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Almost none will lead with the two things that actually decide longevity: underlayment and ventilation. They're invisible from the curb, but they're 80% of why one roof lasts 20 years and an identical-looking roof lasts 50."}],["$","h2","1",{"className":"mt-10 text-2xl font-bold leading-tight tracking-tight text-ink sm:text-3xl","children":"Underlayment: the layer between deck and roof"}],["$","p","2",{"className":"text-base leading-relaxed","children":"Underlayment sits on top of the structural deck and underneath the metal panels (or shingles). It's the secondary water barrier, the thermal break, and — on metal roofs — the slip plane that lets panels expand and contract without grinding against the deck."}],["$","h3","3",{"className":"mt-8 text-xl font-semibold tracking-tight text-ink","children":"Felt vs synthetic vs self-adhered"}],["$","ul","4",{"className":"space-y-2 pl-1","children":[["$","li","0",{"className":"flex gap-3 text-base leading-relaxed","children":[["$","span",null,{"className":"mt-2 inline-block h-1.5 w-1.5 flex-none rounded-full bg-brand"}],["$","span",null,{"children":"15-lb felt: cheap, absorbs water, tears easily, falls apart in UV. Avoid except for low-budget asphalt re-roofs."}]]}],["$","li","1",{"className":"flex gap-3 text-base leading-relaxed","children":[["$","span",null,{"className":"mt-2 inline-block h-1.5 w-1.5 flex-none rounded-full bg-brand"}],["$","span",null,{"children":"Synthetic underlayment: woven polyolefin, lightweight, UV-stable for weeks of exposure, doesn't wrinkle. The right baseline for most metal installs."}]]}],["$","li","2",{"className":"flex gap-3 text-base leading-relaxed","children":[["$","span",null,{"className":"mt-2 inline-block h-1.5 w-1.5 flex-none rounded-full bg-brand"}],["$","span",null,{"children":"Self-adhered (peel-and-stick): rubberized asphalt or butyl, sticks directly to the deck, seals around fasteners. Use at eaves, valleys, penetrations, and anywhere ice-damming is a risk."}]]}]]}],["$","p","5",{"className":"text-base leading-relaxed","children":"On a metal roof in Alberta, the right spec is high-temp peel-and-stick at eaves and valleys plus heat-reflective synthetic across the field. That gets you ice-dam protection where it matters and a thermal break across the whole assembly."}],["$","h2","6",{"className":"mt-10 text-2xl font-bold leading-tight tracking-tight text-ink sm:text-3xl","children":"Ventilation: why your attic needs to breathe"}],["$","p","7",{"className":"text-base leading-relaxed","children":"An attic without proper ventilation is a moisture accumulator. Warm humid air from inside the house rises into the attic, hits the cold underside of the roof deck, and condenses into water that soaks insulation and rots framing. Most leaks that homeowners blame on the roof are actually condensation problems caused by inadequate ventilation."}],["$","h3","8",{"className":"mt-8 text-xl font-semibold tracking-tight text-ink","children":"How proper ventilation works"}],["$","p","9",{"className":"text-base leading-relaxed","children":"A balanced attic vent system uses intake vents at the soffit (low) and exhaust vents at the ridge (high). Cold dry air enters through the soffits, warms slightly, picks up moisture from the attic, and exits through the ridge — pulling moisture out before it can condense. The ratio is typically 1 sq ft of net free area per 300 sq ft of attic, split 50/50 between intake and exhaust."}],["$","h2","10",{"className":"mt-10 text-2xl font-bold leading-tight tracking-tight text-ink sm:text-3xl","children":"Common mistakes"}],["$","ul","11",{"className":"space-y-2 pl-1","children":[["$","li","0",{"className":"flex gap-3 text-base leading-relaxed","children":[["$","span",null,{"className":"mt-2 inline-block h-1.5 w-1.5 flex-none rounded-full bg-brand"}],["$","span",null,{"children":"Soffit vents that have been blanketed-over by attic insulation. The intake side is blocked and the system stops working."}]]}],["$","li","1",{"className":"flex gap-3 text-base leading-relaxed","children":[["$","span",null,{"className":"mt-2 inline-block h-1.5 w-1.5 flex-none rounded-full bg-brand"}],["$","span",null,{"children":"Mixing vent types — adding gable vents to a ridge-and-soffit system disrupts the airflow pattern and reduces overall flow."}]]}],["$","li","2",{"className":"flex gap-3 text-base leading-relaxed","children":[["$","span",null,{"className":"mt-2 inline-block h-1.5 w-1.5 flex-none rounded-full bg-brand"}],["$","span",null,{"children":"Bathroom and dryer vents discharging into the attic instead of through a roof cap. This dumps warm humid air directly into the space you're trying to keep dry."}]]}]]}],["$","h2","12",{"className":"mt-10 text-2xl font-bold leading-tight tracking-tight text-ink sm:text-3xl","children":"What to ask your roofer"}],["$","p","13",{"className":"text-base leading-relaxed","children":"Before you sign a quote, ask: 'What's the underlayment spec?' and 'What's the ventilation calculation for my attic?' If the roofer can't answer specifically — gives you a brand or a part number for one and a math result for the other — you're talking to the wrong contractor. The roof lasts as long as those two systems hold up. 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