Rubber Roof Cost Calculator

A rubber (EPDM) roof typically costs $4 to $9 per square foot installed, so a 1,000 sq ft flat roof usually runs about $4,500 to $9,000, an RV roof (~250 sq ft) about $1,200 to $2,500, and a shed roof a few hundred dollars to around $1,000. The price is driven by the structure type (a simple shed is cheapest; an RV roof costs the most per square foot because of the detail work around vents and the AC unit), the EPDM membrane thickness (45, 60, or 90 mil), the attachment method (ballasted, mechanically fastened, or fully adhered), whether an old roof must be torn off first, and extras like rigid insulation and a reflective coating. A ~$800 job minimum applies. Rubber is one of the most affordable and reliable choices for flat and low-slope roofs — enter your roof above for a localized estimate.

A rubber roof most often means EPDM (ethylene propylene diene monomer), a durable synthetic-rubber membrane made for flat and low-slope roofs. It comes in large rolls or sheets that are laid over the roof deck — usually over rigid insulation — and sealed at the seams to form one continuous waterproof barrier. EPDM is popular because it's inexpensive, long-lasting (commonly 20–30+ years), flexible across a wide temperature range, resistant to UV and weathering, and very easy and cheap to repair. You'll find it on residential flat roofs, additions, porches, garages, sheds, mobile/manufactured homes, and RV roofs. It's usually black, though white versions exist for better heat reflection. 'Rubber roof' can loosely include TPO and PVC membranes too, but EPDM is the classic rubber roofing this calculator focuses on.

A quality EPDM rubber roof typically lasts 20 to 30 years or more when properly installed and maintained — one of its biggest selling points. The membrane resists UV, ozone, weathering, and temperature extremes, and it stays flexible instead of turning brittle, so it holds up over decades. Thicker membranes (60 or 90 mil) last longer and resist punctures better than thin 45 mil. Longevity depends heavily on installation quality — properly sealed seams and flashings are what keep it watertight — and on maintenance like keeping the roof clean, clearing debris, and promptly patching any punctures. Because EPDM is easy and inexpensive to repair, a rubber roof can usually be kept watertight for its full lifespan with minor upkeep, and a reflective coating can extend it further.

EPDM comes in three common thicknesses, measured in mils (thousandths of an inch). 45 mil is the thinnest and most economical — fine for budget projects, sheds, and simple roofs with light foot traffic. 60 mil is the most popular residential and light-commercial choice, with a good balance of durability, puncture resistance, and lifespan; it's the recommended baseline for most homes and the default here. 90 mil is the heaviest-duty option, best where the roof will see foot traffic, hail, or harsh conditions, or where maximum lifespan is the goal — it adds about 20% in this calculator. In short: 60 mil is the sweet spot for most residential flat roofs, 45 mil saves money on low-stakes structures, and 90 mil is worth it for demanding conditions. The calculator lets you compare all three.

These are the three ways the EPDM membrane is held to the roof. Ballasted (loose-laid) sets the membrane down loose and weighs it down with a layer of stone ballast or pavers — quickest and cheapest to install, but it adds weight (the structure must support it) and isn't suited to sloped roofs. Mechanically fastened uses screws and plates along the seams to secure the membrane to the deck — a common, cost-effective baseline. Fully adhered glues the membrane down across its whole surface with adhesive — the cleanest look, the best wind-uplift resistance, and it works on any slope, but it takes the most labor and costs about 10% more here. The right method depends on the roof's slope, local wind requirements, the structure's load capacity, and budget. Fully adhered is popular on residential roofs where appearance and wind resistance matter most.

Yes — EPDM rubber is one of the most common roofing materials for RVs, campers, and mobile/manufactured homes, and re-roofing them with rubber membrane is a frequent project. Many RVs leave the factory with EPDM or TPO rubber roofs, and when the original ages, cracks, or leaks, it's replaced with new membrane. The work involves removing the old roofing, prepping and repairing the deck, and adhering new membrane, with careful detailing and resealing around every penetration — vents, the AC unit, skylights, and antennas — which is exactly where leaks start. RV roofs cost a bit more per square foot than a plain flat roof because of all that detail work packed into a small area. Mobile home roofs are also commonly redone with rubber membrane or rubber coatings. This calculator includes RV and mobile-home structure types and a vent/AC-resealing add-on.

Rubber (EPDM) is one of several flat-roof membranes, each with trade-offs. EPDM's strengths are low cost, a long lifespan, proven durability, flexibility in cold weather, and very easy, cheap repairs — a reliable, budget-friendly workhorse, especially in black for cold climates. TPO is a thermoplastic membrane, usually white, that reflects heat and can lower cooling costs, with heat-welded seams that are very strong; it's the go-to for energy efficiency in hot climates. PVC is the most durable and chemical-resistant (good near restaurant or industrial exhaust) but the most expensive. Modified bitumen and built-up tar-and-gravel are older asphalt-based systems. For a homeowner wanting an affordable, long-lasting, easy-to-maintain flat roof, EPDM is an excellent pick; if a white, reflective, energy-saving surface is the priority, TPO may edge it out. The best choice depends on climate, budget, and how the roof is used.

For a typical residential flat roof, installing an EPDM rubber roof usually takes 1 to 3 days, depending on the size, the attachment method, and whether an old roof must be torn off first. The process is: remove any old roofing, inspect and prep (and repair) the deck, install rigid insulation board if included, then roll out, position, and adhere or fasten the membrane, and carefully seal all seams, edges, and the flashings around penetrations. Small projects like a shed or RV roof can often be done in a day, while larger or more detailed roofs take longer. Good seam and flashing work is what makes a rubber roof watertight, so that detailing is worth the time. Dry weather is needed for adhesives to bond, so installers watch the forecast — and once it's on, the roof performs right away.