Epoxy-coated rebar comes in the same sizes as uncoated (black) bar and is estimated at the same nominal weights. In Canada that means CSA G30.18 sizes from 10M (0.785 kg/m) to 55M (19.625 kg/m); in the US it means #3 (0.376 lb/ft) to #18. The fusion-bonded epoxy film is a fraction of a millimetre thick and adds only a small amount of mass, so bar lists, tonnage and shipping weights are worked out from the steel bar's nominal mass. What does change with coating is bending, hooks, laps and handling.
Below are the weight charts for metric and imperial coated bar, how the two systems line up, what the grade means for coated bar, and what to put on an order.
Epoxy-coated rebar weight chart (Canadian metric sizes)
The bar under the coating is ordinary reinforcing steel. The RSIC Manual of Standard Practice states that bars to be coated must meet CSA G30.18, so the nominal values are the G30.18 values:
| Bar size | Nominal diameter | Area | Mass (kg/m) | Weight (lb/ft) | Weight of a 12 m bar |
|---|---|---|---|---|---|
| 10M | 11.3 mm | 100 mm² | 0.785 | 0.527 | about 9.4 kg |
| 15M | 16.0 mm | 200 mm² | 1.570 | 1.055 | about 18.8 kg |
| 20M | 19.5 mm | 300 mm² | 2.355 | 1.582 | about 28.3 kg |
| 25M | 25.2 mm | 500 mm² | 3.925 | 2.637 | about 47.1 kg |
| 30M | 29.9 mm | 700 mm² | 5.495 | 3.692 | about 65.9 kg |
| 35M | 35.7 mm | 1000 mm² | 7.850 | 5.275 | about 94.2 kg |
| 45M | 43.7 mm | 1500 mm² | 11.775 | 7.912 | about 141.3 kg |
| 55M | 56.4 mm | 2500 mm² | 19.625 | 13.187 | about 235.5 kg |
Typical places for coated bar are bridge deck and barrier wall mats, parking structure slabs, and dowels at joints. For per-metre weights at other lengths, or mat weights per square metre, use our rebar weight chart for Canada; the numbers carry straight over to coated bar.
Why the coating is left out of the weight
The coating standards (ASTM A775/A775M for bar coated straight, ASTM A934/A934M for bar coated after bending) set a film thickness in the range of a few hundred micrometres. Next to a steel bar 11 mm to 56 mm across, that is a thin skin, and epoxy is far lighter than steel. So the industry convention is simple: bar lists and tonnage use the nominal steel mass for the bar size, the same as black bar. If a supplier quotes coated bar by weight, ask how the coating is accounted for so you are comparing like with like.
Epoxy-coated rebar sizes and weights in US bar numbers
Searches for "epoxy coated rebar #4" or "weight per foot" usually involve US bar sizes, either on a US job or in American product data. US bars are made to ASTM standards and named for their diameter in eighths of an inch:
| US bar | Diameter | Area | Weight (lb/ft) | Weight (kg/m) | Nearest Canadian bar |
|---|---|---|---|---|---|
| #3 | 3/8 in (9.5 mm) | 71 mm² (0.11 in²) | 0.376 | 0.560 | None close; 10M is 100 mm² |
| #4 | 1/2 in (12.7 mm) | 129 mm² (0.20 in²) | 0.668 | 0.994 | None; falls between 10M and 15M |
| #5 | 5/8 in (15.9 mm) | 200 mm² (0.31 in²) | 1.043 | 1.552 | 15M |
| #6 | 3/4 in (19.1 mm) | 284 mm² (0.44 in²) | 1.502 | 2.235 | 20M |
| #7 | 7/8 in (22.2 mm) | 387 mm² (0.60 in²) | 2.044 | 3.042 | None; falls between 20M and 25M |
| #8 | 1 in (25.4 mm) | 510 mm² (0.79 in²) | 2.670 | 3.973 | 25M |
A common shortcut is to treat #4 as "about 10M" and #5 as "about 15M". The second is close; the first is not. A #4 bar has 29% more area than a 10M, and a 15M has 55% more than a #4. Mixing them on a bar list changes the steel in the structure, so any conversion between the systems is an engineer's call. Our Canadian vs US rebar sizes post has the full conversion tables, including the soft-metric US labels (#10, #13, #16 and so on) that look Canadian but are not.
