25M Rebar: Size, Weight, Uses & Complete Guide for Canadian Construction
When it comes to reinforced concrete construction, choosing the correct reinforcing steel is essential for strength, durability, and long-term structural performance. 25M rebar is one of the commonly used reinforcing bar sizes in Canada and is frequently specified for foundations, walls, slabs, columns, and other concrete structures.
But what exactly is 25M rebar? What is its diameter and weight? Where is it used, and why is it an important choice for concrete construction?
In this guide, we explain everything you need to know about 25M rebar, including its dimensions, weight, applications, Canadian standards, and the importance of professional rebar installation.
What Is 25M Rebar?
25M rebar is a Canadian metric designation for a deformed reinforcing steel bar used to reinforce concrete.
The 25M designation does not mean that the bar is exactly 25 mm in diameter. Under the Canadian reinforcing bar system, the designation is associated with the bar’s nominal cross-sectional area.
A standard 25M reinforcing bar has a nominal cross-sectional area of approximately 500 mm² and a nominal diameter of approximately 25.2 mm. Its nominal mass is about 3.925 kg per metre.
These characteristics make 25M rebar a substantial reinforcing bar suitable for a wide range of structural concrete applications.
25M Rebar Size and Weight
Understanding the physical properties of 25M rebar is important when estimating material quantities, transportation requirements, reinforcement schedules, and project costs.
| Property | 25M Rebar |
| Canadian designation | 25M |
| Nominal diameter | 25.2 mm |
| Cross-sectional area | 500 mm² |
| Weight | Approximately 3.925 kg/m |
| Weight per foot | Approximately 2.64 lb/ft |
| Canadian standard | CSA G30.18 |
The published Canadian rebar tables identify 25M as having a nominal diameter of 25.2 mm, an area of 500 mm², and a mass of approximately 3.925 kg/m.
How Much Does 25M Rebar Weigh?
A 25M rebar weighs approximately 3.925 kg per metre.
For example:
- 1 metre ≈ 3.925 kg
- 5 metres ≈ 19.63 kg
- 10 metres ≈ 39.25 kg
- 12 metres ≈ 47.10 kg
Actual ordering, cutting, lap lengths, bends, and project requirements should always be based on the approved reinforcement drawings and project specifications.
What Is 25M Rebar Used For?
25M rebar can be used in many reinforced concrete applications where the structural design calls for a larger reinforcing bar.
Common applications include:
1. Concrete Foundations
25M reinforcing bars can be incorporated into reinforced concrete foundations to provide tensile reinforcement and help concrete structures resist structural loads.
2. Concrete Walls
Reinforcing steel is commonly placed within structural concrete walls according to engineered reinforcement drawings. 25M bars may be specified where the required reinforcement area calls for this bar size.
3. Structural Slabs
Large commercial, industrial, and infrastructure projects may use 25M reinforcement in slabs where additional reinforcement capacity is required.
4. Columns and Beams
Depending on the structural design, 25M bars can form part of the longitudinal or reinforcing system in concrete beams and columns.
5. Industrial and Civil Infrastructure
Heavy-duty concrete structures—including infrastructure and industrial facilities—can require substantial reinforcement. 25M rebar is one of the standard Canadian bar sizes available for these applications.
The appropriate rebar size, spacing, grade, lap length, development length, and placement must always follow the structural engineer’s drawings and applicable project requirements.
25M Rebar and CSA G30.18
Canadian reinforcing steel is commonly specified according to CSA G30.18, the Canadian standard for carbon steel bars for concrete reinforcement.
Canadian government documentation identifies CSA G30.18 as the applicable national standard for reinforcing bars and lists 25M among the commonly used Canadian bar designations.
Different grades of reinforcing steel can be available under the Canadian standard. For example, Grade 400 reinforcing steel has a specified minimum yield strength of 400 MPa.
The required grade should be determined from the project’s structural specifications rather than selected solely based on bar size.
25M Rebar vs. Other Canadian Rebar Sizes
25M is only one of several Canadian metric reinforcing bar sizes.
| Rebar Size | Nominal Area | Approx. Diameter | Approx. Weight |
| 10M | 100 mm² | 11.3 mm | 0.785 kg/m |
| 15M | 200 mm² | 16.0 mm | 1.570 kg/m |
| 20M | 300 mm² | 19.5 mm | 2.355 kg/m |
| 25M | 500 mm² | 25.2 mm | 3.925 kg/m |
| 30M | 700 mm² | 29.9 mm | 5.495 kg/m |
| 35M | 1,000 mm² | 35.7 mm | 7.850 kg/m |
These values are published in Canadian reinforcing-bar reference tables.
The correct bar size depends on the structural design. A larger bar is not automatically better for every application because reinforcement design also considers spacing, concrete dimensions, cover, development, detailing, constructability, and other engineering requirements.
