C Purlin vs Z Purlin: The Differences Explained

Have you ever wondered what makes modern construction so efficient and durable? This article explores the fascinating world of C-section and Z-section steel purlins, essential building materials that revolutionize construction. Learn how their unique properties and applications can enhance your next project!

Difference Between C Purlin And Z Purlin

Table Of Contents

As far as the construction site of relevant construction projects is concerned, at present, what everyone should know is about the use of building materials in the current construction market.

There is no doubt that the two most widely used building materials are actually Z-section steel purlin and C-section steel purlin.

The Difference Between C Purlin And Z Purlin

Two types of building materials, Z-section steel and C-section steel, have been developed and put into use in recent years, and Z-section steel and C-section steel have been widely used in the construction industry shortly after they were introduced because of their low carbon and durability.

In the field of the construction industry now involved, there is a very large amount of data on the use of steel in the specific construction process.

In addition, because the current Z-section steel purlin and C-section steel purlin have greatly replaced the status of some more traditional building materials in a certain sense, in fact, this has created a large number of Z-section steel and C-section steel to a certain extent.

Difference between C purlin and Z purlin

AspectC-Section Steel PurlinZ-Section Steel Purlin
Included Angle90 degrees60-75 degrees
Mechanical PropertiesDifferent strong and weak axis propertiesMore balanced mechanical properties
Connection to Steel FrameUsually screw connection; considered as simple supportOften preferred due to better stress distribution
Preferred Usage Based on Roof SlopePreferred for wall purlins and low-slope roofsPreferred for roofs with large slope
Section Modulus on Roof SlopeSlightly lower compared to Z-purlinIncreases symmetrically for larger slopes
Choice for WallsComparable to Z-purlinComparable to C-purlin
Continuous Structural MembersLess suitable for overlappingMore suitable due to ease of overlapping
Overall UsageWidely used in various applicationsPreferred in specific situations for its advantages

In order to understand the essential difference between C-section steel purlin and Z-section steel purlin, we need to have a corresponding understanding of C/Z section steel purlin

Next, I will tell you about C-section steel purlin and Z-section steel purlin respectively, and then analyze their essential differences according to the understanding of their use.

The angle between C-shaped steel purlin and Z-shaped steel purlin is different.

The included angle of C-shaped steel purlin is 90 degrees, and the included angle of Z-shaped steel purlin is less than 90 degrees, about 60-75 degrees.

Therefore, the included angle of purlin must be considered in the selection and combined with the corresponding stress knowledge.

Compared with Z purlin, the mechanical properties of the strong and weak axes of C purlin are very different

The connection between C-section steel and steel frame usually adopts screw connection, which must be considered as simple support in the calculation, so the latter is more reasonable in stress, calculation results and structure.

Therefore, in addition to other special processing needs such as door and window openings, Z-shaped steel section shall be preferred, and C-shaped steel shall be preferred for wall purlins and house purlins with small slope;

The roof purlin with large slope shall be Z-shaped.

What kind of purlin should be used in what environment? This is helpful for us to choose building materials.

1. When the roof slope is small, the section modulus of Z-shaped steel purlin is slightly higher than that of C-shaped steel purlin, but the difference is not significant;

When the roof slope increases, the modulus utilization of the Z-shaped steel purlin section increases symmetrically in the vertical direction.

Therefore, Z-shaped steel purlin is suitable for roofs with large slope.

2. For the wall, the choice of Z type and C type is not much different.

3. If purlins want to be continuous structural members, try to use Z-shaped steel purlins because they are easy to overlap.

What kind of environment and what kind of building materials are used in different environments?

The building materials they use play different roles, but C-purlin is still widely used in today’s life.

The above is an essential difference between C/Z steel purlins for everyone to understand.

C purlin

C-section steel is automatically processed and formed by C-section steel forming machine.

The machine can automatically complete the forming process according to the given size.

C-section steel is processed by hot coil cold bending, with thin wall, lightweight, excellent section performance and high strength.

Compared with traditional channel steel, the same strength can save 30% of materials.

