Thornton Expert Roofing: Impact-Resistant Shingle, Metal & Flat Roof Replacement & Repair

A replacement here starts with a full tear-off. Thornton's mid-roof inspection expects every bit of the old covering gone, and that's when soft plywood shows itself: the city inspects new sheathing before anything covers it. Drip edge at the eaves and up the rakes is a city requirement. Synthetic underlayment covers the deck, valley lining goes in, the starter course runs along the eaves, and each shingle gets six nails, which the inspector checks in photos. Ice and water shield is different: Thornton doesn't require it unless the shingle maker's instructions do, so it's a product choice here, not a code item. We'd still want it in the valleys and around the chimney on most roofs.

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The Front Range sits in the middle of Hail Alley, the stretch of North America that gets large hail most often, and the damaging season runs from mid-April to mid-September. The National Weather Service calls a storm severe once the hail reaches 1 inch. Stones that size knock granules loose and bruise the shingle mat underneath. The first clues usually show on softer things: dented aluminum roof vents, dented patio covers and window screens, and shrubs stripped of their leaves. One Thornton rule shapes how a hail repair gets scoped. Once a job needs a permit (more than 100 square feet), every slope with damaged shingles has to be replaced in full. Half a slope isn't allowed.

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Impact resistance is rated under UL 2218, which has four classes. For Class 4, a 2-inch steel ball is dropped from the height that gives it the same energy as a 2-inch hailstone, and the shingle fails if a crack or tear shows on its back. Crushed granules on top don't count as a failure, so a Class 4 roof can still look scuffed after a big storm. Think of the rating as a crash test: it tells you how the shingle did in a lab, not how your roof will look after a June storm. Architectural shingles, also sold as laminate or dimensional shingles, are thicker than 3-tab and outlast it. Colorado's Insurance Commissioner tells homeowners replacing a hail-damaged roof to ask their insurer what premium discounts or future deductible savings a hail-resistant roof would earn. Make that call before you choose a shingle line.

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Standing seam runs in steel panels from eave to ridge, with raised, locked seams and the fasteners hidden underneath, so there are no exposed screws to work loose. Snow slides off it. That's good for the roof and bad for whatever is under the eave, and snow guards over doors and walkways are money well spent. Stone-coated steel is pressed into a shake, tile or shingle profile and coated in granules, so from the street it doesn't read as metal at all. InterNACHI rates metal roofing at 40 to 80 years, against 30 for architectural shingles.

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Tile itself rarely wears out. InterNACHI lists clay and concrete tile at 100 years or more. The underlayment beneath it is the real water barrier, and that's what fails. The fix is to lift the tiles, replace the underlayment and battens, and relay the same tiles, swapping in new ones for any that cracked. Single tiles broken by hail or a careless foot can be changed one at a time. Tile is heavy, so going from shingles to tile can mean extra framing.

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Low-slope sections turn up on a lot of houses: a porch roof, a rear addition, the flat roof over an attached garage. Shingles aren't made for those pitches, so they get a membrane instead. TPO is a white single-ply sheet with heat-welded seams. EPDM is black rubber with taped or glued seams. Modified bitumen is asphalt in rolls, torched down or self-adhered in layers. InterNACHI gives EPDM 15 to 25 years, TPO 7 to 20 and modified bitumen about 20. HomeGuide puts TPO at $4 to $10 a square foot installed, EPDM at $3.50 to $10 and modified bitumen at $4 to $7.50.

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Leaks usually start where something passes through the roof, not out in the open field of shingles. A rubber pipe boot cracks after years of sun, a nail under a lifted shingle backs out, or step flashing pulls loose where the roof meets a wall. Those are small jobs. In Thornton, replacing 100 square feet of roof covering or less counts as a repair and needs no permit. Expect $150 to $1,000 or more for a leak repair and $350 to $1,500 for a shingle repair, by HomeGuide's estimates. Water runs along the deck before it shows up on a ceiling, so the stain is rarely right under the hole.

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When hail or wind opens up a roof, the first job is keeping water out. Colorado's emergency management office tells homeowners to cover any holes in the roof straight away. A proper tarp runs over the ridge and is held down with wood battens screwed through it, never with bricks. Keep the receipt. The same state guidance says to save what you spend after a storm and send it to your insurer.

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A good inspection ends with photos and a plain answer: repair, replace or leave it alone. The roofer checks for granule loss, cracked or curling shingles, nail pops, pipe boots, flashing at walls and chimneys, vents, and the attic underneath. After a storm, state guidance is to let only your insurance adjuster and the roofer you've chosen onto the roof, since every extra pair of boots can do more damage. An inspection also earns its keep when you're buying or selling a house with a roof near the 20-year mark.

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Seamless aluminum gutters are formed on site to the length of each run, so the only joints are at corners and downspouts. Guards keep leaves and loose shingle granules out of the trough. Hail dents soft aluminum, so check the gutters whenever you check the roof vents. InterNACHI gives aluminum gutters 20 to 40 years or more.

See Gutter Repair in Thornton, CO for the gutters you have, or Gutter Installation in Thornton, CO and Gutter Guards in Thornton, CO for new ones.

An attic breathes in at the soffits and out at the ridge. Ridge vent along the peak lets warm, damp air escape, and soffit intake vents let cooler air in to replace it. Get the balance wrong and the attic holds heat all summer and moisture all winter. That matters on the Front Range, where winter freezes and thaws daily: from November through March the normal Denver-area high is above freezing and the normal low below it, so snow on a warm roof melts by day and refreezes at the eave by night. Thornton's final roof inspection looks at ventilation along with flashing and nailing.

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Flashing is the sheet metal that keeps water out wherever the roof meets something else. Step flashing is woven in with each shingle course along a wall or chimney, and counter flashing is set into the masonry and laps down over it. Skylights get their own flashing kit around the curb. On a replacement, we'd want new flashing rather than old metal bent back into place. HomeGuide's figures: $200 to $500 to repair flashing, $400 to $1,000 to replace all of it.

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