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What a Roof Replacement Actually Includes<\/h2>\n
Strip the marketing away and a roof replacement is six layers of decisions stacked on top of one another. Each layer protects the one below it, and skipping one is how most failed projects happen.<\/p>\n
The first layer is the roof deck<\/strong>, usually half-inch plywood or OSB sheathing nailed to the trusses. The contractor pulls the old shingles, then walks the deck to mark soft spots before any new material goes down.<\/p>\n Replacing bad panels costs about $50 to $75 per square foot of deck. Square is a trade term for a 10-by-10-foot area, so 20 squares is roughly a 2,000-square-foot roof. Knowing that helps you read any estimate you receive.<\/p>\n On top of the deck goes the underlayment system<\/strong>. Code in most of the United States calls for ice and water shield at the eaves, typically the first three feet, plus a synthetic underlayment across the rest of the field.<\/p>\n Synthetic underlayment has largely replaced the old 30-pound asphalt felt. It walks better under the crew, resists tearing, and lasts longer before the shingle goes on top. The few hundred saved by going with felt usually disappears in one callback.<\/p>\n Then come the flashings at every penetration and transition: drip edge<\/strong> along the eaves and rakes, valley flashing where two slopes meet, and boots around plumbing vents. The IRC section R905.2.8.5 requires drip edge on shingle roofs.<\/p>\n Finally the shingles or panels, the starter strip<\/strong>, the hip and ridge cap, and the ventilation pieces that keep the attic from cooking in summer. None of these is glamorous, and none is the place to save money.<\/p>\n There is a question that comes up on every estimate, and the answer changes the cost by thousands. Do you strip the old roof down to the deck, or do you shingle over what is there?<\/p>\n A full tear-off<\/strong> removes everything to the deck, lets the crew inspect and repair the wood, and starts fresh. An overlay<\/strong> (sometimes called a re-roof) leaves the existing layer in place and nails a new layer on top.<\/p>\n Choose full tear-off if your roof already has two layers, if you see widespread curling or granule loss, or if your decking has never been inspected. Choose an overlay only when the existing roof is flat, single-layered, and relatively young.<\/p>\n For more on the symptom side, our signs you need a new roof<\/a> guide walks through how to tell which camp you are in before you call anyone out for an estimate.<\/p>\n For material, asphalt shingles<\/strong> dominate North America because they cost the least and install fast. Architectural asphalt runs $4 to $7 per square foot installed. Metal roofing<\/strong> lasts longer, often 40 to 70 years, but you will pay $8 to $14 per square foot installed.<\/p>\n For a deeper look at how these stack up, our asphalt vs metal vs tile roofing<\/a> comparison breaks down climate, noise, and resale considerations side by side so the choice gets easier.<\/p>\n A roof fails from the edges inward. Water always wins against gravity when given a path, and a sloppy detail at the eaves shows up as a stain in the living room two winters later.<\/p>\n The crew protects the site first: tarps over shrubs, plywood against siding where the chute will drop debris. Then the tear-off happens in sections, never the whole roof at once, so a surprise thunderstorm does not soak the deck.<\/p>\n Old flashing comes off with the shingles. The crew then sweeps the deck clean, not just visible debris but the ancient grit that hides nail heads. Repairs happen next, and bad plywood gets cut out and replaced with fresh sheathing.<\/p>\n Underlayment goes on bottom-up, with the ice and water shield<\/strong> at the eaves first, then valleys, then the field. Drip edge is nailed along the eaves before the underlayment laps over it, or along the rakes after, depending on the regional detail.<\/p>\n Shingles start at the eaves with a starter strip that has a glue line at the bottom. Each course overlaps the previous one, and nails land in the nailing strip, not above it. Six nails per shingle is the high-wind standard; four is the code minimum.<\/p>\n For more on the project day itself, our roof replacement process step by step<\/a> walkthrough covers every phase from quote to final walkthrough so nothing surprises you mid-project.<\/p>\n For the permit and inspection, our roof replacement permit and code requirements<\/a> page covers what your local office asks for during the project.<\/p>\n Most failures are not dramatic. They are the slow kind, where a shortcut during install becomes a callback in year three. Here are the four that hurt homeowners the most.<\/p>\n The first is a bad underlayment<\/strong> choice. Old 30-pound felt tears under foot traffic during install, lets wind-driven rain through, and wrinkles under sun heat. Synthetic underlayment stays flat, resists tear, and gives the crew a safer surface.<\/p>\n The second is skipping the starter strip<\/strong>. Without it, the first course of shingles has no glue line at the eaves, and wind lifts the edge in the first big storm. The third is reusing old flashing instead of replacing it with new.