Metal Roofing: Cutting Metal Panels

The key to trimming metal panels properly is choosing the right tools. Below, find some helpful guidelines:

Avoid the use of a grinder (or other instruments that will spark).

Not only will the edge be rough and more susceptible to rust; the sparks can embed themselves in the paint and damage the finish. This can lead to premature corrosion and the voiding of the manufacturer warranty.

A pair of red and green off-set metal snips is indispensable. However, while their serration helps you make tight cuts and get purchase in tight areas, the serrated edge left behind is more susceptible to rust.

Best course is moderation.

Use red & green snips sparingly;

Opt for:

A pair of non-serrated metal snips (duckbill snips);

Or an electric nibbler where possible;

Put a hem where possible;

Extra barrier from the elements

Looks sharper / maintains color on edge

Different panel types call for different types of fasteners. For cutting the width, consider a concealed fastener. This is ideal for red and green snips and non-serrated metal snips. For cutting length, we recommend using an electric nibbler, pair of non-serrated metal snips and a brake to put them on a newly exposed edge.

Exposed fasteners call for a different approach. For cutting width or length, use a pair of non-serrated metal snips or an electric nibbler (if edge will be hidden).

David Mackey is a professional metal roofer by trade with 10,000+ hours of installation experience and president of Mackey Metal Roofing Inc. (MMR). The company, founded in 1999, operates North America's first 100 percent e-commerce platform for metal roofing panel accessible to the public. The Web site, /www.mackeymetalroofing.com, is a resource for contractors, building owners, home owners and architects looking to purchase panel, trim and accessories, as well as industry related products and tools such as paint, snow guards and power tools. Additionally, visitors can access MMR's library of industry related resources to assist them in making their roofing project a success.

David Mackey is the author of this article on Metal Panels. Find more information on Metal Roofing Panels here.