Roof replacement
A mile above sea level, an asphalt roof rarely reaches the age printed on its warranty. The sun is stronger, the freeze-thaw swings are harder on fasteners and sealant, and a covering rated for thirty years at sea level often reaches the end of its useful life here years earlier. Knowing what a complete replacement quote includes is how you compare two bids that look nothing alike.
When replacement is the right call
The reliable signals are age and surface condition together. Granules collecting in gutters and downspouts mean the shingle’s protective layer is leaving; curled or cupped edges mean the asphalt underneath has dried out; and a south-facing slope that looks a decade older than the north-facing one is the Front Range signature: the sun did that, and it does not reverse.
On this region’s subdivision housing, the street is also a signal. Coverings installed the same season age on the same clock, so when replacement signs appear on neighboring homes of the same vintage, a roof of that age is worth evaluating even if it has not leaked. Choosing the timing yourself is consistently cheaper than having it chosen for you by a ceiling stain in March.
What a complete quote includes
Tear-off and disposal: how many existing layers come off, and where they go. Code allows at most two layers, so a roof that was recovered once must be stripped entirely this time. Decking: priced per sheet, because the number of soft or damaged sheets is unknown until the old covering is off; a quote without a per-sheet price has left the biggest unknown unpriced.
Underlayment, with an ice barrier membrane at the eaves, required by code here precisely because freeze-thaw at the roof edge pushes water where it should never go. Drip edge, new flashing rather than reused flashing at chimneys and walls, and ventilation, intake at the eaves, exhaust at the ridge, which decides how hot the attic runs and, with it, how long the new covering lasts.
The spread between two honest quotes usually lives in three places: the waste factor on a cut-up roofline, the decking allowance, and what is being reused versus replaced at the flashings. Asking each bidder those three questions puts every number on the same footing.
The Front Range factor
Two climate facts shape every roof decision here. First, altitude: at five to six thousand feet the ultraviolet load is far above sea level, and UV is what dries asphalt and strips granules. It is why identical shingles age faster here than the same product in a lowland market, and why the two slopes of one roof can differ by years.
Second, the daily temperature swing: sunny winter afternoons followed by hard freezes cycle every fastener, sealant strip and piece of flashing through expansion and contraction thousands of times a decade. Replacement work itself needs sustained warmth for the shingles to seal, so the realistic season runs April to October, and quotes gathered in the quiet late winter get more attention than quotes requested at the season’s peak.
Questions that separate two quotes on the same house
- How many layers come off, and where does the debris go?
- Code here allows two layers at most, so a roof that was recovered once already has to be stripped to the deck this time: more labor, and a heavier dumpster. Ask for the layer count the estimator actually observed rather than the one they assume.
- What does one replacement sheet of decking cost?
- Nobody knows how many sheets are soft until the old covering is off, which is why an honest quote prices decking per sheet instead of guessing a total. Without that rate, the largest unknown in the job is simply missing from the bid.
- Is new metal going in at the chimneys and walls, or is the old metal staying?
- Reusing old flashing and sealing over it is the most common reason a new roof leaks in its first year. A mile above sea level the daily temperature swing works every joint, so sealant that looked sound in October can open by March.
- Is the attic ventilation being balanced, or simply put back the way it was?
- Ventilation is a pair: intake low at the eaves, exhaust high at the ridge, sized to match. Exhaust alone pulls warm air up out of the house instead of drawing outdoor air through the attic, which makes ice at the eaves worse rather than better.
- Is an ice barrier membrane at the eaves specified, per code?
- Code requires it here because freeze-thaw at the roof edge pushes water back uphill under the shingles. The minimum is a floor rather than a target: on a low pitch with a deep overhang, running it further up the slope is cheap protection.
- 1 Ridge caps. Worked loose by a temperature swing that happens every single day.
- 2 The field. High-altitude sun dries the covering out from above, faster than the calendar says.
- 3 Valleys. Where two slopes drain as one, and where meltwater runs longest.
- 4 Flashing. Chimney joints, and the line where the garage roof meets the house.
- 5 The vent boot. Rubber cracks early at this altitude, well before the shingles do.
- 6 Eaves. Ice builds at the edge wherever the attic is leaking heat into the roof.