The curl starts at the rake edge, where wind gets under the tabs first. Twelve years back somebody nailed a second course of shingles straight over the original roof on a modest single-story ranch, took the cheapest of three bids, and called it a savings. Now those edges lift, granules have washed down into the gutter, and two companies have already said the same sentence back. No warranty on a layover. Here is the argument in one line: a full tear-off costs more on the invoice and less over the life of the roof, and that is the version priced by the roofing contractors linwood nj homeowners hire when they want a manufacturer warranty registered on the finished job. Pay for the deck now, or pay for it twice.
A Second Shingle Layer Hides The Real Problem
A layover is what it sounds like. New shingles go over the old ones, with no removal, no dumpster, and no look at what is holding the whole assembly up. Job after job, what turns up once the old roofing finally comes off is soft decking at the eaves, where years of ice and blown rain worked into the plywood, plus old nail holes nobody could see through two layers of asphalt. The second layer also parks weight on a deck that was never sized for it, and every new fastener has to reach through twice the material to bite framing. Those tabs were on borrowed time from the day they went on.
Cheap Bids Skip The Line Items That Matter
A bid comes in low for a reason, and the reason is a line that is not printed on it. Set two estimates side by side and the gaps show up quickly: tear-off and disposal, new drip edge, ice and water membrane at the eaves, an allowance for replacing bad plywood, a ridge vent, the town permit, and a crew that arrives tied off. Fall protection is not free. Federal rules require every personal fall arrest anchorage to hold at least 5,000 pounds for each worker attached to it, a threshold spelled out in OSHA's construction fall protection standard, which is the plainest reason a homeowner should never climb up and walk a curling or multi-layer roof to hunt for soft spots: that inspection belongs to a licensed, insured contractor working with proper fall protection. Ask the roofing contractors Linwood NJ homeowners rehire to price the tear-off as its own line, and the comparison stops being guesswork.
Running The Numbers On A 1,600 Square Foot Ranch
Roofs are priced by the square, which is trade shorthand for a 100 square foot patch of roof surface, not by the house. A February 2026 cost breakdown published by EstimationPro AI put basic asphalt shingle labor at $50 to $90 per square, with tear-off work adding $25 to $50 per square on top of that. Those are labor figures only, so materials, the permit and the dumpster still sit on the estimate underneath them. On a 1,600 square foot ranch out on the Atlantic County mainland, roof surface after pitch and waste usually lands near 20 squares.
So put numbers on it, treating every figure below as an illustrative scenario rather than a quote. Twenty squares of architectural shingle with underlayment, ice and water at the eaves, drip edge and a ridge vent, at say $310 a square in materials, is $6,200. Install labor at $75 a square adds $1,500. Tearing off two layers rather than one, call it $80 a square for the pair, is another $1,600. Six sheets of replacement plywood at roughly $75 a sheet installed puts another $450 on the estimate, and the dumpster plus the permit runs about $750. That comes to $10,500 all in, sitting at the low end of the $10,000 to $18,000 range quotes on a ranch this size tend to fall into. Skip the tear-off and the disposal and you shave maybe $2,200 off today's total (which is real money, and pretending otherwise would be silly), while giving up the only look at that deck anybody gets for the next twenty years.
Where Extended Warranty Coverage Actually Comes From
Shingle warranties are not one thing. Material coverage comes from the manufacturer, workmanship coverage comes from the contractor, and the long extended warranty most homeowners assume they are buying only exists when a certified installer registers a full system after the old roofing is gone. GAF, for one, allows its Master Elite contractors to register the Golden Pledge, a 50-year limited coverage on materials and workmanship, and that registration is off the table on a layover. How many layers a roof may carry is a local question too, since some towns write a cap into their building code, so ask your construction office instead of assuming.
One owner a couple of towns over learned all of this at resale rather than at a leak. Her buyer's home inspector counted three layers, the lender wanted the roof addressed before closing, and the credit came straight off the sale price. That was the second time the cheap roof got paid for.
Pay Once For The Roof You Actually Need
The low bid on a layover is not a cheaper roof. It is the same roof bought in two installments, and the second installment includes plywood, framing repairs nobody budgeted, and a warranty that never existed. Get the tear-off priced per square, ask what the deck allowance covers and what happens if the crew finds rot at the eaves, then confirm that whoever wins the job can actually register the coverage they are describing. Twelve years of quiet is what a doubled-up roof buys, and that is not long enough to call it the cheaper option.
