Flat Roof Replacement in Ampere from $5. EPDM, TPO or modified bitumen, priced per square foot, with the drainage looked at before the membrane. Free inspection and a written quote.
Converted buildings collect flat roofs. Every time a property was extended or subdivided somebody added a rear section, and those sections join the original roof at junctions built by different trades decades apart. The junction is where the water gets in, not the membrane.
Flat roofing in New Jersey installs at $5 to $14 per square foot by system: EPDM $5 to $9, TPO $6 to $12, tear-off and insulation included. On a 1,500 square foot section that is $7,500 to $13,500 in EPDM against $9,000 to $18,000 in TPO.



New Jersey flat roofing installs at $5 to $14 per square foot by system -- EPDM $5 to $9, TPO $6 to $12, tear-off and insulation included. On a 1,500 square foot section that is $7,500 to $13,500 in EPDM against $9,000 to $18,000 in TPO. Two things push an Ampere quote around. Whether the building is actually three units now rather than two, which changes the paperwork; and how many penetrations a conversion added, because each one is a detail to be flashed properly rather than sealed.
Standing water 48 hours after rain means the fall is wrong or the outlet is blocked. In a freezing winter that water expands inside a lap and lifts it, then thaws and runs in through the gap it made. Re-covering over it buys a couple of seasons.
Parapets, copings and internal outlets, each of which has to be formed and flashed. Insulation, which is a real part of the cost and should be stated. And occupied units underneath, which decide the sequence.
EPDM is the least expensive and on a small rear addition it is frequently correct. TPO earns its premium on larger areas. We will say which applies rather than defaulting to the pricier one.
Ampere is where the two- to three-unit conversion question comes up most. A duplex converted to three flats at some point in the last century is now a multiple dwelling whether or not anybody filed anything, and that is worth establishing before a roof job rather than during one.
One is about your building and one is about your covering, and most quotes in this city establish neither.
At one or two and detached, replacing a covering is ordinary maintenance under N.J.A.C. 5:23-2.7: no permit, no inspection. At three it is permitted construction work, and the building is also a registered multiple dwelling under N.J.S.A. 55:13A-1 et seq. on a five-year inspection cycle. Nothing about the roof explains that.
On asphalt, if the covering away from the leak still lies flat, holds its granules and is not brittle, the roof has life in it and a repair is the right job. A failed flashing or a split upstand is hundreds of dollars and is routinely produced as proof that the whole roof is finished.
Two coverings is the practical ceiling. A roof already at two is a tear-off whatever anybody quotes, and it takes two minutes to check at the rake edge. It is the fastest way to tell whether the quotes in front of you describe the same job.
The recurring Ampere question is how many units the building actually has now.
The classic Ampere three-family is a converted duplex, and conversions leave traces on a roof.
Conversions add penetrations, and penetrations are where shingle roofs leak.
Where a slate house was subdivided, the additions almost never got slate: they got asphalt or a flat roof, and the junction between the two is where a slate roof in this neighborhood typically leaks.
Converted buildings usually have a rear addition whose roof is on a different clock from the main one.
The three-unit line runs right through this city.
The largest houses, and where slate survives.
Genuinely mixed eras. A neighbor proves nothing.
Tight frontages, tenants, and nowhere to park a dumpster.
Flat roofs behind parapets. Access comes first.
Same buildings, a different construction office.
Three-plus units is the default, not the exception.
The questions that come up, before you have to ask.
More urgent than in a warm climate. Water still sitting 48 hours after rain means the fall is wrong or the outlet is blocked, and in a freezing winter that water expands inside laps and under flashings and lifts them mechanically.
EPDM at $5 to $9 per square foot is the cheaper system and on a small rear addition it is frequently right. TPO at $6 to $12 earns its premium on larger areas. We will tell you which applies rather than defaulting to the pricier one.
Usually not. Slate outlives almost everything fixed to it, and slipped slates on a pre-war roof normally mean the nails have corroded rather than that the slate has failed. Leaks at a valley usually mean a rusted lining. Both are repairs, and replacing an existing slate roof at $20 to $35 per square foot is a very expensive way to fix a nail problem.
Because most online figures are national and this is not a national market. New Jersey pricing is $9,500 to $26,000 for an architectural asphalt roof, and a good part of the difference is detailing a warm climate does not need: ice barrier at the eaves, drip edge, and the nailing to survive a February gust.
Across separate structures, yes, and it is often the right answer -- a garage, a rear addition and the house are three roofs of three different ages. Across one roof, usually not: mobilization and waste cost much the same twice as once, you get a visible line where new meets weathered, and the half left behind ages through another winter.
Unit count established before anything is priced. New Jersey figures, not a national calculator.