Asphalt Shingle Systems
Asphalt shingle is the material most roof replacements in the Evanston corridor use. We install as a GAF Certified contractor, and the underlayment and decking beneath the shingle get the same attention as the course on top.

Full tear-off to bare decking, a new asphalt shingle system, and a written scope before any material goes back down.
Roof replacement is a full tear-off to the decking and a new roofing system, not a patch over one failing area. It is the right call once the deck, the flashing and more than one slope are compromised together. Evanston sits at 6,749 feet, per the US Census Bureau, where ultraviolet light ages asphalt faster than at sea level.
Gregco Roofing & Construction has replaced roofs across the Evanston corridor since 2011. Full tear-off starts with the deck: we expose it, inspect it, and photograph what is underneath before any new material goes down. We document. You decide.
A replacement candidate looks different from a one-spot repair: bald, granule-thin shingles across every slope, a deck that flexes underfoot, or a history of patches that keep reappearing somewhere else on the same roof. Tear-off is what tells the real story — rot and damaged sheathing under the shingles do not show from a ladder or the ground. We document what the deck shows before any new material goes down, so the scope matches the roof we actually found.
Asphalt Shingle Systems, Tear-Off & Decking, Ventilation & Underlayment, and Written Scope Before Price — each explained below.
Asphalt shingle is the material most roof replacements in the Evanston corridor use. We install as a GAF Certified contractor, and the underlayment and decking beneath the shingle get the same attention as the course on top.
A full tear-off takes every layer down to bare decking, so nothing gets covered up. Any damaged or rotten sheathing found underneath gets replaced before a new shingle goes down.
Roof ventilation and underlayment decide how a new system performs, not just the shingle brand. We balance intake and exhaust venting and run Ice & Water Shield at the eaves before the first course goes down.
What tear-off exposes decides the real scope. Materials, decking work and what is included go in writing before we discuss price, not after.
Four steps, always in the same order: on-site inspection, photo documentation, written replacement scope, we do the work.
Wyoming property owners ask 10 questions most often about roof replacement — answered here in plain language.
Lifespan comes down to material, installation quality, and how much sun and freeze-thaw the roof takes on. Evanston sits at 6,749 feet with about 211 clear days a year, per the City of Evanston and the US Census Bureau, so UV exposure runs stronger than at lower elevation. We read the wear pattern on your specific roof during an inspection rather than quote an age that ignores what it has actually been through.
There is no set number, because roof size, pitch, how many layers come off, and what tear-off finds all change it. A single-layer tear-off on a simple roof moves faster than one with multiple layers or decking that needs replacing. We give you the schedule once tear-off shows the actual scope, not before it starts.
Not as standard practice. A layover leaves the deck and any hidden damage covered, which runs against the documentation this company is built on — we cannot show you what we cannot see. Every quote assumes tear-off to bare decking unless the roof and the site visit say otherwise.
Rotten or damaged sheathing gets replaced before any new shingle goes down — a new roof over compromised decking fails early no matter how good the shingle is. We photograph what tear-off exposes and show you the affected area before replacing it, so the added decking work is documented, not assumed. See the full repair-or-replace decision guide.
Weight follows the wind as much as the snow. Evanston sits in the I-80 wind corridor, where winter gusts of 30 to 60 mph are common, per the Wyoming Department of Transportation and the National Weather Service. Manufacturers rate shingles for wind resistance, and a higher-rated product is worth discussing for roofs exposed to that corridor directly.
No. The work happens on the roof and around its perimeter, so the property stays occupied through the project. Expect noise overhead during tear-off and crew activity in the yard and driveway; the interior is not touched unless decking damage already reached the ceiling below before we started.
Coverage depends on the system installed, not on the fact that a new roof went up. Manufacturer terms vary by shingle line and by whether the install qualifies for them, and workmanship coverage is separate again. We tell you what applies to your specific project before work starts, and the website's terms page spells out exactly what that means.
There is no single number, because roof size, pitch, material, how many layers come off, and what tear-off finds underneath all move the price differently. We measure the roof, walk through the material options, and give you a written estimate based on what we actually find — not a range pulled from an average job.
Shingles need warmth to seal properly, so late spring through early fall is the strongest window at this elevation. Evanston's January lows average near 10°F, per Weather Atlas climate normals, and cold asphalt is stiff and prone to cracking rather than sealing. We still work through the shoulder seasons; deep winter is the exception, not the rule.
Debris and fasteners come straight down during tear-off, so we lay protective ground covers and plywood along planting beds, walkways and the driveway before work starts. A magnetic sweep for stray nails runs at the end of each work day, not just at the finish.
WYOMING SERVICE AREA
Roof Replacement is available across Evanston, Kemmerer, Cokeville, Rock Springs, Green River, Mountain View, Lyman — every listed city links to its own page.
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Red pins identify communities where Gregco currently accepts service inquiries. The map is for orientation, not a surveyed service boundary.
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