C-Section Channels Explained: Uses, Sizes & Buying Tips

If you’re building a new home, planning an extension, or undertaking a DIY renovation, you’ll most likely need structural steel products. The C-section channel, also known as parallel flange channel (PFC), is one of the most versatile and widely used structural steel profiles.

From supporting brick walls to acting as the backbone of roof structures, these C-shaped steel beams do a lot of heavy lifting in Australian construction.

In this article, we unpack everything you need to know about C-section channels, from what they are and where they’re used, to understanding sizing and specifications, so you can buy them with confidence.

What is a C-section channel?

A C-section channel is a common type of structural steel profile shaped like the letter “C” when viewed in cross-section. It features a vertical web and two horizontal flanges (or protruded ridges at top and bottom), making it ideal for structural applications where a flat back and open face are needed.

Unlike universal beams (which have flanges on both sides), C-section channels have a flat surface that makes them easy to mount against walls, concrete, or other framing materials.

Common Uses of C Section Channels

C-section channels are widely used in construction applications because of their strength, versatility, and ease of use. Here’s where you’ll often see them used:

Wall and frame bracing: C-sections are often used in stud and purlin framing systems, especially for steel-framed homes, garages, sheds, and industrial buildings. They are favoured for their strength-to-weight ratio, which means they are lightweight but strong enough to support roof and wall loads. The flat face on one side makes it ideal to have a face finish on the outside of your building.

Lintels Over Doors and Windows: Structural steel C-section channels are an excellent choice for supporting weight above wall openings, such as doors and windows. Lintel beams will need special consideration to ensure you comply with the National Construction Code, which has recently been updated.

Understanding Sizes & Specifications

When selecting a C-section channel, it’s crucial to understand industry sizing and specifications.

In Australia, most PFC sizing and specifications will use the depth of section (vertical web).

For example, a typical designation might look like: 150PFC.

This means:

150 mm = Depth of the section (vertical web)

75 mm = Width of the flange (horizontal top and bottom edges)

17.7 kg/m = Mass per metre of length

Buying Tips for Builders, Tradies & DIYers

If you are planning a project that requires C-section channels, you must consider several factors before placing an order.

Firstly, make sure you know your load requirements. Is your channel bearing a heavy structural load (like a lintel) or acting as a lightweight support frame (like a pergola roof)? This affects the depth, weight, and steel grade you’ll need. Speak with an engineer or builder if you’re unsure.

Secondly, the environment and exposure to the elements will drastically affect your choice. If your project is outdoor or coastal, you’ll need hot dip galvanised steel. If your structural steel will be visible, whether in an exposed roof structure or pergola, make sure you consider how you would like to finish or paint it. If you do, this will affect your product choice and surface preparation techniques.

Buy C-section channel online from Edcon Steel

At Edcon Steel, we pride ourselves on the expertise of our staff, our level of customer service and the depth of our local market knowledge. You can visit our stores to browse the range or pick up an online order.

Our staff are on hand to answer any questions you have about our full range of products and services, so feel free to contact us for your steel or metal solution today.