C-section steel purlin

Application of C-section steel

C-section steel is widely used in purlins and wall beams of steel structure buildings, and can also be combined into lightweight roof truss, bracket and other building components.

In addition, it can also be used for columns, beams and arms in mechanical and light industrial manufacturing.

Processing flow of C purlin

Discharging ① – leveling ② – forming ③ – setting ④ – straightening ⑤ – length measurement ⑥ – punching the round hole of tie bar ⑦ – punching the elliptical connecting hole ⑧ – forming and cutting ⑨

C-section steel processing flow

Specification type

C-shaped steel purlins are divided into five specifications: 80, 100, 120, 140 and 160 according to different heights.

The length can be determined according to the engineering design, but considering the conditions such as transportation and installation, the total length is generally no more than 12m.

C purlin weight chart

Meaning of numbers in each line (take C80×40×20×2.5 as an example):

  • Section height h=80mm;
  • Section width b=40mm;
  • Crimping width c=20mm;
  • Thickness t=2.5mm;
C Channel Weight Chart
ModelSizes
(mm)
Cross-sectional area
(cm²)
Weight
(kg/m)
 hbct
C808040202.254.293.37
C808040202.504.753.72
C808040202.755.194.08
C808040203.005.644.42
C808050202.254.743.72
C808050202.505.254.12
C808050202.755.744.51
C808050203.006.244.89
C10010050202.255.194.08
C10010050202.505.754.51
C10010050202.756.294.94
C10010050203.006.845.36
C12012050202.255.644.43
C12012050202.506.254.90
C12012050202.756.845.37
C12012050203.007.445.84
C14014050202.256.094.78
C14014050202.506.755.29
C14014050202.757.395.80
C14014050203.008.036.31
C14014060202.256.545.13
C14014060202.507.255.69
C14014060202.757.946.23
C14014060203.008.646.78
C16016050202.256.545.13
C16016050202.507.255.69
C16016050202.757.946.23
C16016050203.008.646.78
C16016060202.256.995.49
C16016060202.507.756.08
C16016060202.758.496.67
C16016060203.009.247.25
C16016070202.257.445.84
C16016070202.508.256.47
C16016070202.759.047.10
C16016070203.009.847.72
C18018050202.256.995.49
C18018050202.507.756.08
C18018050202.758.496.67
C18018050203.009.247.25
C18018060202.257.445.84
C18018060202.508.256.47
C18018060202.759.047.10
C18018060203.009.847.72
C18018070202.257.896.19
C18018070202.508.756.86
C18018070202.759.597.53
C18018070203.0010.448.19
C18018080202.258.346.55
C18018080202.509.257.26
C18018080202.7510.147.96
C18018080203.0011.048.66
C20020050202.257.445.84
C20020050202.508.256.47
C20020050202.759.047.10
C20020050203.009.847.72
C20020060202.257.896.19
C20020060202.508.756.86
C20020060202.759.597.53
C20020060203.0010.448.19
C20020070202.258.346.55
C20020070202.509.257.26
C20020070202.7510.147.96
C20020070203.0011.048.66
C20020080202.258.796.90
C20020080202.509.757.65
C20020080202.7510.698.39
C20020080203.0011.649.13
C22022050202.257.896.19
C22022050202.508.756.86
C22022050202.759.597.53
C22022050203.0010.448.19
C22022060202.258.346.55
C22022060202.509.257.26
C22022060202.7510.147.96
C22022060203.0011.048.66
C22022070202.258.796.90
C22022070202.509.757.65
C22022070202.7510.698.39
C22022070203.0011.679.13
C22022080202.259.247.25
C22022080202.5010.258.04
C22022080202.7511.248.82
C22022080203.0012.249.60
C24024050202.258.346.55
C24024050202.509.257.26
C24024050202.7510.147.96
C24024050203.0011.048.66
C24024060202.258.796.90
C24024060202.509.757.65
C24024060202.7510.698.39
C24024060203.0011.649.13
C24024070202.259.247.25
C24024070202.5010.258.04
C24024070202.7511.248.82
C24024070203.0012.249.60
C24024080202.259.697.61
C24024080202.5010.758.43
C24024080202.7511.799.26
C24024080203.0012.8410.07
C25025050202.258.576.72
C25025050202.509.507.45
C25025050202.7510.428.18
C25025050203.0011.348.90
C25025060202.259.027.08
C25025060202.5010.007.85
C25025060202.7510.978.61
C25025060203.0011.949.37
C25025070202.259.477.43
C25025070202.5010.508.24
C25025070202.7511.529.04
C25025070203.0012.549.84
C25025075202.259.697.61
C25025075202.5010.758.43
C25025075202.7511.799.26
C25025075203.0012.8410.07
C25025080202.259.927.78
C25025080202.5011.008.63
C25025080202.7512.079.47
C25025080203.0013.1410.31

