the roof during shaking, and in older construction it may rely on a few toenails driven at an angle. Metal connectors that tie rafters or trusses to the wall plates are inexpensive, and installing them is far simpler when the framing is reachable from above.
A roofer will not always be the one to add those connectors, since some of this work falls to a general contractor or calls for an engineer’s input. The roofer is often the first person to see the problem, though, and a good one will mention it while there is still time to coordinate.
Everything That Pokes Through
Every hole in a roof gets rebuilt during a replacement, so this is the moment to make each one sturdier. Evaporative coolers are still common on older homes around the valley, and a full unit is heavy enough to slide off its curb in a strong quake, tearing open the duct opening beneath it. Bolting the cooler to its stand and the stand to the framing takes an hour. If the cooler is retired, removing it closes a leak point and a hazard at once.
Solar arrays come off for a reroof anyway, which makes it easy to confirm that every mount lands in a rafter rather than just the sheathing. Furnace and water heater vents pass through the roof as metal pipe joined by simple slip connections. A sharp jolt can pull those joints apart in the attic, so it is worth having the attic side secured with screws and proper supports while the roof side is being reflashed.
Edges Where Two Structures Move Differently
Walls and roofs sway at different rhythms during an earthquake. Wherever they meet, at sidewalls, dormers, skylights and around the chimney, flashing is the only thing bridging the gap. Brittle sealant and flashing held by a single row of rusted nails can tear free with moderate shaking, and the damage tends to surface months later when snowmelt finds the opening. New step flashing and counterflashing, properly lapped and fastened, give the joint room to flex without opening up.
What Goes Back On Top
The last decision is the material, and weight is the seismic factor that matters most. Concrete and clay tile weigh several times as much per square as asphalt shingles, and that extra mass pushes harder on the walls when the house sways. Tile can still be a fine choice in Sandy, but moving up to it should include a check of whether the framing was built for the load.
Moving down in weight works in your favor twice. An owner replacing old concrete tile with architectural shingles or metal takes a real burden off the structure, which helps during an earthquake and during the heavy snow years that the bench neighborhoods see more often than the valley floor. For a house that sits within sight of the fault line, that might be the most valuable thing a new roof ever does.