Why Proper 25M Rebar Installation Matters
Supplying the correct rebar is only one part of reinforced concrete construction. Accurate placement and installation are equally important.
Rebar must be installed according to the approved drawings and project specifications. Incorrect spacing, positioning, laps, supports, or concrete cover can affect the intended reinforcement system.
Professional installation helps ensure that reinforcing steel is:
- Positioned according to the reinforcement drawings
- Properly tied and supported
- Installed with appropriate concrete cover
- Coordinated with other structural components
- Ready for inspection before concrete placement
- Installed efficiently within the project schedule
This is where an experienced rebar contractor can make a significant difference to a construction project.
25M Rebar Installation in British Columbia
For construction projects in Surrey and throughout British Columbia, working with an experienced reinforcing contractor can help keep reinforcement work organized, accurate, and aligned with the construction schedule.
21 Rebar Ltd. provides rebar installation services for residential, commercial, industrial, and civil construction projects in British Columbia. The company supports contractors and developers with reinforcement installation, project planning, safety-focused execution, and quality checks.
Their services include rebar installation for:
- Foundations
- Concrete walls
- Structural slabs
- Residential construction
- Multi-family developments
- Commercial buildings
- Industrial facilities
- Infrastructure and civil projects
The company describes its process around project review, planning, installation, and quality checks, helping coordinate reinforcement work with project requirements and schedules.
How to Choose the Right Rebar for Your Project
Choosing reinforcing steel should begin with the structural drawings and project specifications.
Before ordering or installing 25M rebar, project teams should confirm:
- Bar size – Is 25M specified on the structural drawings?
- Grade – What reinforcing steel grade is required?
- Quantity – How many bars and what lengths are required?
- Spacing – What spacing is specified by the engineer?
- Bends and shapes – Are bars required to be bent or fabricated?
- Lap and development requirements – What does the structural design specify?
- Concrete cover – What cover is required for the application?
- Schedule – When must the reinforcement be delivered and installed?
- Site conditions – Are there access, lifting, or sequencing requirements?
These details should be confirmed before fabrication and installation.
Why Work With a Professional Rebar Contractor?
Reinforcing steel installation is a specialized part of concrete construction. An experienced contractor understands the importance of accurate placement, project coordination, safety, and schedule management.
At 21 Rebar Ltd., the focus is on practical reinforcement support, safe site execution, quality workmanship, and dependable project delivery. The company serves Surrey and projects throughout British Columbia.
Whether your project involves a residential foundation, multi-family development, commercial structure, industrial facility, or civil infrastructure, professional rebar installation can help keep the reinforcement phase organized and ready for the next stage of construction.
Frequently Asked Questions About 25M Rebar
Is 25M rebar 25 mm?
Not exactly. A standard 25M reinforcing bar has a nominal diameter of approximately 25.2 mm. The 25M designation is part of Canada’s metric reinforcing-bar system and should not be interpreted as an exact 25 mm diameter.
How much does 25M rebar weigh per metre?
25M rebar weighs approximately 3.925 kg per metre.
What is the cross-sectional area of 25M rebar?
The nominal cross-sectional area of 25M rebar is 500 mm².
What is 25M rebar used for?
25M rebar can be specified for reinforced concrete foundations, walls, slabs, beams, columns, and industrial or civil structures, depending on the structural design.
Is 25M rebar the same as 25 mm rebar?
They are not exactly the same designation. 25M is a Canadian metric reinforcing-bar designation, and its nominal diameter is approximately 25.2 mm.
What grade is 25M rebar?
25M describes the bar size, not the steel grade. Different reinforcing steel grades can be specified, so the required grade should be confirmed from the project’s structural drawings and specifications.
Where can I get 25M rebar installation in BC?
21 Rebar Ltd. provides reinforcing steel installation services in Surrey and throughout British Columbia, supporting residential, commercial, industrial, and civil construction projects.
Get Professional Rebar Installation for Your Next Project
Planning a concrete construction project in Surrey or elsewhere in British Columbia?
The right reinforcement installation partner can help you coordinate rebar placement, site requirements, safety, quality, and construction schedules.
21 Rebar Ltd. provides professional rebar installation services for residential, commercial, industrial, and civil projects across British Columbia.
Ready to discuss your project?
Contact 21 Rebar Ltd. to discuss your project scope, schedule, and reinforcement requirements.
Phone: 604-618-9821
Email: 21rebarltd@gmail.com
Service Area: Surrey & British Columbia
21 Rebar Ltd. — Strength beneath every structure.
Sources
Technical information in this article is based on Canadian reinforcing-bar references and CSA G30.18-related documentation.
Company information is based on 21 Rebar Ltd.’s website.