C purlin weight calculator

Z purlin

Z-section steel is a common cold-formed thin-walled section steel, with a thickness of 1.6-3.0mm and a section height of 120-350mm.

The processing materials are hot rolled (painted) and galvanized.

The processing standard shall be in accordance with GB50018-2002.

Z-section steel is usually used in large steel structure plants.

The processing length and hole are produced according to the processing requirements.

Z-section steel purlin

Applications of Z-section steel purlin

Cold-formed Z-shaped steel has the advantages of adjustable specification and size and large compressive strength.

It is widely used in automobile, railway vehicle, building doors and windows, transportation, shelf, electrical cabinet, highway guardrail, building steel structure, container, steel formwork and scaffold, solar support shipbuilding, bridge, power transmission tower, steel sheet pile, cable bridge, agricultural machinery, furniture, storage, guide rail, keel steel Vegetable greenhouses, pipe supports, municipal construction fields etc.

Z purlin weight chart

NoItemModelUnitWeight
1Cold Bend Z Section SteelZ80×40×2.5kg/m2.947
2Cold Bend Z Section SteelZ80×40×3.0kg/m3.491
3Cold Bend Z Section SteelZ100×50×2.5kg/m3.732
4Cold Bend Z Section SteelZ100×50×3.0kg/m4.432
5Cold Bend Z Purlin SteelZ100×40×20×2.0kg/m3.208
6Cold Bend Z Purlin SteelZ100×40×20×2.5kg/m3.932
7Cold Bend Z Purlin SteelZ120×50×20×2.0kg/m3.835
8Cold Bend Z Purlin SteelZ120×50×20×2.5kg/m4.718
9Cold Bend Z Purlin SteelZ120×50×20×3.0kg/m5.569
10Cold Bend Z Purlin SteelZ140×50×20×2.5kg/m5.11
11Cold Bend Z Purlin SteelZ140×50×20×3.0kg/m6.04
12Cold Bend Z Purlin SteelZ160×60×20×2.5kg/m5.895
13Cold Bend Z Purlin SteelZ160×60×20×3.0kg/m6.982
14Cold Bend Z Purlin SteelZ160×70×20×2.5kg/m6.288
15Cold Bend Z Purlin SteelZ160×70×20×3.0kg/m7.453
16Cold Bend Z Purlin SteelZ180×70×20×2.5kg/m6.679
17Cold Bend Z Purlin SteelZ180×70×20×3.0kg/m7.924
18Cold Bend Z Purlin SteelZ200×70×20×2.5kg/m7.073
19Cold Bend Z Purlin SteelZ200×70×20×3.0kg/m8.394
20Cold Bend Z Purlin SteelZ230×75×25×3.0kg/m9.573
21Cold Bend Z Purlin SteelZ230×75×25×4.0kg/m12.51
22Cold Bend Z Purlin SteelZ250×75×25×3.0kg/m10.04
23Cold Bend Z Purlin SteelZ250×75×25×4.0kg/m13.14

Z purlin weight calculator

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Shane
Author

Shane

Founder of MachineMFG

As the founder of MachineMFG, I have dedicated over a decade of my career to the metalworking industry. My extensive experience has allowed me to become an expert in the fields of sheet metal fabrication, machining, mechanical engineering, and machine tools for metals. I am constantly thinking, reading, and writing about these subjects, constantly striving to stay at the forefront of my field. Let my knowledge and expertise be an asset to your business.

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