Your roof is the single most critical system protecting your entire home. Learn to inspect it twice a year, spot warning signs early, and handle minor repairs yourself.
⚠️ Safety: Only go on a roof with proper footwear, a safety harness, and dry conditions. When in doubt, use binoculars from the ground or hire a roofer for an inspection.
🚨 Active Leak?A proper roof inspection twice a year — once in spring (after winter) and once in fall (before winter) — catches 90% of problems before they become expensive. Many inspections can be done from the ground with binoculars.
Do a complete ground-level inspection before ever climbing a ladder. Binoculars work well. Look from multiple angles. Most visual damage is visible from the ground — save roof climbing only for confirmed issues needing close inspection.
Use binoculars. Look for: missing or broken shingles, areas where shingles are lifting or curling, discoloration or dark patches, moss or algae growth, sagging areas or uneven roof lines.
Asphalt shingles shed granules over time — it's normal. But a sudden increase means the shingles are reaching end of life. Check the downspout splash area after rain for heavy granule accumulation.
Flashing is the metal strips around chimneys, skylights, vents, and where the roof meets walls. These are the #1 source of leaks. Look for rust, gaps, or lifting edges.
Go into the attic on a sunny day. Look for daylight showing through the roof, water stains on rafters or insulation (brownish rings), soft or spongy spots on the sheathing. Also check ventilation is adequate — improper ventilation shortens roof life by years.
1–5 missing shingles after a storm is a straightforward repair. More than that, or if finding matching shingles is difficult, consider a professional.
Use a roof harness, work on a dry day, wear rubber-soled shoes. Tell someone you're going on the roof. Never work alone. Do not work on roofs with pitch steeper than 6/12 without professional equipment.
Bring a sample of your existing shingle to the hardware store. Match the color, style, and weight (3-tab vs architectural). Shingles weather and fade — a perfect match from 10 years ago may still look slightly different.
Use a flat pry bar to lift the shingle tabs above the damaged one. Remove the roofing nails holding the damaged shingle (4 nails typical). Slide out the old shingle carefully.
Slide the new shingle into place, aligned with the others in the row. The top edge should sit under the shingle course above it. Nail in place with 4 roofing nails — place them just below the upper shingle's exposure point.
Apply a small amount of roofing cement under the corners of the replaced shingle and under the tabs above it to re-bond them. Press down firmly. The cement seals out water immediately.
Moss holds moisture against shingles and causes premature aging. Black algae streaks are aesthetic only but indicate moisture problems. Both are treatable from the ground.
High-pressure water blasts off the granules that protect asphalt shingles. Use low-pressure soft washing or a garden sprayer only. This cannot be undone.
Mix 1 part household bleach + 1 part water (or use commercial roof moss killer). Using a garden sprayer from a ladder, apply to affected areas generously. Protect plants and grass below with tarps — the runoff is harmful.
Rinse from top to bottom with a garden hose on low pressure. The moss will turn brown and die over 1–2 weeks. Dead moss will wash off with rain or can be brushed gently with a soft push broom from the ground.
Install zinc or copper strips (6" wide) along the ridge cap. When it rains, zinc oxide washes down the roof — moss and algae cannot grow in the presence of zinc. Long-term prevention built into the roof.
Flashing failure — not shingle failure — is the leading cause of roof leaks. Metal flashing around chimneys, skylights, and vents can be re-sealed without replacing the entire flashing system.
If the stain on your ceiling appears close to a chimney, skylight, or vent — that's almost certainly flashing. If it appears in the middle of a roof field — that's more likely a missing or cracked shingle. Fix the right thing first.
Look for: gaps where caulk has pulled away, lifted edges that water can get under, rust stains (steel flashing rusting), missing pieces, or places where step flashing has slid down. Most residential flashing is either step flashing (at walls) or counter flashing (at chimneys).
Scrape off old, cracked roofing cement with a putty knife. Clean the metal with a wire brush. Apply new roofing cement (also called roofing tar or plastic cement) generously under lifted edges. Press the flashing down firmly and apply another layer on top, feathering the edges. Roofing cement is not beautiful, but it's very effective when fresh.
Step flashing (L-shaped pieces at wall joints) sometimes slides down over the years. Re-seat each piece in the shingle course above it and add a roofing nail through the flashing into the sheathing below. Seal over the nail head with roofing cement.
If the metal has visible rust-through holes, has buckled significantly, or if the same area keeps leaking after re-sealing — full flashing replacement is needed. Chimney re-flashing is a job for a roofer or an experienced DIYer, as it requires removing courses of brick mortar (counter flashing) to do it properly.
Ice dams form when heat escaping through a warm roof melts snow that then refreezes at the cold eaves. The resulting backup forces water under shingles into your home. Prevention is 99% easier than cure.
This damages shingles and flashings directly, often creating new leak paths. Use calcium chloride only — or better yet, a roof rake to remove snow from the edge before dams form.
A roof rake (a long-handled aluminum squeegee) pulls snow off the lower 3–4 feet of your roof from the ground. Removing the snow removes the fuel that creates ice dams. Do this after every significant snowfall in ice-dam-prone conditions (heavy snow, temp cycling above/below freezing).
If a dam forms, fill old pantyhose with calcium chloride ice melt (NOT rock salt — rock salt damages shingles and is corrosive to metals). Lay the calcium-filled hose perpendicular to the dam, extending over the eave. The calcium melts a channel through the ice for water to drain. Takes 24–48 hours.
Ice dams are caused by heat escaping through the roof deck. The permanent fix is: add attic insulation (R-38 to R-60 in cold climates) so heat stays in the living space, and ensure proper attic ventilation so the roof deck stays cold evenly. This adds-energy efficiency and permanently eliminates ice dam conditions.
Plug-in heat cables zigzagged along problem eaves are a backup solution for areas where attic improvement isn't feasible. They won't fix the root cause (heat loss) but prevent ice from accumulating. Use self-regulating cable — it uses less electricity and won't overheat.
A new roof is the largest single exterior repair most homeowners face. The decision to repair vs. replace is financial and technical — here's how to make it objectively.
If your roof is over 20 years old AND repairs would cost more than 50% of a new roof — replace it. Patching an old, near-end-of-life roof is throwing money away. Conversely, a 10-year-old roof with isolated damage is almost always worth repairing.
3-tab asphalt: 15–20 year lifespan. Architectural/dimensional shingles: 25–30 years. Metal roofing: 40–70 years. Wood shingles: 20–25 years. Slate: 75–100+ years. If you don't know the age, check permit records with your local building department.
Multiple areas of missing shingles (not isolated storm damage). Widespread granule loss (gutters full of granules consistently). Sagging or waves in the roof deck. Shingles curling on more than 30% of the surface. More than $3,000 in recent repair costs in the past 2 years. Any active structural decay in the decking or rafters.
Never take the first quote. Each roofer should physically walk the roof, show you their measurements, specify the exact shingle product, number of layers being removed, and whether decking will be replaced. Written warranties should cover both materials (manufacturer) and labor (contractor). Compare these factors, not just the price.
A re-roof is the best time for: ice and water shield under the entire roof (not just 3 feet at the eave), better ventilation (ridge vent + soffit vents), upgraded architectural shingles vs 3-tab, and improved flashing details. These relatively small cost additions at replacement time add years to the new roof's life.