Hanger Straps & Banding - Metal, Steel & More

Band iron and strapping are long, narrow rolls of perforated or plain metal strap used to hang, support, or secure pipe, duct, conduit, and other mechanical runs to building structure. Plumbers and HVAC installers use pre-punched perforated strapping to hang smaller pipe and light duct runs without drilling individual holes on site, while plain band iron gets custom-punched or wrapped around a run and screwed or bolted in place. Material choice, galvanized steel, stainless steel, or copper-coated strapping, depends on the environment and what the strap contacts, since dissimilar metals in direct contact can cause galvanic corrosion over time. Roll length and strap width both affect how much material a job needs, and installers commonly buy width to match the load rating required for the span between supports. Choosing strapping rated for the weight and span of the specific run keeps the hanger system from sagging or failing over the life of the installation.

Subcategories

• Perforated Strapping: Perforated strapping has evenly spaced pre-punched holes along its length, letting installers wrap and fasten it around pipe or duct without measuring and drilling individual holes. Plumbers use it most often for light-duty pipe hangers on copper, PEX, and small-diameter steel runs. Width and hole spacing vary by manufacturer, so matching strap width to the fastener size being used keeps the connection secure.
• Plain Band Iron: Plain band iron ships without pre-punched holes, giving installers control over exactly where fasteners go on a custom hanger or bracket. Sheet metal and mechanical contractors favor plain band iron for duct hanger straps and custom bracket fabrication where perforated spacing wouldn't line up with the specific job. Cutting and punching plain band iron on site takes more labor than using perforated strapping but allows a tighter, purpose-built fit.
• Stainless Steel and Coated Strapping: Stainless steel and coated strapping resist corrosion in damp basements, exterior runs, and environments with chemical exposure better than standard galvanized strapping. Contractors working in coastal areas, mechanical rooms with high humidity, or food-service environments often specify stainless strapping to meet corrosion-resistance requirements. Coated strapping options also help avoid galvanic corrosion when in direct contact with dissimilar pipe materials such as copper.

Buying Guide

Start by identifying what the strapping needs to support, pipe, duct, or conduit, since the load and span between supports determines the strap width and gauge needed. A wider or heavier-gauge strap handles a longer span or heavier line without sagging, while lighter perforated strapping is enough for short-span, lightweight pipe runs like PEX or small copper.

Next, consider the material the strapping will contact directly. Copper pipe in direct contact with plain galvanized steel strapping can set up galvanic corrosion over time in damp environments, so many contractors use copper-coated or plastic-coated strapping specifically for copper runs, reserving galvanized strapping for steel or cast iron.

Band Iron and Strapping also come in different roll lengths, and buying a length close to the total run needed reduces waste from cut-off scrap on longer jobs. For jobs with many short hanger runs, perforated strapping in shorter, pre-cut lengths can be more efficient than working from a long roll.

Finally, check local code requirements for hanger spacing and strap type by pipe material and diameter, since some jurisdictions specify minimum strap width or material type for certain pipe sizes. Confirming code requirements before purchasing keeps the finished installation from failing an inspection over a hanger detail.

Frequently Asked Questions

What's the difference between band iron and perforated strapping?

Band iron ships as plain metal strap without pre-punched holes, while perforated strapping has evenly spaced holes already punched along its length. Perforated strapping installs faster for standard hanger applications, while plain band iron gives more control for custom brackets and duct hanger fabrication.

Can galvanized strapping be used directly on copper pipe?

Direct contact between galvanized steel strapping and copper pipe can lead to galvanic corrosion over time, especially in damp locations. Copper-coated or plastic-coated strapping, or a non-metallic isolation layer between the strap and pipe, avoids that corrosion risk on copper runs.

How do I know what width strapping I need for a pipe hanger?

Strap width and gauge depend on the weight and span of the pipe or duct run being supported, with longer spans and heavier lines needing wider or heavier-gauge strapping. Local code often specifies a minimum strap width or hanger spacing by pipe size, so checking the code requirement for the specific run is the safest way to confirm width.

Is stainless steel strapping necessary for every job?

No. Stainless steel strapping is typically specified for damp, corrosive, or food-service environments where standard galvanized strapping would corrode faster than expected. Interior, dry mechanical spaces with standard pipe materials usually work fine with standard galvanized perforated strapping.

Does strapping need to meet a specific code requirement?

Many jurisdictions specify minimum hanger spacing and acceptable strap types by pipe material and diameter in the local plumbing or mechanical code. Confirming the applicable code section before purchasing and installing strapping keeps the job from failing inspection over hanger spacing or material.