Epoxy-coated rebar grade
The coating does not have a structural grade; the grade belongs to the steel underneath.
- Canadian jobs: CSA G30.18 bar, usually Grade 400W. Some designs call for 500W, and the grade must be on the drawings and the bar list.
- US jobs: commonly ASTM A615 Grade 60 (420 MPa) or A706 weldable bar, as the design requires.
The grade marks rolled onto the bar are still under the coating, so they can be hard to read once the bar is coated. Tags and mill certificates matter more for coated bar than for black bar. The coating has its own certification, separate from the steel's mill certificate.
"10 mm epoxy-coated deformed rebar" is not 10M
Product listings from overseas suppliers often describe "10 mm deformed bar" or "D10" coated bar. Those bars follow other national standards, where the size is the nominal diameter in millimetres. A 10 mm bar has an area of about 79 mm². A Canadian 10M bar is 11.3 mm with 100 mm², so it carries about 27% more steel. The same goes for 12 mm, 16 mm and 20 mm bars: close in name to Canadian sizes, but not the same areas, and not made to CSA G30.18. On a Canadian project, coated bar should be G30.18 steel coated to the specification on the drawings. Our guide to international rebar sizes compares the systems.
What else changes with coated bar
Weight and size stay the same, but coated bar is detailed differently. If you are taking off a coated job from black-bar habits, these are the items that catch people:
- Larger bend diameters and longer hooks. The outside of a bend stretches the film, so coated bar is bent around bigger pins. RSIC gives separate hook tables for epoxy bar: a 15M 90° hook needs about 270 mm of bar instead of 250 mm. See bending and cutting epoxy-coated rebar.
- Longer laps and development lengths. Epoxy reduces bond, so CSA A23.3 applies a coating factor of 1.5 or 1.2, depending on cover and bar spacing. That adds real length, and real tonnage, on a mat full of laps. Our epoxy-coated rebar lap length post works through it.
- Marking on drawings. RSIC practice marks specialty bar with a prefix: epoxy-coated bar as "C" (for example C15M@300), galvanized as "G", stainless as "S" and FRP as "F". Coated bar should be clearly separated on the bar list.
- Coated accessories. Ties, chairs and supports for epoxy-coated bar should be non-metallic or coated, according to the RSIC manual.
- Repairs. Cut ends and damage are patched with an approved compound, and RSIC limits repaired area to less than 2% of the bar's surface per metre.
Ordering coated bar or an alternative
When you order epoxy-coated rebar, the order should give the bar size and grade to CSA G30.18, the coating standard (A775 or A934, or the owner's specification such as OPSS on provincial work), the bar list with coated-bar hook and lap allowances, and coated accessories.
Procut does not supply epoxy-coated bar. We detail, cut and bend black rebar from 10M to 55M and supply GFRP rebar, which some engineers consider where corrosion is the concern. If your project uses either, send us your drawings for a quote, or see our rebar products.
Frequently asked questions
How much does epoxy-coated rebar weigh?
For estimating, the same as uncoated bar of the same size: 0.785 kg/m for 10M, 1.570 kg/m for 15M and 2.355 kg/m for 20M under CSA G30.18. The epoxy film adds only a small amount of mass, and bar lists are calculated on the nominal steel mass.
What is the weight of #4 epoxy-coated rebar per foot?
A US #4 bar (1/2 inch, 12.7 mm) has a nominal weight of 0.668 lb/ft (0.994 kg/m), coated or not. There is no Canadian bar the same size: #4 falls between 10M and 15M.
What grade is epoxy-coated rebar?
The grade belongs to the steel under the coating. On Canadian jobs that is CSA G30.18 bar, usually Grade 400W; on US jobs it is commonly ASTM A615 Grade 60. The coating does not change the grade.
Is 10 mm epoxy-coated rebar the same as 10M?
No. A 10 mm bar, sold in many overseas markets, has an area of about 79 mm². Canadian 10M is 11.3 mm with 100 mm², about 27% more steel.
Does epoxy coating make rebar thicker?
Slightly. The film is a fraction of a millimetre thick, so a caliper reads a little more on coated bar. Detailing, cover and spacing still use the nominal bar size.