<\/p>\n Flashing is cheap relative to the rest of the job, and old flashing almost never seats properly against new shingles. These are the small choices that compound into the slow leaks no one can find in year five.<\/p>\n The fourth, and the most expensive, is ignoring attic ventilation<\/strong>. A roof that cannot breathe from the soffit to the ridge cooks the shingles from below, voids the warranty, and feeds ice damming on roof<\/a> problems in cold climates.<\/p>\n If you are unsure what your attic is doing today, our roof ventilation types guide<\/a> explains the difference between ridge vent, box vent, and powered fan, and when each makes sense for your roof shape.<\/p>\n You have two parallel tracks once the decision is made: the paper trail and the people trail. Run them together and the project moves quickly. Run them apart and you wait on weather windows for weeks.<\/p>\n On the paper trail, pull your insurance policy<\/strong> and check whether your roof is covered for wind or hail. Many homeowner policies use replacement cost value (RCV) instead of actual cash value (ACV), and that difference is thousands of dollars.<\/p>\n If the job is storm-driven, our storm damage roof insurance claim<\/a> guide walks through the documentation that adjusters actually look for when they visit your property.<\/p>\n Next, confirm whether your municipality requires a building permit. Most jurisdictions require one for full tear-offs under section R105 of the IRC, and the cost is usually under $500, paid at the permits counter<\/strong>. Skipping the permit<\/strong> can stop a sale later and void coverage.<\/p>\n On the people trail, get three written estimates. Ask each roofer to specify the underlayment brand, the ice and water shield coverage in feet, the nail count per shingle, and the workmanship warranty in years.<\/p>\n A manufacturer warranty of 25 to 50 years on materials means nothing if the install warranty is two years. For more on vetting the contractor, our how to choose a roofing contractor<\/a> checklist is built for this exact moment in the process.<\/p>\n Plan for a 10 to 15 percent contingency on top of the contract. Decking surprises, rotten fascia, and hidden second layers all show up after tear-off.<\/p>\n For prep around the house itself, our how to prepare your house for roof replacement<\/a> guide covers what to move and what to cover during the loud days.<\/p>\n If the timing on payment does not work, look at financing early. Contractor financing, home equity, and FHA Title I loans all sit between 7 and 15 percent APR depending on credit. Our financing a new roof options<\/a> page breaks down which paths cost less over the life of the loan.<\/p>\n For the budget side specifically, our roof replacement cost<\/a> guide has the per-square-foot numbers by material and region. And if you are unsure whether you need a full replacement or a repair, our roof replacement vs repair<\/a> comparison will tell you which side of that line you are on.<\/p>\n A good roof replacement is mostly boring. The right crew shows up, runs the same careful sequence the code book describes, and leaves you with a dry house and a warranty that means something. The trick is recognizing that the boring parts are exactly the parts you cannot see once the shingles go down.<\/p>\n","protected":false},"excerpt":{"rendered":" A roof replacement is one of those projects that quietly decides itself. One storm, one slow leak, one inspector with a flashlight, and you are suddenly staring at a five-figure line item you did not plan for this year. Most homeowners feel overwhelmed at this exact moment, and the questions stack up fast. It does […]<\/p>\n","protected":false},"author":2,"featured_media":1152,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1153","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tips"],"_links":{"self":[{"href":"https:\/\/www.skala8.com\/blog\/wp-json\/wp\/v2\/posts\/1153","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.skala8.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.skala8.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.skala8.com\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.skala8.com\/blog\/wp-json\/wp\/v2\/comments?post=1153"}],"version-history":[{"count":0,"href":"https:\/\/www.skala8.com\/blog\/wp-json\/wp\/v2\/posts\/1153\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.skala8.com\/blog\/wp-json\/wp\/v2\/media\/1152"}],"wp:attachment":[{"href":"https:\/\/www.skala8.com\/blog\/wp-json\/wp\/v2\/media?parent=1153"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.skala8.com\/blog\/wp-json\/wp\/v2\/categories?post=1153"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.skala8.com\/blog\/wp-json\/wp\/v2\/tags?post=1153"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}The Two Big Decisions: Tear-Off vs Overlay, and Material<\/h2>\n
How the Job Is Built So It Lasts<\/h2>\n
Where Roof Replacements Go Wrong (and Cost You Twice)<\/h2>\n
What to Do Next: A Short Plan That Actually Works<\/h2>\n